[gnome-commander] Adds some m4 macros which are not always distributed in a build environment
- From: Uwe Scholz <uwescholz src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-commander] Adds some m4 macros which are not always distributed in a build environment
- Date: Tue, 19 Sep 2017 20:41:05 +0000 (UTC)
commit 8c553c8b695dc94ac02936ee3946dc60014abe2d
Author: Uwe Scholz <uwescholz src gnome org>
Date: Tue Sep 19 21:30:55 2017 +0200
Adds some m4 macros which are not always distributed in a build environment
m4/ax_append_compile_flags.m4 | 67 +++
m4/ax_append_flag.m4 | 71 +++
m4/ax_append_link_flags.m4 | 65 +++
m4/ax_check_compile_flag.m4 | 74 +++
m4/ax_check_link_flag.m4 | 74 +++
m4/ax_compiler_flags.m4 | 158 ++++++
m4/ax_compiler_flags_cflags.m4 | 140 ++++++
m4/ax_compiler_flags_cxxflags.m4 | 136 ++++++
m4/ax_compiler_flags_gir.m4 | 60 +++
m4/ax_compiler_flags_ldflags.m4 | 92 ++++
m4/ax_cxx_compile_stdcxx.m4 | 982 ++++++++++++++++++++++++++++++++++++++
m4/ax_cxx_compile_stdcxx_11.m4 | 39 ++
m4/ax_is_release.m4 | 80 +++
m4/ax_require_defined.m4 | 37 ++
m4/gsettings.m4 | 83 ++++
m4/pkg.m4 | 275 +++++++++++
m4/yelp.m4 | 213 ++++++++
17 files changed, 2646 insertions(+), 0 deletions(-)
---
diff --git a/m4/ax_append_compile_flags.m4 b/m4/ax_append_compile_flags.m4
new file mode 100644
index 0000000..5b6f1af
--- /dev/null
+++ b/m4/ax_append_compile_flags.m4
@@ -0,0 +1,67 @@
+# ============================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_append_compile_flags.html
+# ============================================================================
+#
+# SYNOPSIS
+#
+# AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+# For every FLAG1, FLAG2 it is checked whether the compiler works with the
+# flag. If it does, the flag is added FLAGS-VARIABLE
+#
+# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
+# CFLAGS) is used. During the check the flag is always added to the
+# current language's flags.
+#
+# If EXTRA-FLAGS is defined, it is added to the current language's default
+# flags (e.g. CFLAGS) when the check is done. The check is thus made with
+# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
+# force the compiler to issue an error when a bad flag is given.
+#
+# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+# NOTE: This macro depends on the AX_APPEND_FLAG and
+# AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
+# AX_APPEND_LINK_FLAGS.
+#
+# LICENSE
+#
+# Copyright (c) 2011 Maarten Bosmans <mkbosmans gmail com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 6
+
+AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
+[AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
+AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
+for flag in $1; do
+ AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
+done
+])dnl AX_APPEND_COMPILE_FLAGS
diff --git a/m4/ax_append_flag.m4 b/m4/ax_append_flag.m4
new file mode 100644
index 0000000..e8c5312
--- /dev/null
+++ b/m4/ax_append_flag.m4
@@ -0,0 +1,71 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_append_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
+#
+# DESCRIPTION
+#
+# FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
+# added in between.
+#
+# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
+# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
+# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
+# FLAG.
+#
+# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Guido U. Draheim <guidod gmx de>
+# Copyright (c) 2011 Maarten Bosmans <mkbosmans gmail com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 7
+
+AC_DEFUN([AX_APPEND_FLAG],
+[dnl
+AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
+AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
+AS_VAR_SET_IF(FLAGS,[
+ AS_CASE([" AS_VAR_GET(FLAGS) "],
+ [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
+ [
+ AS_VAR_APPEND(FLAGS,[" $1"])
+ AC_RUN_LOG([: FLAGS="$FLAGS"])
+ ])
+ ],
+ [
+ AS_VAR_SET(FLAGS,[$1])
+ AC_RUN_LOG([: FLAGS="$FLAGS"])
+ ])
+AS_VAR_POPDEF([FLAGS])dnl
+])dnl AX_APPEND_FLAG
diff --git a/m4/ax_append_link_flags.m4 b/m4/ax_append_link_flags.m4
new file mode 100644
index 0000000..6f7f174
--- /dev/null
+++ b/m4/ax_append_link_flags.m4
@@ -0,0 +1,65 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_append_link_flags.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+# For every FLAG1, FLAG2 it is checked whether the linker works with the
+# flag. If it does, the flag is added FLAGS-VARIABLE
+#
+# If FLAGS-VARIABLE is not specified, the linker's flags (LDFLAGS) is
+# used. During the check the flag is always added to the linker's flags.
+#
+# If EXTRA-FLAGS is defined, it is added to the linker's default flags
+# when the check is done. The check is thus made with the flags: "LDFLAGS
+# EXTRA-FLAGS FLAG". This can for example be used to force the linker to
+# issue an error when a bad flag is given.
+#
+# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+# NOTE: This macro depends on the AX_APPEND_FLAG and AX_CHECK_LINK_FLAG.
+# Please keep this macro in sync with AX_APPEND_COMPILE_FLAGS.
+#
+# LICENSE
+#
+# Copyright (c) 2011 Maarten Bosmans <mkbosmans gmail com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 6
+
+AC_DEFUN([AX_APPEND_LINK_FLAGS],
+[AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
+AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
+for flag in $1; do
+ AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
+done
+])dnl AX_APPEND_LINK_FLAGS
diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
new file mode 100644
index 0000000..dcabb92
--- /dev/null
+++ b/m4/ax_check_compile_flag.m4
@@ -0,0 +1,74 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+# Check whether the given FLAG works with the current language's compiler
+# or gives an error. (Warnings, however, are ignored)
+#
+# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+# success/failure.
+#
+# If EXTRA-FLAGS is defined, it is added to the current language's default
+# flags (e.g. CFLAGS) when the check is done. The check is thus made with
+# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
+# force the compiler to issue an error when a bad flag is given.
+#
+# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Guido U. Draheim <guidod gmx de>
+# Copyright (c) 2011 Maarten Bosmans <mkbosmans gmail com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 5
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+ ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+ _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+ AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
+ [AS_VAR_SET(CACHEVAR,[yes])],
+ [AS_VAR_SET(CACHEVAR,[no])])
+ _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_VAR_IF(CACHEVAR,yes,
+ [m4_default([$2], :)],
+ [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS
diff --git a/m4/ax_check_link_flag.m4 b/m4/ax_check_link_flag.m4
new file mode 100644
index 0000000..819409a
--- /dev/null
+++ b/m4/ax_check_link_flag.m4
@@ -0,0 +1,74 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+# Check whether the given FLAG works with the linker or gives an error.
+# (Warnings, however, are ignored)
+#
+# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+# success/failure.
+#
+# If EXTRA-FLAGS is defined, it is added to the linker's default flags
+# when the check is done. The check is thus made with the flags: "LDFLAGS
+# EXTRA-FLAGS FLAG". This can for example be used to force the linker to
+# issue an error when a bad flag is given.
+#
+# INPUT gives an alternative input source to AC_LINK_IFELSE.
+#
+# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+# macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Guido U. Draheim <guidod gmx de>
+# Copyright (c) 2011 Maarten Bosmans <mkbosmans gmail com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 5
+
+AC_DEFUN([AX_CHECK_LINK_FLAG],
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
+AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
+ ax_check_save_flags=$LDFLAGS
+ LDFLAGS="$LDFLAGS $4 $1"
+ AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
+ [AS_VAR_SET(CACHEVAR,[yes])],
+ [AS_VAR_SET(CACHEVAR,[no])])
+ LDFLAGS=$ax_check_save_flags])
+AS_VAR_IF(CACHEVAR,yes,
+ [m4_default([$2], :)],
+ [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_LINK_FLAGS
diff --git a/m4/ax_compiler_flags.m4 b/m4/ax_compiler_flags.m4
new file mode 100644
index 0000000..ddb0456
--- /dev/null
+++ b/m4/ax_compiler_flags.m4
@@ -0,0 +1,158 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_COMPILER_FLAGS([CFLAGS-VARIABLE], [LDFLAGS-VARIABLE], [IS-RELEASE], [EXTRA-BASE-CFLAGS],
[EXTRA-YES-CFLAGS], [UNUSED], [UNUSED], [UNUSED], [EXTRA-BASE-LDFLAGS], [EXTRA-YES-LDFLAGS], [UNUSED],
[UNUSED], [UNUSED])
+#
+# DESCRIPTION
+#
+# Check for the presence of an --enable-compile-warnings option to
+# configure, defaulting to "error" in normal operation, or "yes" if
+# IS-RELEASE is equal to "yes". Return the value in the variable
+# $ax_enable_compile_warnings.
+#
+# Depending on the value of --enable-compile-warnings, different compiler
+# warnings are checked to see if they work with the current compiler and,
+# if so, are appended to CFLAGS-VARIABLE and LDFLAGS-VARIABLE. This
+# allows a consistent set of baseline compiler warnings to be used across
+# a code base, irrespective of any warnings enabled locally by individual
+# developers. By standardising the warnings used by all developers of a
+# project, the project can commit to a zero-warnings policy, using -Werror
+# to prevent compilation if new warnings are introduced. This makes
+# catching bugs which are flagged by warnings a lot easier.
+#
+# By providing a consistent --enable-compile-warnings argument across all
+# projects using this macro, continuous integration systems can easily be
+# configured the same for all projects. Automated systems or build
+# systems aimed at beginners may want to pass the --disable-Werror
+# argument to unconditionally prevent warnings being fatal.
+#
+# --enable-compile-warnings can take the values:
+#
+# * no: Base compiler warnings only; not even -Wall.
+# * yes: The above, plus a broad range of useful warnings.
+# * error: The above, plus -Werror so that all warnings are fatal.
+# Use --disable-Werror to override this and disable fatal
+# warnings.
+#
+# The set of base and enabled flags can be augmented using the
+# EXTRA-*-CFLAGS and EXTRA-*-LDFLAGS variables, which are tested and
+# appended to the output variable if --enable-compile-warnings is not
+# "no". Flags should not be disabled using these arguments, as the entire
+# point of AX_COMPILER_FLAGS is to enforce a consistent set of useful
+# compiler warnings on code, using warnings which have been chosen for low
+# false positive rates. If a compiler emits false positives for a
+# warning, a #pragma should be used in the code to disable the warning
+# locally. See:
+#
+# https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Diagnostic-Pragmas.html#Diagnostic-Pragmas
+#
+# The EXTRA-* variables should only be used to supply extra warning flags,
+# and not general purpose compiler flags, as they are controlled by
+# configure options such as --disable-Werror.
+#
+# IS-RELEASE can be used to disable -Werror when making a release, which
+# is useful for those hairy moments when you just want to get the release
+# done as quickly as possible. Set it to "yes" to disable -Werror. By
+# default, it uses the value of $ax_is_release, so if you are using the
+# AX_IS_RELEASE macro, there is no need to pass this parameter. For
+# example:
+#
+# AX_IS_RELEASE([git-directory])
+# AX_COMPILER_FLAGS()
+#
+# CFLAGS-VARIABLE defaults to WARN_CFLAGS, and LDFLAGS-VARIABLE defaults
+# to WARN_LDFLAGS. Both variables are AC_SUBST-ed by this macro, but must
+# be manually added to the CFLAGS and LDFLAGS variables for each target in
+# the code base.
+#
+# If C++ language support is enabled with AC_PROG_CXX, which must occur
+# before this macro in configure.ac, warning flags for the C++ compiler
+# are AC_SUBST-ed as WARN_CXXFLAGS, and must be manually added to the
+# CXXFLAGS variables for each target in the code base. EXTRA-*-CFLAGS can
+# be used to augment the base and enabled flags.
+#
+# Warning flags for g-ir-scanner (from GObject Introspection) are
+# AC_SUBST-ed as WARN_SCANNERFLAGS. This variable must be manually added
+# to the SCANNERFLAGS variable for each GIR target in the code base. If
+# extra g-ir-scanner flags need to be enabled, the AX_COMPILER_FLAGS_GIR
+# macro must be invoked manually.
+#
+# AX_COMPILER_FLAGS may add support for other tools in future, in addition
+# to the compiler and linker. No extra EXTRA-* variables will be added
+# for those tools, and all extra support will still use the single
+# --enable-compile-warnings configure option. For finer grained control
+# over the flags for individual tools, use AX_COMPILER_FLAGS_CFLAGS,
+# AX_COMPILER_FLAGS_LDFLAGS and AX_COMPILER_FLAGS_* for new tools.
+#
+# The UNUSED variables date from a previous version of this macro, and are
+# automatically appended to the preceding non-UNUSED variable. They should
+# be left empty in new uses of the macro.
+#
+# LICENSE
+#
+# Copyright (c) 2014, 2015 Philip Withnall <philip tecnocode co uk>
+# Copyright (c) 2015 David King <amigadave amigadave com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 14
+
+# _AX_COMPILER_FLAGS_LANG([LANGNAME])
+m4_defun([_AX_COMPILER_FLAGS_LANG],
+[m4_ifdef([_AX_COMPILER_FLAGS_LANG_]$1[_enabled], [],
+ [m4_define([_AX_COMPILER_FLAGS_LANG_]$1[_enabled], [])dnl
+ AX_REQUIRE_DEFINED([AX_COMPILER_FLAGS_]$1[FLAGS])])dnl
+])
+
+AC_DEFUN([AX_COMPILER_FLAGS],[
+ # C support is enabled by default.
+ _AX_COMPILER_FLAGS_LANG([C])
+ # Only enable C++ support if AC_PROG_CXX is called. The redefinition of
+ # AC_PROG_CXX is so that a fatal error is emitted if this macro is called
+ # before AC_PROG_CXX, which would otherwise cause no C++ warnings to be
+ # checked.
+ AC_PROVIDE_IFELSE([AC_PROG_CXX],
+ [_AX_COMPILER_FLAGS_LANG([CXX])],
+ [m4_define([AC_PROG_CXX], defn([AC_PROG_CXX])[_AX_COMPILER_FLAGS_LANG([CXX])])])
+ AX_REQUIRE_DEFINED([AX_COMPILER_FLAGS_LDFLAGS])
+
+ # Default value for IS-RELEASE is $ax_is_release
+ ax_compiler_flags_is_release=m4_tolower(m4_normalize(ifelse([$3],,
+ [$ax_is_release],
+ [$3])))
+
+ AC_ARG_ENABLE([compile-warnings],
+ AS_HELP_STRING([--enable-compile-warnings=@<:@no/yes/error@:>@],
+ [Enable compiler warnings and errors]),,
+ [AS_IF([test "$ax_compiler_flags_is_release" = "yes"],
+ [enable_compile_warnings="yes"],
+ [enable_compile_warnings="error"])])
+ AC_ARG_ENABLE([Werror],
+ AS_HELP_STRING([--disable-Werror],
+ [Unconditionally make all compiler warnings non-fatal]),,
+ [enable_Werror=maybe])
+
+ # Return the user's chosen warning level
+ AS_IF([test "$enable_Werror" = "no" -a \
+ "$enable_compile_warnings" = "error"],[
+ enable_compile_warnings="yes"
+ ])
+
+ ax_enable_compile_warnings=$enable_compile_warnings
+
+ AX_COMPILER_FLAGS_CFLAGS([$1],[$ax_compiler_flags_is_release],
+ [$4],[$5 $6 $7 $8])
+ m4_ifdef([_AX_COMPILER_FLAGS_LANG_CXX_enabled],
+ [AX_COMPILER_FLAGS_CXXFLAGS([WARN_CXXFLAGS],
+ [$ax_compiler_flags_is_release],
+ [$4],[$5 $6 $7 $8])])
+ AX_COMPILER_FLAGS_LDFLAGS([$2],[$ax_compiler_flags_is_release],
+ [$9],[$10 $11 $12 $13])
+ AX_COMPILER_FLAGS_GIR([WARN_SCANNERFLAGS],[$ax_compiler_flags_is_release])
+])dnl AX_COMPILER_FLAGS
diff --git a/m4/ax_compiler_flags_cflags.m4 b/m4/ax_compiler_flags_cflags.m4
new file mode 100644
index 0000000..aeb16e3
--- /dev/null
+++ b/m4/ax_compiler_flags_cflags.m4
@@ -0,0 +1,140 @@
+# =============================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cflags.html
+# =============================================================================
+#
+# SYNOPSIS
+#
+# AX_COMPILER_FLAGS_CFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
+#
+# DESCRIPTION
+#
+# Add warning flags for the C compiler to VARIABLE, which defaults to
+# WARN_CFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be
+# manually added to the CFLAGS variable for each target in the code base.
+#
+# This macro depends on the environment set up by AX_COMPILER_FLAGS.
+# Specifically, it uses the value of $ax_enable_compile_warnings to decide
+# which flags to enable.
+#
+# LICENSE
+#
+# Copyright (c) 2014, 2015 Philip Withnall <philip tecnocode co uk>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 14
+
+AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[
+ AC_REQUIRE([AC_PROG_SED])
+ AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
+ AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
+ AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
+
+ # Variable names
+ m4_define([ax_warn_cflags_variable],
+ [m4_normalize(ifelse([$1],,[WARN_CFLAGS],[$1]))])
+
+ AC_LANG_PUSH([C])
+
+ # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
+ # flags, otherwise they are always appended to the warn_cflags variable, and
+ # Clang warns on them for every compilation unit.
+ # If this is passed to GCC, it will explode, so the flag must be enabled
+ # conditionally.
+ AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
+ ax_compiler_flags_test="-Werror=unknown-warning-option"
+ ],[
+ ax_compiler_flags_test=""
+ ])
+
+ # Check that -Wno-suggest-attribute=format is supported
+ AX_CHECK_COMPILE_FLAG([-Wno-suggest-attribute=format],[
+ ax_compiler_no_suggest_attribute_flags="-Wno-suggest-attribute=format"
+ ],[
+ ax_compiler_no_suggest_attribute_flags=""
+ ])
+
+ # Base flags
+ AX_APPEND_COMPILE_FLAGS([ dnl
+ -fno-strict-aliasing dnl
+ $3 dnl
+ ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
+
+ AS_IF([test "$ax_enable_compile_warnings" != "no"],[
+ # "yes" flags
+ AX_APPEND_COMPILE_FLAGS([ dnl
+ -Wall dnl
+ -Wextra dnl
+ -Wundef dnl
+ -Wnested-externs dnl
+ -Wwrite-strings dnl
+ -Wpointer-arith dnl
+ -Wmissing-declarations dnl
+ -Wmissing-prototypes dnl
+ -Wstrict-prototypes dnl
+ -Wredundant-decls dnl
+ -Wno-unused-parameter dnl
+ -Wno-missing-field-initializers dnl
+ -Wdeclaration-after-statement dnl
+ -Wformat=2 dnl
+ -Wold-style-definition dnl
+ -Wcast-align dnl
+ -Wformat-nonliteral dnl
+ -Wformat-security dnl
+ -Wsign-compare dnl
+ -Wstrict-aliasing dnl
+ -Wshadow dnl
+ -Winline dnl
+ -Wpacked dnl
+ -Wmissing-format-attribute dnl
+ -Wmissing-noreturn dnl
+ -Winit-self dnl
+ -Wredundant-decls dnl
+ -Wmissing-include-dirs dnl
+ -Wunused-but-set-variable dnl
+ -Warray-bounds dnl
+ -Wimplicit-function-declaration dnl
+ -Wreturn-type dnl
+ -Wswitch-enum dnl
+ -Wswitch-default dnl
+ $4 dnl
+ $5 dnl
+ $6 dnl
+ $7 dnl
+ ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
+ ])
+ AS_IF([test "$ax_enable_compile_warnings" = "error"],[
+ # "error" flags; -Werror has to be appended unconditionally because
+ # it's not possible to test for
+ #
+ # suggest-attribute=format is disabled because it gives too many false
+ # positives
+ AX_APPEND_FLAG([-Werror],ax_warn_cflags_variable)
+
+ AX_APPEND_COMPILE_FLAGS([ dnl
+ [$ax_compiler_no_suggest_attribute_flags] dnl
+ ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
+ ])
+
+ # In the flags below, when disabling specific flags, always add *both*
+ # -Wno-foo and -Wno-error=foo. This fixes the situation where (for example)
+ # we enable -Werror, disable a flag, and a build bot passes CFLAGS=-Wall,
+ # which effectively turns that flag back on again as an error.
+ for flag in $ax_warn_cflags_variable; do
+ AS_CASE([$flag],
+ [-Wno-*=*],[],
+ [-Wno-*],[
+ AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')],
+ ax_warn_cflags_variable,
+ [$ax_compiler_flags_test])
+ ])
+ done
+
+ AC_LANG_POP([C])
+
+ # Substitute the variables
+ AC_SUBST(ax_warn_cflags_variable)
+])dnl AX_COMPILER_FLAGS
diff --git a/m4/ax_compiler_flags_cxxflags.m4 b/m4/ax_compiler_flags_cxxflags.m4
new file mode 100644
index 0000000..3067d9b
--- /dev/null
+++ b/m4/ax_compiler_flags_cxxflags.m4
@@ -0,0 +1,136 @@
+# ===============================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cxxflags.html
+# ===============================================================================
+#
+# SYNOPSIS
+#
+# AX_COMPILER_FLAGS_CXXFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
+#
+# DESCRIPTION
+#
+# Add warning flags for the C++ compiler to VARIABLE, which defaults to
+# WARN_CXXFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be
+# manually added to the CXXFLAGS variable for each target in the code
+# base.
+#
+# This macro depends on the environment set up by AX_COMPILER_FLAGS.
+# Specifically, it uses the value of $ax_enable_compile_warnings to decide
+# which flags to enable.
+#
+# LICENSE
+#
+# Copyright (c) 2015 David King <amigadave amigadave com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 10
+
+AC_DEFUN([AX_COMPILER_FLAGS_CXXFLAGS],[
+ AC_REQUIRE([AC_PROG_SED])
+ AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
+ AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
+ AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
+
+ # Variable names
+ m4_define([ax_warn_cxxflags_variable],
+ [m4_normalize(ifelse([$1],,[WARN_CXXFLAGS],[$1]))])
+
+ AC_LANG_PUSH([C++])
+
+ # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
+ # flags, otherwise they are always appended to the warn_cxxflags variable,
+ # and Clang warns on them for every compilation unit.
+ # If this is passed to GCC, it will explode, so the flag must be enabled
+ # conditionally.
+ AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
+ ax_compiler_flags_test="-Werror=unknown-warning-option"
+ ],[
+ ax_compiler_flags_test=""
+ ])
+
+ # Check that -Wno-suggest-attribute=format is supported
+ AX_CHECK_COMPILE_FLAG([-Wno-suggest-attribute=format],[
+ ax_compiler_no_suggest_attribute_flags="-Wno-suggest-attribute=format"
+ ],[
+ ax_compiler_no_suggest_attribute_flags=""
+ ])
+
+ # Base flags
+ AX_APPEND_COMPILE_FLAGS([ dnl
+ -fno-strict-aliasing dnl
+ $3 dnl
+ ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])
+
+ AS_IF([test "$ax_enable_compile_warnings" != "no"],[
+ # "yes" flags
+ AX_APPEND_COMPILE_FLAGS([ dnl
+ -Wall dnl
+ -Wextra dnl
+ -Wundef dnl
+ -Wwrite-strings dnl
+ -Wpointer-arith dnl
+ -Wmissing-declarations dnl
+ -Wredundant-decls dnl
+ -Wno-unused-parameter dnl
+ -Wno-missing-field-initializers dnl
+ -Wformat=2 dnl
+ -Wcast-align dnl
+ -Wformat-nonliteral dnl
+ -Wformat-security dnl
+ -Wsign-compare dnl
+ -Wstrict-aliasing dnl
+ -Wshadow dnl
+ -Winline dnl
+ -Wpacked dnl
+ -Wmissing-format-attribute dnl
+ -Wmissing-noreturn dnl
+ -Winit-self dnl
+ -Wredundant-decls dnl
+ -Wmissing-include-dirs dnl
+ -Wunused-but-set-variable dnl
+ -Warray-bounds dnl
+ -Wreturn-type dnl
+ -Wno-overloaded-virtual dnl
+ -Wswitch-enum dnl
+ -Wswitch-default dnl
+ $4 dnl
+ $5 dnl
+ $6 dnl
+ $7 dnl
+ ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])
+ ])
+ AS_IF([test "$ax_enable_compile_warnings" = "error"],[
+ # "error" flags; -Werror has to be appended unconditionally because
+ # it's not possible to test for
+ #
+ # suggest-attribute=format is disabled because it gives too many false
+ # positives
+ AX_APPEND_FLAG([-Werror],ax_warn_cxxflags_variable)
+
+ AX_APPEND_COMPILE_FLAGS([ dnl
+ [$ax_compiler_no_suggest_attribute_flags] dnl
+ ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])
+ ])
+
+ # In the flags below, when disabling specific flags, always add *both*
+ # -Wno-foo and -Wno-error=foo. This fixes the situation where (for example)
+ # we enable -Werror, disable a flag, and a build bot passes CXXFLAGS=-Wall,
+ # which effectively turns that flag back on again as an error.
+ for flag in $ax_warn_cxxflags_variable; do
+ AS_CASE([$flag],
+ [-Wno-*=*],[],
+ [-Wno-*],[
+ AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')],
+ ax_warn_cxxflags_variable,
+ [$ax_compiler_flags_test])
+ ])
+ done
+
+ AC_LANG_POP([C++])
+
+ # Substitute the variables
+ AC_SUBST(ax_warn_cxxflags_variable)
+])dnl AX_COMPILER_FLAGS_CXXFLAGS
diff --git a/m4/ax_compiler_flags_gir.m4 b/m4/ax_compiler_flags_gir.m4
new file mode 100644
index 0000000..5b4924a
--- /dev/null
+++ b/m4/ax_compiler_flags_gir.m4
@@ -0,0 +1,60 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_gir.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_COMPILER_FLAGS_GIR([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
+#
+# DESCRIPTION
+#
+# Add warning flags for the g-ir-scanner (from GObject Introspection) to
+# VARIABLE, which defaults to WARN_SCANNERFLAGS. VARIABLE is AC_SUBST-ed
+# by this macro, but must be manually added to the SCANNERFLAGS variable
+# for each GIR target in the code base.
+#
+# This macro depends on the environment set up by AX_COMPILER_FLAGS.
+# Specifically, it uses the value of $ax_enable_compile_warnings to decide
+# which flags to enable.
+#
+# LICENSE
+#
+# Copyright (c) 2015 Philip Withnall <philip tecnocode co uk>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 6
+
+AC_DEFUN([AX_COMPILER_FLAGS_GIR],[
+ AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
+
+ # Variable names
+ m4_define([ax_warn_scannerflags_variable],
+ [m4_normalize(ifelse([$1],,[WARN_SCANNERFLAGS],[$1]))])
+
+ # Base flags
+ AX_APPEND_FLAG([$3],ax_warn_scannerflags_variable)
+
+ AS_IF([test "$ax_enable_compile_warnings" != "no"],[
+ # "yes" flags
+ AX_APPEND_FLAG([ dnl
+ --warn-all dnl
+ $4 dnl
+ $5 dnl
+ $6 dnl
+ $7 dnl
+ ],ax_warn_scannerflags_variable)
+ ])
+ AS_IF([test "$ax_enable_compile_warnings" = "error"],[
+ # "error" flags
+ AX_APPEND_FLAG([ dnl
+ --warn-error dnl
+ ],ax_warn_scannerflags_variable)
+ ])
+
+ # Substitute the variables
+ AC_SUBST(ax_warn_scannerflags_variable)
+])dnl AX_COMPILER_FLAGS
diff --git a/m4/ax_compiler_flags_ldflags.m4 b/m4/ax_compiler_flags_ldflags.m4
new file mode 100644
index 0000000..842e329
--- /dev/null
+++ b/m4/ax_compiler_flags_ldflags.m4
@@ -0,0 +1,92 @@
+# ==============================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_ldflags.html
+# ==============================================================================
+#
+# SYNOPSIS
+#
+# AX_COMPILER_FLAGS_LDFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
+#
+# DESCRIPTION
+#
+# Add warning flags for the linker to VARIABLE, which defaults to
+# WARN_LDFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be
+# manually added to the LDFLAGS variable for each target in the code base.
+#
+# This macro depends on the environment set up by AX_COMPILER_FLAGS.
+# Specifically, it uses the value of $ax_enable_compile_warnings to decide
+# which flags to enable.
+#
+# LICENSE
+#
+# Copyright (c) 2014, 2015 Philip Withnall <philip tecnocode co uk>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 8
+
+AC_DEFUN([AX_COMPILER_FLAGS_LDFLAGS],[
+ AX_REQUIRE_DEFINED([AX_APPEND_LINK_FLAGS])
+ AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
+ AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
+ AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
+
+ # Variable names
+ m4_define([ax_warn_ldflags_variable],
+ [m4_normalize(ifelse([$1],,[WARN_LDFLAGS],[$1]))])
+
+ # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
+ # flags, otherwise they are always appended to the warn_ldflags variable,
+ # and Clang warns on them for every compilation unit.
+ # If this is passed to GCC, it will explode, so the flag must be enabled
+ # conditionally.
+ AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
+ ax_compiler_flags_test="-Werror=unknown-warning-option"
+ ],[
+ ax_compiler_flags_test=""
+ ])
+
+ # macOS linker does not have --as-needed
+ AX_CHECK_LINK_FLAG([-Wl,--no-as-needed], [
+ ax_compiler_flags_as_needed_option="-Wl,--no-as-needed"
+ ], [
+ ax_compiler_flags_as_needed_option=""
+ ])
+
+ # macOS linker speaks with a different accent
+ ax_compiler_flags_fatal_warnings_option=""
+ AX_CHECK_LINK_FLAG([-Wl,--fatal-warnings], [
+ ax_compiler_flags_fatal_warnings_option="-Wl,--fatal-warnings"
+ ])
+ AX_CHECK_LINK_FLAG([-Wl,-fatal_warnings], [
+ ax_compiler_flags_fatal_warnings_option="-Wl,-fatal_warnings"
+ ])
+
+ # Base flags
+ AX_APPEND_LINK_FLAGS([ dnl
+ $ax_compiler_flags_as_needed_option dnl
+ $3 dnl
+ ],ax_warn_ldflags_variable,[$ax_compiler_flags_test])
+
+ AS_IF([test "$ax_enable_compile_warnings" != "no"],[
+ # "yes" flags
+ AX_APPEND_LINK_FLAGS([$4 $5 $6 $7],
+ ax_warn_ldflags_variable,
+ [$ax_compiler_flags_test])
+ ])
+ AS_IF([test "$ax_enable_compile_warnings" = "error"],[
+ # "error" flags; -Werror has to be appended unconditionally because
+ # it's not possible to test for
+ #
+ # suggest-attribute=format is disabled because it gives too many false
+ # positives
+ AX_APPEND_LINK_FLAGS([ dnl
+ $ax_compiler_flags_fatal_warnings_option dnl
+ ],ax_warn_ldflags_variable,[$ax_compiler_flags_test])
+ ])
+
+ # Substitute the variables
+ AC_SUBST(ax_warn_ldflags_variable)
+])dnl AX_COMPILER_FLAGS
diff --git a/m4/ax_cxx_compile_stdcxx.m4 b/m4/ax_cxx_compile_stdcxx.m4
new file mode 100644
index 0000000..5032bba
--- /dev/null
+++ b/m4/ax_cxx_compile_stdcxx.m4
@@ -0,0 +1,982 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+# Check for baseline language coverage in the compiler for the specified
+# version of the C++ standard. If necessary, add switches to CXX and
+# CXXCPP to enable support. VERSION may be '11' (for the C++11 standard)
+# or '14' (for the C++14 standard).
+#
+# The second argument, if specified, indicates whether you insist on an
+# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+# -std=c++11). If neither is specified, you get whatever works, with
+# preference for an extended mode.
+#
+# The third argument, if specified 'mandatory' or if left unspecified,
+# indicates that baseline support for the specified C++ standard is
+# required and that the macro should error out if no mode with that
+# support is found. If specified 'optional', then configuration proceeds
+# regardless, after defining HAVE_CXX${VERSION} if and only if a
+# supporting mode is found.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Benjamin Kosnik <bkoz redhat com>
+# Copyright (c) 2012 Zack Weinberg <zackw panix com>
+# Copyright (c) 2013 Roy Stogner <roystgnr ices utexas edu>
+# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov google com>
+# Copyright (c) 2015 Paul Norman <penorman mac com>
+# Copyright (c) 2015 Moritz Klammler <moritz klammler eu>
+# Copyright (c) 2016 Krzesimir Nowak <qdlacz gmail com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 7
+
+dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
+dnl (serial version number 13).
+
+AX_REQUIRE_DEFINED([AC_MSG_WARN])
+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
+ m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
+ [$1], [14], [ax_cxx_compile_alternatives="14 1y"],
+ [$1], [17], [ax_cxx_compile_alternatives="17 1z"],
+ [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
+ m4_if([$2], [], [],
+ [$2], [ext], [],
+ [$2], [noext], [],
+ [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
+ m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
+ [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
+ [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
+ [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
+ AC_LANG_PUSH([C++])dnl
+ ac_success=no
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
+ ax_cv_cxx_compile_cxx$1,
+ [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+ [ax_cv_cxx_compile_cxx$1=yes],
+ [ax_cv_cxx_compile_cxx$1=no])])
+ if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
+ ac_success=yes
+ fi
+
+ m4_if([$2], [noext], [], [dnl
+ if test x$ac_success = xno; then
+ for alternative in ${ax_cxx_compile_alternatives}; do
+ switch="-std=gnu++${alternative}"
+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+ $cachevar,
+ [ac_save_CXX="$CXX"
+ CXX="$CXX $switch"
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+ [eval $cachevar=yes],
+ [eval $cachevar=no])
+ CXX="$ac_save_CXX"])
+ if eval test x\$$cachevar = xyes; then
+ CXX="$CXX $switch"
+ if test -n "$CXXCPP" ; then
+ CXXCPP="$CXXCPP $switch"
+ fi
+ ac_success=yes
+ break
+ fi
+ done
+ fi])
+
+ m4_if([$2], [ext], [], [dnl
+ if test x$ac_success = xno; then
+ dnl HP's aCC needs +std=c++11 according to:
+ dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
+ dnl Cray's crayCC needs "-h std=c++11"
+ for alternative in ${ax_cxx_compile_alternatives}; do
+ for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+ $cachevar,
+ [ac_save_CXX="$CXX"
+ CXX="$CXX $switch"
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+ [eval $cachevar=yes],
+ [eval $cachevar=no])
+ CXX="$ac_save_CXX"])
+ if eval test x\$$cachevar = xyes; then
+ CXX="$CXX $switch"
+ if test -n "$CXXCPP" ; then
+ CXXCPP="$CXXCPP $switch"
+ fi
+ ac_success=yes
+ break
+ fi
+ done
+ if test x$ac_success = xyes; then
+ break
+ fi
+ done
+ fi])
+ AC_LANG_POP([C++])
+ if test x$ax_cxx_compile_cxx$1_required = xtrue; then
+ if test x$ac_success = xno; then
+ AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
+ fi
+ fi
+ if test x$ac_success = xno; then
+ HAVE_CXX$1=0
+ AC_MSG_NOTICE([No compiler with C++$1 support was found])
+ else
+ HAVE_CXX$1=1
+ AC_DEFINE(HAVE_CXX$1,1,
+ [define if the compiler supports basic C++$1 syntax])
+ fi
+ AC_SUBST(HAVE_CXX$1)
+ m4_if([$1], [17], [AC_MSG_WARN([C++17 is not yet standardized, so the checks may change in incompatible
ways anytime])])
+])
+
+
+dnl Test body for checking C++11 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+)
+
+
+dnl Test body for checking C++14 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+)
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_17
+)
+
+dnl Tests for new features in C++11
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+ namespace test_static_assert
+ {
+
+ template <typename T>
+ struct check
+ {
+ static_assert(sizeof(int) <= sizeof(T), "not big enough");
+ };
+
+ }
+
+ namespace test_final_override
+ {
+
+ struct Base
+ {
+ virtual void f() {}
+ };
+
+ struct Derived : public Base
+ {
+ virtual void f() override {}
+ };
+
+ }
+
+ namespace test_double_right_angle_brackets
+ {
+
+ template < typename T >
+ struct check {};
+
+ typedef check<void> single_type;
+ typedef check<check<void>> double_type;
+ typedef check<check<check<void>>> triple_type;
+ typedef check<check<check<check<void>>>> quadruple_type;
+
+ }
+
+ namespace test_decltype
+ {
+
+ int
+ f()
+ {
+ int a = 1;
+ decltype(a) b = 2;
+ return a + b;
+ }
+
+ }
+
+ namespace test_type_deduction
+ {
+
+ template < typename T1, typename T2 >
+ struct is_same
+ {
+ static const bool value = false;
+ };
+
+ template < typename T >
+ struct is_same<T, T>
+ {
+ static const bool value = true;
+ };
+
+ template < typename T1, typename T2 >
+ auto
+ add(T1 a1, T2 a2) -> decltype(a1 + a2)
+ {
+ return a1 + a2;
+ }
+
+ int
+ test(const int c, volatile int v)
+ {
+ static_assert(is_same<int, decltype(0)>::value == true, "");
+ static_assert(is_same<int, decltype(c)>::value == false, "");
+ static_assert(is_same<int, decltype(v)>::value == false, "");
+ auto ac = c;
+ auto av = v;
+ auto sumi = ac + av + 'x';
+ auto sumf = ac + av + 1.0;
+ static_assert(is_same<int, decltype(ac)>::value == true, "");
+ static_assert(is_same<int, decltype(av)>::value == true, "");
+ static_assert(is_same<int, decltype(sumi)>::value == true, "");
+ static_assert(is_same<int, decltype(sumf)>::value == false, "");
+ static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+ return (sumf > 0.0) ? sumi : add(c, v);
+ }
+
+ }
+
+ namespace test_noexcept
+ {
+
+ int f() { return 0; }
+ int g() noexcept { return 0; }
+
+ static_assert(noexcept(f()) == false, "");
+ static_assert(noexcept(g()) == true, "");
+
+ }
+
+ namespace test_constexpr
+ {
+
+ template < typename CharT >
+ unsigned long constexpr
+ strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+ {
+ return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+ }
+
+ template < typename CharT >
+ unsigned long constexpr
+ strlen_c(const CharT *const s) noexcept
+ {
+ return strlen_c_r(s, 0UL);
+ }
+
+ static_assert(strlen_c("") == 0UL, "");
+ static_assert(strlen_c("1") == 1UL, "");
+ static_assert(strlen_c("example") == 7UL, "");
+ static_assert(strlen_c("another\0example") == 7UL, "");
+
+ }
+
+ namespace test_rvalue_references
+ {
+
+ template < int N >
+ struct answer
+ {
+ static constexpr int value = N;
+ };
+
+ answer<1> f(int&) { return answer<1>(); }
+ answer<2> f(const int&) { return answer<2>(); }
+ answer<3> f(int&&) { return answer<3>(); }
+
+ void
+ test()
+ {
+ int i = 0;
+ const int c = 0;
+ static_assert(decltype(f(i))::value == 1, "");
+ static_assert(decltype(f(c))::value == 2, "");
+ static_assert(decltype(f(0))::value == 3, "");
+ }
+
+ }
+
+ namespace test_uniform_initialization
+ {
+
+ struct test
+ {
+ static const int zero {};
+ static const int one {1};
+ };
+
+ static_assert(test::zero == 0, "");
+ static_assert(test::one == 1, "");
+
+ }
+
+ namespace test_lambdas
+ {
+
+ void
+ test1()
+ {
+ auto lambda1 = [](){};
+ auto lambda2 = lambda1;
+ lambda1();
+ lambda2();
+ }
+
+ int
+ test2()
+ {
+ auto a = [](int i, int j){ return i + j; }(1, 2);
+ auto b = []() -> int { return '0'; }();
+ auto c = [=](){ return a + b; }();
+ auto d = [&](){ return c; }();
+ auto e = [a, &b](int x) mutable {
+ const auto identity = [](int y){ return y; };
+ for (auto i = 0; i < a; ++i)
+ a += b--;
+ return x + identity(a + b);
+ }(0);
+ return a + b + c + d + e;
+ }
+
+ int
+ test3()
+ {
+ const auto nullary = [](){ return 0; };
+ const auto unary = [](int x){ return x; };
+ using nullary_t = decltype(nullary);
+ using unary_t = decltype(unary);
+ const auto higher1st = [](nullary_t f){ return f(); };
+ const auto higher2nd = [unary](nullary_t f1){
+ return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+ };
+ return higher1st(nullary) + higher2nd(nullary)(unary);
+ }
+
+ }
+
+ namespace test_variadic_templates
+ {
+
+ template <int...>
+ struct sum;
+
+ template <int N0, int... N1toN>
+ struct sum<N0, N1toN...>
+ {
+ static constexpr auto value = N0 + sum<N1toN...>::value;
+ };
+
+ template <>
+ struct sum<>
+ {
+ static constexpr auto value = 0;
+ };
+
+ static_assert(sum<>::value == 0, "");
+ static_assert(sum<1>::value == 1, "");
+ static_assert(sum<23>::value == 23, "");
+ static_assert(sum<1, 2>::value == 3, "");
+ static_assert(sum<5, 5, 11>::value == 21, "");
+ static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+ }
+
+ // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+ // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+ // because of this.
+ namespace test_template_alias_sfinae
+ {
+
+ struct foo {};
+
+ template<typename T>
+ using member = typename T::member_type;
+
+ template<typename T>
+ void func(...) {}
+
+ template<typename T>
+ void func(member<T>*) {}
+
+ void test();
+
+ void test() { func<foo>(0); }
+
+ }
+
+} // namespace cxx11
+
+#endif // __cplusplus >= 201103L
+
+]])
+
+
+dnl Tests for new features in C++14
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
+
+// If the compiler admits that it is not ready for C++14, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201402L
+
+#error "This is not a C++14 compiler"
+
+#else
+
+namespace cxx14
+{
+
+ namespace test_polymorphic_lambdas
+ {
+
+ int
+ test()
+ {
+ const auto lambda = [](auto&&... args){
+ const auto istiny = [](auto x){
+ return (sizeof(x) == 1UL) ? 1 : 0;
+ };
+ const int aretiny[] = { istiny(args)... };
+ return aretiny[0];
+ };
+ return lambda(1, 1L, 1.0f, '1');
+ }
+
+ }
+
+ namespace test_binary_literals
+ {
+
+ constexpr auto ivii = 0b0000000000101010;
+ static_assert(ivii == 42, "wrong value");
+
+ }
+
+ namespace test_generalized_constexpr
+ {
+
+ template < typename CharT >
+ constexpr unsigned long
+ strlen_c(const CharT *const s) noexcept
+ {
+ auto length = 0UL;
+ for (auto p = s; *p; ++p)
+ ++length;
+ return length;
+ }
+
+ static_assert(strlen_c("") == 0UL, "");
+ static_assert(strlen_c("x") == 1UL, "");
+ static_assert(strlen_c("test") == 4UL, "");
+ static_assert(strlen_c("another\0test") == 7UL, "");
+
+ }
+
+ namespace test_lambda_init_capture
+ {
+
+ int
+ test()
+ {
+ auto x = 0;
+ const auto lambda1 = [a = x](int b){ return a + b; };
+ const auto lambda2 = [a = lambda1(x)](){ return a; };
+ return lambda2();
+ }
+
+ }
+
+ namespace test_digit_separators
+ {
+
+ constexpr auto ten_million = 100'000'000;
+ static_assert(ten_million == 100000000, "");
+
+ }
+
+ namespace test_return_type_deduction
+ {
+
+ auto f(int& x) { return x; }
+ decltype(auto) g(int& x) { return x; }
+
+ template < typename T1, typename T2 >
+ struct is_same
+ {
+ static constexpr auto value = false;
+ };
+
+ template < typename T >
+ struct is_same<T, T>
+ {
+ static constexpr auto value = true;
+ };
+
+ int
+ test()
+ {
+ auto x = 0;
+ static_assert(is_same<int, decltype(f(x))>::value, "");
+ static_assert(is_same<int&, decltype(g(x))>::value, "");
+ return x;
+ }
+
+ }
+
+} // namespace cxx14
+
+#endif // __cplusplus >= 201402L
+
+]])
+
+
+dnl Tests for new features in C++17
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
+
+// If the compiler admits that it is not ready for C++17, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus <= 201402L
+
+#error "This is not a C++17 compiler"
+
+#else
+
+#if defined(__clang__)
+ #define REALLY_CLANG
+#else
+ #if defined(__GNUC__)
+ #define REALLY_GCC
+ #endif
+#endif
+
+#include <initializer_list>
+#include <utility>
+#include <type_traits>
+
+namespace cxx17
+{
+
+#if !defined(REALLY_CLANG)
+ namespace test_constexpr_lambdas
+ {
+
+ // TODO: test it with clang++ from git
+
+ constexpr int foo = [](){return 42;}();
+
+ }
+#endif // !defined(REALLY_CLANG)
+
+ namespace test::nested_namespace::definitions
+ {
+
+ }
+
+ namespace test_fold_expression
+ {
+
+ template<typename... Args>
+ int multiply(Args... args)
+ {
+ return (args * ... * 1);
+ }
+
+ template<typename... Args>
+ bool all(Args... args)
+ {
+ return (args && ...);
+ }
+
+ }
+
+ namespace test_extended_static_assert
+ {
+
+ static_assert (true);
+
+ }
+
+ namespace test_auto_brace_init_list
+ {
+
+ auto foo = {5};
+ auto bar {5};
+
+ static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value);
+ static_assert(std::is_same<int, decltype(bar)>::value);
+ }
+
+ namespace test_typename_in_template_template_parameter
+ {
+
+ template<template<typename> typename X> struct D;
+
+ }
+
+ namespace test_fallthrough_nodiscard_maybe_unused_attributes
+ {
+
+ int f1()
+ {
+ return 42;
+ }
+
+ [[nodiscard]] int f2()
+ {
+ [[maybe_unused]] auto unused = f1();
+
+ switch (f1())
+ {
+ case 17:
+ f1();
+ [[fallthrough]];
+ case 42:
+ f1();
+ }
+ return f1();
+ }
+
+ }
+
+ namespace test_extended_aggregate_initialization
+ {
+
+ struct base1
+ {
+ int b1, b2 = 42;
+ };
+
+ struct base2
+ {
+ base2() {
+ b3 = 42;
+ }
+ int b3;
+ };
+
+ struct derived : base1, base2
+ {
+ int d;
+ };
+
+ derived d1 {{1, 2}, {}, 4}; // full initialization
+ derived d2 {{}, {}, 4}; // value-initialized bases
+
+ }
+
+ namespace test_general_range_based_for_loop
+ {
+
+ struct iter
+ {
+ int i;
+
+ int& operator* ()
+ {
+ return i;
+ }
+
+ const int& operator* () const
+ {
+ return i;
+ }
+
+ iter& operator++()
+ {
+ ++i;
+ return *this;
+ }
+ };
+
+ struct sentinel
+ {
+ int i;
+ };
+
+ bool operator== (const iter& i, const sentinel& s)
+ {
+ return i.i == s.i;
+ }
+
+ bool operator!= (const iter& i, const sentinel& s)
+ {
+ return !(i == s);
+ }
+
+ struct range
+ {
+ iter begin() const
+ {
+ return {0};
+ }
+
+ sentinel end() const
+ {
+ return {5};
+ }
+ };
+
+ void f()
+ {
+ range r {};
+
+ for (auto i : r)
+ {
+ [[maybe_unused]] auto v = i;
+ }
+ }
+
+ }
+
+ namespace test_lambda_capture_asterisk_this_by_value
+ {
+
+ struct t
+ {
+ int i;
+ int foo()
+ {
+ return [*this]()
+ {
+ return i;
+ }();
+ }
+ };
+
+ }
+
+ namespace test_enum_class_construction
+ {
+
+ enum class byte : unsigned char
+ {};
+
+ byte foo {42};
+
+ }
+
+ namespace test_constexpr_if
+ {
+
+ template <bool cond>
+ int f ()
+ {
+ if constexpr(cond)
+ {
+ return 13;
+ }
+ else
+ {
+ return 42;
+ }
+ }
+
+ }
+
+ namespace test_selection_statement_with_initializer
+ {
+
+ int f()
+ {
+ return 13;
+ }
+
+ int f2()
+ {
+ if (auto i = f(); i > 0)
+ {
+ return 3;
+ }
+
+ switch (auto i = f(); i + 4)
+ {
+ case 17:
+ return 2;
+
+ default:
+ return 1;
+ }
+ }
+
+ }
+
+#if !defined(REALLY_CLANG)
+ namespace test_template_argument_deduction_for_class_templates
+ {
+
+ // TODO: test it with clang++ from git
+
+ template <typename T1, typename T2>
+ struct pair
+ {
+ pair (T1 p1, T2 p2)
+ : m1 {p1},
+ m2 {p2}
+ {}
+
+ T1 m1;
+ T2 m2;
+ };
+
+ void f()
+ {
+ [[maybe_unused]] auto p = pair{13, 42u};
+ }
+
+ }
+#endif // !defined(REALLY_CLANG)
+
+ namespace test_non_type_auto_template_parameters
+ {
+
+ template <auto n>
+ struct B
+ {};
+
+ B<5> b1;
+ B<'a'> b2;
+
+ }
+
+#if !defined(REALLY_CLANG)
+ namespace test_structured_bindings
+ {
+
+ // TODO: test it with clang++ from git
+
+ int arr[2] = { 1, 2 };
+ std::pair<int, int> pr = { 1, 2 };
+
+ auto f1() -> int(&)[2]
+ {
+ return arr;
+ }
+
+ auto f2() -> std::pair<int, int>&
+ {
+ return pr;
+ }
+
+ struct S
+ {
+ int x1 : 2;
+ volatile double y1;
+ };
+
+ S f3()
+ {
+ return {};
+ }
+
+ auto [ x1, y1 ] = f1();
+ auto& [ xr1, yr1 ] = f1();
+ auto [ x2, y2 ] = f2();
+ auto& [ xr2, yr2 ] = f2();
+ const auto [ x3, y3 ] = f3();
+
+ }
+#endif // !defined(REALLY_CLANG)
+
+#if !defined(REALLY_CLANG)
+ namespace test_exception_spec_type_system
+ {
+
+ // TODO: test it with clang++ from git
+
+ struct Good {};
+ struct Bad {};
+
+ void g1() noexcept;
+ void g2();
+
+ template<typename T>
+ Bad
+ f(T*, T*);
+
+ template<typename T1, typename T2>
+ Good
+ f(T1*, T2*);
+
+ static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
+
+ }
+#endif // !defined(REALLY_CLANG)
+
+ namespace test_inline_variables
+ {
+
+ template<class T> void f(T)
+ {}
+
+ template<class T> inline T g(T)
+ {
+ return T{};
+ }
+
+ template<> inline void f<>(int)
+ {}
+
+ template<> int g<>(int)
+ {
+ return 5;
+ }
+
+ }
+
+} // namespace cxx17
+
+#endif // __cplusplus <= 201402L
+
+]])
diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4
new file mode 100644
index 0000000..1733fd8
--- /dev/null
+++ b/m4/ax_cxx_compile_stdcxx_11.m4
@@ -0,0 +1,39 @@
+# =============================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
+# =============================================================================
+#
+# SYNOPSIS
+#
+# AX_CXX_COMPILE_STDCXX_11([ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+# Check for baseline language coverage in the compiler for the C++11
+# standard; if necessary, add switches to CXX and CXXCPP to enable
+# support.
+#
+# This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX
+# macro with the version set to C++11. The two optional arguments are
+# forwarded literally as the second and third argument respectively.
+# Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for
+# more information. If you want to use this macro, you also need to
+# download the ax_cxx_compile_stdcxx.m4 file.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Benjamin Kosnik <bkoz redhat com>
+# Copyright (c) 2012 Zack Weinberg <zackw panix com>
+# Copyright (c) 2013 Roy Stogner <roystgnr ices utexas edu>
+# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov google com>
+# Copyright (c) 2015 Paul Norman <penorman mac com>
+# Copyright (c) 2015 Moritz Klammler <moritz klammler eu>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 18
+
+AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX])
+AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [AX_CXX_COMPILE_STDCXX([11], [$1], [$2])])
diff --git a/m4/ax_is_release.m4 b/m4/ax_is_release.m4
new file mode 100644
index 0000000..9097ddb
--- /dev/null
+++ b/m4/ax_is_release.m4
@@ -0,0 +1,80 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_is_release.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_IS_RELEASE(POLICY)
+#
+# DESCRIPTION
+#
+# Determine whether the code is being configured as a release, or from
+# git. Set the ax_is_release variable to 'yes' or 'no'.
+#
+# If building a release version, it is recommended that the configure
+# script disable compiler errors and debug features, by conditionalising
+# them on the ax_is_release variable. If building from git, these
+# features should be enabled.
+#
+# The POLICY parameter specifies how ax_is_release is determined. It can
+# take the following values:
+#
+# * git-directory: ax_is_release will be 'no' if a '.git' directory exists
+# * minor-version: ax_is_release will be 'no' if the minor version number
+# in $PACKAGE_VERSION is odd; this assumes
+# $PACKAGE_VERSION follows the 'major.minor.micro' scheme
+# * micro-version: ax_is_release will be 'no' if the micro version number
+# in $PACKAGE_VERSION is odd; this assumes
+# $PACKAGE_VERSION follows the 'major.minor.micro' scheme
+# * dash-version: ax_is_release will be 'no' if there is a dash '-'
+# in $PACKAGE_VERSION, for example 1.2-pre3, 1.2.42-a8b9
+# or 2.0-dirty (in particular this is suitable for use
+# with git-version-gen)
+# * always: ax_is_release will always be 'yes'
+# * never: ax_is_release will always be 'no'
+#
+# Other policies may be added in future.
+#
+# LICENSE
+#
+# Copyright (c) 2015 Philip Withnall <philip tecnocode co uk>
+# Copyright (c) 2016 Collabora Ltd.
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved.
+
+#serial 7
+
+AC_DEFUN([AX_IS_RELEASE],[
+ AC_BEFORE([AC_INIT],[$0])
+
+ m4_case([$1],
+ [git-directory],[
+ # $is_release = (.git directory does not exist)
+ AS_IF([test -d ${srcdir}/.git],[ax_is_release=no],[ax_is_release=yes])
+ ],
+ [minor-version],[
+ # $is_release = ($minor_version is even)
+ minor_version=`echo "$PACKAGE_VERSION" | sed 's/[[^.]][[^.]]*.\([[^.]][[^.]]*\).*/\1/'`
+ AS_IF([test "$(( $minor_version % 2 ))" -ne 0],
+ [ax_is_release=no],[ax_is_release=yes])
+ ],
+ [micro-version],[
+ # $is_release = ($micro_version is even)
+ micro_version=`echo "$PACKAGE_VERSION" | sed 's/[[^.]]*\.[[^.]]*\.\([[^.]]*\).*/\1/'`
+ AS_IF([test "$(( $micro_version % 2 ))" -ne 0],
+ [ax_is_release=no],[ax_is_release=yes])
+ ],
+ [dash-version],[
+ # $is_release = ($PACKAGE_VERSION has a dash)
+ AS_CASE([$PACKAGE_VERSION],
+ [*-*], [ax_is_release=no],
+ [*], [ax_is_release=yes])
+ ],
+ [always],[ax_is_release=yes],
+ [never],[ax_is_release=no],
+ [
+ AC_MSG_ERROR([Invalid policy. Valid policies: git-directory, minor-version, micro-version,
dash-version, always, never.])
+ ])
+])
diff --git a/m4/ax_require_defined.m4 b/m4/ax_require_defined.m4
new file mode 100644
index 0000000..17c3eab
--- /dev/null
+++ b/m4/ax_require_defined.m4
@@ -0,0 +1,37 @@
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_require_defined.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_REQUIRE_DEFINED(MACRO)
+#
+# DESCRIPTION
+#
+# AX_REQUIRE_DEFINED is a simple helper for making sure other macros have
+# been defined and thus are available for use. This avoids random issues
+# where a macro isn't expanded. Instead the configure script emits a
+# non-fatal:
+#
+# ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found
+#
+# It's like AC_REQUIRE except it doesn't expand the required macro.
+#
+# Here's an example:
+#
+# AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
+#
+# LICENSE
+#
+# Copyright (c) 2014 Mike Frysinger <vapier gentoo org>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 2
+
+AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
+ m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
+])dnl AX_REQUIRE_DEFINED
diff --git a/m4/gsettings.m4 b/m4/gsettings.m4
new file mode 100644
index 0000000..35ee5aa
--- /dev/null
+++ b/m4/gsettings.m4
@@ -0,0 +1,83 @@
+dnl GLIB_GSETTINGS
+dnl Defines GSETTINGS_SCHEMAS_INSTALL which controls whether
+dnl the schema should be compiled
+dnl
+
+AC_DEFUN([GLIB_GSETTINGS],
+[
+ m4_pattern_allow([AM_V_GEN])
+ AC_ARG_ENABLE(schemas-compile,
+ AS_HELP_STRING([--disable-schemas-compile],
+ [Disable regeneration of gschemas.compiled on install]),
+ [case ${enableval} in
+ yes) GSETTINGS_DISABLE_SCHEMAS_COMPILE="" ;;
+ no) GSETTINGS_DISABLE_SCHEMAS_COMPILE="1" ;;
+ *) AC_MSG_ERROR([bad value ${enableval} for --enable-schemas-compile]) ;;
+ esac])
+ AC_SUBST([GSETTINGS_DISABLE_SCHEMAS_COMPILE])
+ PKG_PROG_PKG_CONFIG([0.16])
+ AC_SUBST(gsettingsschemadir, [${datadir}/glib-2.0/schemas])
+ if test x$cross_compiling != xyes; then
+ GLIB_COMPILE_SCHEMAS=`$PKG_CONFIG --variable glib_compile_schemas gio-2.0`
+ else
+ AC_PATH_PROG(GLIB_COMPILE_SCHEMAS, glib-compile-schemas)
+ fi
+ AC_SUBST(GLIB_COMPILE_SCHEMAS)
+ if test "x$GLIB_COMPILE_SCHEMAS" = "x"; then
+ ifelse([$2],,[AC_MSG_ERROR([glib-compile-schemas not found.])],[$2])
+ else
+ ifelse([$1],,[:],[$1])
+ fi
+
+ GSETTINGS_RULES='
+.PHONY : uninstall-gsettings-schemas install-gsettings-schemas clean-gsettings-schemas
+
+mostlyclean-am: clean-gsettings-schemas
+
+gsettings__enum_file = $(addsuffix .enums.xml,$(gsettings_ENUM_NAMESPACE))
+
+%.gschema.valid: %.gschema.xml $(gsettings__enum_file)
+ $(AM_V_GEN) $(GLIB_COMPILE_SCHEMAS) --strict --dry-run $(addprefix
--schema-file=,$(gsettings__enum_file)) --schema-file=$< && mkdir -p [$](@D) && touch [$]@
+
+all-am: $(gsettings_SCHEMAS:.xml=.valid)
+uninstall-am: uninstall-gsettings-schemas
+install-data-am: install-gsettings-schemas
+
+.SECONDARY: $(gsettings_SCHEMAS)
+
+install-gsettings-schemas: $(gsettings_SCHEMAS) $(gsettings__enum_file)
+ @$(NORMAL_INSTALL)
+ if test -n "$^"; then \
+ test -z "$(gsettingsschemadir)" || $(MKDIR_P) "$(DESTDIR)$(gsettingsschemadir)"; \
+ $(INSTALL_DATA) $^ "$(DESTDIR)$(gsettingsschemadir)"; \
+ test -n "$(GSETTINGS_DISABLE_SCHEMAS_COMPILE)$(DESTDIR)" || $(GLIB_COMPILE_SCHEMAS)
$(gsettingsschemadir); \
+ fi
+
+uninstall-gsettings-schemas:
+ @$(NORMAL_UNINSTALL)
+ @list='\''$(gsettings_SCHEMAS) $(gsettings__enum_file)'\''; test -n "$(gsettingsschemadir)" || list=;
\
+ files=`for p in $$list; do echo $$p; done | sed -e '\''s|^.*/||'\''`; \
+ test -n "$$files" || exit 0; \
+ echo " ( cd '\''$(DESTDIR)$(gsettingsschemadir)'\'' && rm -f" $$files ")"; \
+ cd "$(DESTDIR)$(gsettingsschemadir)" && rm -f $$files
+ test -n "$(GSETTINGS_DISABLE_SCHEMAS_COMPILE)$(DESTDIR)" || $(GLIB_COMPILE_SCHEMAS)
$(gsettingsschemadir)
+
+clean-gsettings-schemas:
+ rm -f $(gsettings_SCHEMAS:.xml=.valid) $(gsettings__enum_file)
+
+ifdef gsettings_ENUM_NAMESPACE
+$(gsettings__enum_file): $(gsettings_ENUM_FILES)
+ $(AM_V_GEN) glib-mkenums --comments '\''<!-- @comment@ -->'\'' --fhead "<schemalist>" --vhead "
<@type@ id='\''$(gsettings_ENUM_NAMESPACE).@EnumName@'\''>" --vprod " <value nick='\''@valuenick@'\''
value='\''@valuenum@'\''/>" --vtail " </@type@>" --ftail "</schemalist>" [$]^ > [$]@.tmp && mv [$]@.tmp [$]@
+endif
+'
+ _GSETTINGS_SUBST(GSETTINGS_RULES)
+])
+
+dnl _GSETTINGS_SUBST(VARIABLE)
+dnl Abstract macro to do either _AM_SUBST_NOTMAKE or AC_SUBST
+AC_DEFUN([_GSETTINGS_SUBST],
+[
+AC_SUBST([$1])
+m4_ifdef([_AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE([$1])])
+]
+)
diff --git a/m4/pkg.m4 b/m4/pkg.m4
new file mode 100644
index 0000000..82bea96
--- /dev/null
+++ b/m4/pkg.m4
@@ -0,0 +1,275 @@
+dnl pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
+dnl serial 11 (pkg-config-0.29.1)
+dnl
+dnl Copyright © 2004 Scott James Remnant <scott netsplit com>.
+dnl Copyright © 2012-2015 Dan Nicholson <dbn lists gmail com>
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+dnl 02111-1307, USA.
+dnl
+dnl As a special exception to the GNU General Public License, if you
+dnl distribute this file as part of a program that contains a
+dnl configuration script generated by Autoconf, you may include it under
+dnl the same distribution terms that you use for the rest of that
+dnl program.
+
+dnl PKG_PREREQ(MIN-VERSION)
+dnl -----------------------
+dnl Since: 0.29
+dnl
+dnl Verify that the version of the pkg-config macros are at least
+dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
+dnl installed version of pkg-config, this checks the developer's version
+dnl of pkg.m4 when generating configure.
+dnl
+dnl To ensure that this macro is defined, also add:
+dnl m4_ifndef([PKG_PREREQ],
+dnl [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
+dnl
+dnl See the "Since" comment for each macro you use to see what version
+dnl of the macros you require.
+m4_defun([PKG_PREREQ],
+[m4_define([PKG_MACROS_VERSION], [0.29.1])
+m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
+ [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
+])dnl PKG_PREREQ
+
+dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
+dnl ----------------------------------
+dnl Since: 0.16
+dnl
+dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
+dnl first found in the path. Checks that the version of pkg-config found
+dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
+dnl used since that's the first version where most current features of
+dnl pkg-config existed.
+AC_DEFUN([PKG_PROG_PKG_CONFIG],
+[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
+m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
+m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
+AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
+AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
+AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
+
+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
+ AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
+fi
+if test -n "$PKG_CONFIG"; then
+ _pkg_min_version=m4_default([$1], [0.9.0])
+ AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
+ if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
+ AC_MSG_RESULT([yes])
+ else
+ AC_MSG_RESULT([no])
+ PKG_CONFIG=""
+ fi
+fi[]dnl
+])dnl PKG_PROG_PKG_CONFIG
+
+dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------------------------------
+dnl Since: 0.18
+dnl
+dnl Check to see whether a particular set of modules exists. Similar to
+dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
+dnl
+dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+dnl only at the first occurence in configure.ac, so if the first place
+dnl it's called might be skipped (such as if it is within an "if", you
+dnl have to call PKG_CHECK_EXISTS manually
+AC_DEFUN([PKG_CHECK_EXISTS],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+if test -n "$PKG_CONFIG" && \
+ AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
+ m4_default([$2], [:])
+m4_ifvaln([$3], [else
+ $3])dnl
+fi])
+
+dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
+dnl ---------------------------------------------
+dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
+dnl pkg_failed based on the result.
+m4_define([_PKG_CONFIG],
+[if test -n "$$1"; then
+ pkg_cv_[]$1="$$1"
+ elif test -n "$PKG_CONFIG"; then
+ PKG_CHECK_EXISTS([$3],
+ [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
+ test "x$?" != "x0" && pkg_failed=yes ],
+ [pkg_failed=yes])
+ else
+ pkg_failed=untried
+fi[]dnl
+])dnl _PKG_CONFIG
+
+dnl _PKG_SHORT_ERRORS_SUPPORTED
+dnl ---------------------------
+dnl Internal check to see if pkg-config supports short errors.
+AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+ _pkg_short_errors_supported=yes
+else
+ _pkg_short_errors_supported=no
+fi[]dnl
+])dnl _PKG_SHORT_ERRORS_SUPPORTED
+
+
+dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl [ACTION-IF-NOT-FOUND])
+dnl --------------------------------------------------------------
+dnl Since: 0.4.0
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
+dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
+AC_DEFUN([PKG_CHECK_MODULES],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
+AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
+
+pkg_failed=no
+AC_MSG_CHECKING([for $1])
+
+_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
+_PKG_CONFIG([$1][_LIBS], [libs], [$2])
+
+m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
+and $1[]_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.])
+
+if test $pkg_failed = yes; then
+ AC_MSG_RESULT([no])
+ _PKG_SHORT_ERRORS_SUPPORTED
+ if test $_pkg_short_errors_supported = yes; then
+ $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
+ else
+ $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
+ fi
+ # Put the nasty error message in config.log where it belongs
+ echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
+
+ m4_default([$4], [AC_MSG_ERROR(
+[Package requirements ($2) were not met:
+
+$$1_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+_PKG_TEXT])[]dnl
+ ])
+elif test $pkg_failed = untried; then
+ AC_MSG_RESULT([no])
+ m4_default([$4], [AC_MSG_FAILURE(
+[The pkg-config script could not be found or is too old. Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+_PKG_TEXT
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
+ ])
+else
+ $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
+ $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
+ AC_MSG_RESULT([yes])
+ $3
+fi[]dnl
+])dnl PKG_CHECK_MODULES
+
+
+dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl [ACTION-IF-NOT-FOUND])
+dnl ---------------------------------------------------------------------
+dnl Since: 0.29
+dnl
+dnl Checks for existence of MODULES and gathers its build flags with
+dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
+dnl and VARIABLE-PREFIX_LIBS from --libs.
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
+dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
+dnl configure.ac.
+AC_DEFUN([PKG_CHECK_MODULES_STATIC],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+_save_PKG_CONFIG=$PKG_CONFIG
+PKG_CONFIG="$PKG_CONFIG --static"
+PKG_CHECK_MODULES($@)
+PKG_CONFIG=$_save_PKG_CONFIG[]dnl
+])dnl PKG_CHECK_MODULES_STATIC
+
+
+dnl PKG_INSTALLDIR([DIRECTORY])
+dnl -------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable pkgconfigdir as the location where a module
+dnl should install pkg-config .pc files. By default the directory is
+dnl $libdir/pkgconfig, but the default can be changed by passing
+dnl DIRECTORY. The user can override through the --with-pkgconfigdir
+dnl parameter.
+AC_DEFUN([PKG_INSTALLDIR],
+[m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
+m4_pushdef([pkg_description],
+ [pkg-config installation directory @<:@]pkg_default[@:>@])
+AC_ARG_WITH([pkgconfigdir],
+ [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
+ [with_pkgconfigdir=]pkg_default)
+AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
+m4_popdef([pkg_default])
+m4_popdef([pkg_description])
+])dnl PKG_INSTALLDIR
+
+
+dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
+dnl --------------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable noarch_pkgconfigdir as the location where a
+dnl module should install arch-independent pkg-config .pc files. By
+dnl default the directory is $datadir/pkgconfig, but the default can be
+dnl changed by passing DIRECTORY. The user can override through the
+dnl --with-noarch-pkgconfigdir parameter.
+AC_DEFUN([PKG_NOARCH_INSTALLDIR],
+[m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
+m4_pushdef([pkg_description],
+ [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
+AC_ARG_WITH([noarch-pkgconfigdir],
+ [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
+ [with_noarch_pkgconfigdir=]pkg_default)
+AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
+m4_popdef([pkg_default])
+m4_popdef([pkg_description])
+])dnl PKG_NOARCH_INSTALLDIR
+
+
+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------
+dnl Since: 0.28
+dnl
+dnl Retrieves the value of the pkg-config variable for the given module.
+AC_DEFUN([PKG_CHECK_VAR],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
+
+_PKG_CONFIG([$1], [variable="][$3]["], [$2])
+AS_VAR_COPY([$1], [pkg_cv_][$1])
+
+AS_VAR_IF([$1], [""], [$5], [$4])dnl
+])dnl PKG_CHECK_VAR
diff --git a/m4/yelp.m4 b/m4/yelp.m4
new file mode 100644
index 0000000..5db847f
--- /dev/null
+++ b/m4/yelp.m4
@@ -0,0 +1,213 @@
+AC_DEFUN([YELP_HELP_INIT],
+[
+AC_REQUIRE([AC_PROG_LN_S])
+m4_pattern_allow([AM_V_at])
+m4_pattern_allow([AM_V_GEN])
+m4_pattern_allow([AM_DEFAULT_VERBOSITY])
+
+YELP_LC_MEDIA_LINKS=true
+YELP_LC_DIST=true
+
+for yelpopt in [$1]; do
+ case $yelpopt in
+ lc-media-links) YELP_LC_MEDIA_LINKS=true ;;
+ no-lc-media-links) YELP_LC_MEDIA_LINKS= ;;
+ lc-dist) YELP_LC_DIST=true ;;
+ no-lc-dist) YELP_LC_DIST= ;;
+ *) AC_MSG_ERROR([Unrecognized [YELP_HELP_INIT] option $yelpopt"]) ;;
+ esac
+done;
+AC_SUBST([YELP_LC_MEDIA_LINKS])
+AC_SUBST([YELP_LC_DIST])
+
+AC_ARG_WITH([help-dir],
+ AS_HELP_STRING([--with-help-dir=DIR],
+ [path where help files are installed]),,
+ [with_help_dir='${datadir}/help'])
+HELP_DIR="$with_help_dir"
+AC_SUBST(HELP_DIR)
+
+AC_ARG_VAR([ITSTOOL], [Path to the `itstool` command])
+AC_CHECK_PROG([ITSTOOL], [itstool], [itstool])
+if test x"$ITSTOOL" = x; then
+ AC_MSG_ERROR([itstool not found])
+fi
+
+AC_ARG_VAR([XMLLINT], [Path to the `xmllint` command])
+AC_CHECK_PROG([XMLLINT], [xmllint], [xmllint])
+if test x"$XMLLINT" = x; then
+ AC_MSG_ERROR([xmllint not found])
+fi
+
+YELP_HELP_RULES='
+HELP_ID ?=
+HELP_POT ?=
+HELP_FILES ?=
+HELP_EXTRA ?=
+HELP_MEDIA ?=
+HELP_LINGUAS ?=
+
+_HELP_LINGUAS = $(if $(filter environment,$(origin LINGUAS)),$(filter
$(LINGUAS),$(HELP_LINGUAS)),$(HELP_LINGUAS))
+_HELP_POTFILE = $(if $(HELP_POT),$(HELP_POT),$(if $(HELP_ID),$(HELP_ID).pot))
+_HELP_POFILES = $(if $(HELP_ID),$(foreach lc,$(_HELP_LINGUAS),$(lc)/$(lc).po))
+_HELP_MOFILES = $(patsubst %.po,%.mo,$(_HELP_POFILES))
+_HELP_C_FILES = $(foreach f,$(HELP_FILES),C/$(f))
+_HELP_C_EXTRA = $(foreach f,$(HELP_EXTRA),C/$(f))
+_HELP_C_MEDIA = $(foreach f,$(HELP_MEDIA),C/$(f))
+_HELP_LC_FILES = $(foreach lc,$(_HELP_LINGUAS),$(foreach f,$(HELP_FILES),$(lc)/$(f)))
+_HELP_LC_STAMPS = $(foreach lc,$(_HELP_LINGUAS),$(lc)/$(lc).stamp)
+
+_HELP_DEFAULT_V = $(if $(AM_DEFAULT_VERBOSITY),$(AM_DEFAULT_VERBOSITY),1)
+_HELP_V = $(if $(V),$(V),$(_HELP_DEFAULT_V))
+_HELP_LC_VERBOSE = $(_HELP_LC_VERBOSE_$(_HELP_V))
+_HELP_LC_VERBOSE_ = $(_HELP_LC_VERBOSE_$(_HELP_DEFAULT_V))
+_HELP_LC_VERBOSE_0 = @echo " GEN "$(dir [$]@);
+
+all: $(_HELP_C_FILES) $(_HELP_C_EXTRA) $(_HELP_C_MEDIA) $(_HELP_LC_FILES) $(_HELP_POFILES)
+
+.PHONY: pot
+pot: $(_HELP_POTFILE)
+$(_HELP_POTFILE): $(_HELP_C_FILES) $(_HELP_C_EXTRA) $(_HELP_C_MEDIA)
+ $(AM_V_GEN)if test -d "C"; then d=; else d="$(srcdir)/"; fi; \
+ $(ITSTOOL) -o "[$]@" $(foreach f,$(_HELP_C_FILES),"$${d}$(f)")
+
+.PHONY: repo
+repo: $(_HELP_POTFILE)
+ $(AM_V_at)for po in $(_HELP_POFILES); do \
+ if test "x[$](_HELP_V)" = "x0"; then echo " GEN $${po}"; fi; \
+ msgmerge -q -o "$${po}" "$${po}" "$(_HELP_POTFILE)"; \
+ done
+
+$(_HELP_POFILES):
+ $(AM_V_at)if ! test -d "$(dir [$]@)"; then mkdir "$(dir [$]@)"; fi
+ $(AM_V_at)if test ! -f "[$]@" -a -f "$(srcdir)/[$]@"; then cp "$(srcdir)/[$]@" "[$]@"; fi
+ $(AM_V_GEN)if ! test -f "[$]@"; then \
+ (cd "$(dir [$]@)" && \
+ $(ITSTOOL) -o "$(notdir [$]@).tmp" $(_HELP_C_FILES) && \
+ mv "$(notdir [$]@).tmp" "$(notdir [$]@)"); \
+ else \
+ (cd "$(dir [$]@)" && \
+ $(ITSTOOL) -o "$(notdir [$]@).tmp" $(_HELP_C_FILES) && \
+ msgmerge -o "$(notdir [$]@)" "$(notdir [$]@)" "$(notdir [$]@).tmp" && \
+ rm "$(notdir [$]@).tmp"); \
+ fi
+
+$(_HELP_MOFILES): %.mo: %.po
+ $(AM_V_at)if ! test -d "$(dir [$]@)"; then mkdir "$(dir [$]@)"; fi
+ $(AM_V_GEN)msgfmt -o "[$]@" "$<"
+
+$(_HELP_LC_FILES): $(_HELP_LINGUAS)
+$(_HELP_LINGUAS): $(_HELP_LC_STAMPS)
+$(_HELP_LC_STAMPS): %.stamp: %.mo
+$(_HELP_LC_STAMPS): $(_HELP_C_FILES) $(_HELP_C_EXTRA)
+ $(AM_V_at)if ! test -d "$(dir [$]@)"; then mkdir "$(dir [$]@)"; fi
+ $(_HELP_LC_VERBOSE)if test -d "C"; then d="../"; else d="$(abs_srcdir)/"; fi; \
+ mo="$(dir [$]@)$(patsubst %/$(notdir [$]@),%,[$]@).mo"; \
+ if test -f "$${mo}"; then mo="../$${mo}"; else mo="$(abs_srcdir)/$${mo}"; fi; \
+ (cd "$(dir [$]@)" && $(ITSTOOL) -m "$${mo}" $(foreach f,$(_HELP_C_FILES),$${d}/$(f))) && \
+ touch "[$]@"
+
+.PHONY: clean-help
+mostlyclean-am: $(if $(HELP_ID),clean-help)
+clean-help:
+ rm -f $(_HELP_LC_FILES) $(_HELP_LC_STAMPS) $(_HELP_MOFILES)
+
+EXTRA_DIST ?=
+EXTRA_DIST += $(_HELP_C_EXTRA) $(_HELP_C_MEDIA)
+EXTRA_DIST += $(if $(YELP_LC_DIST),$(foreach lc,$(HELP_LINGUAS),$(lc)/$(lc).stamp))
+EXTRA_DIST += $(foreach lc,$(HELP_LINGUAS),$(lc)/$(lc).po)
+EXTRA_DIST += $(foreach f,$(HELP_MEDIA),$(foreach lc,$(HELP_LINGUAS),$(wildcard $(lc)/$(f))))
+
+distdir: distdir-help-files
+distdir-help-files: $(_HELP_LC_FILES)
+ @for lc in C $(if $(YELP_LC_DIST),$(HELP_LINGUAS)) ; do \
+ $(MKDIR_P) "$(distdir)/$$lc"; \
+ for file in $(HELP_FILES); do \
+ if test -f "$$lc/$$file"; then d=./; else d=$(srcdir)/; fi; \
+ cp -p "$$d$$lc/$$file" "$(distdir)/$$lc/" || exit 1; \
+ done; \
+ done; \
+
+.PHONY: check-help
+check: check-help
+check-help:
+ for lc in C $(_HELP_LINGUAS); do \
+ if test -d "$$lc"; \
+ then d=; \
+ xmlpath="$$lc"; \
+ else \
+ d="$(srcdir)/"; \
+ xmlpath="$$lc:$(srcdir)/$$lc"; \
+ fi; \
+ for page in $(HELP_FILES); do \
+ echo "$(XMLLINT) --noout --noent --path $$xmlpath --xinclude $$d$$lc/$$page"; \
+ $(XMLLINT) --noout --noent --path "$$xmlpath" --xinclude "$$d$$lc/$$page"; \
+ done; \
+ done
+
+
+.PHONY: install-help
+install-data-am: $(if $(HELP_ID),install-help)
+install-help: $(_HELP_LC_FILES)
+ @for lc in C $(_HELP_LINGUAS); do \
+ $(mkinstalldirs) "$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)" || exit 1; \
+ done
+ @for lc in C $(_HELP_LINGUAS); do for f in $(HELP_FILES); do \
+ if test -f "$$lc/$$f"; then d=; else d="$(srcdir)/"; fi; \
+ helpdir="$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)/"; \
+ if ! test -d "$$helpdir"; then $(mkinstalldirs) "$$helpdir"; fi; \
+ echo "$(INSTALL_DATA) $$d$$lc/$$f $$helpdir`basename $$f`"; \
+ $(INSTALL_DATA) "$$d$$lc/$$f" "$$helpdir`basename $$f`" || exit 1; \
+ done; done
+ @for f in $(_HELP_C_EXTRA); do \
+ lc=`dirname "$$f"`; lc=`basename "$$lc"`; \
+ if test -f "$$f"; then d=; else d="$(srcdir)/"; fi; \
+ helpdir="$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)/"; \
+ if ! test -d "$$helpdir"; then $(mkinstalldirs) "$$helpdir"; fi; \
+ echo "$(INSTALL_DATA) $$d$$f $$helpdir`basename $$f`"; \
+ $(INSTALL_DATA) "$$d$$f" "$$helpdir`basename $$f`" || exit 1; \
+ done
+ @for f in $(HELP_MEDIA); do \
+ for lc in C $(_HELP_LINGUAS); do \
+ if test -f "$$lc$$f"; then d=; else d="$(srcdir)/"; fi; \
+ helpdir="$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)/"; \
+ mdir=`dirname "$$f"`; \
+ if test "x$mdir" = "x."; then mdir=""; fi; \
+ if ! test -d "$$helpdir$$mdir"; then $(mkinstalldirs) "$$helpdir$$mdir"; fi; \
+ if test -f "$$d$$lc/$$f"; then \
+ echo "$(INSTALL_DATA) $$d$$lc/$$f $$helpdir$$f"; \
+ $(INSTALL_DATA) "$$d$$lc/$$f" "$$helpdir$$f" || exit 1; \
+ elif test "x$$lc" != "xC"; then \
+ if test "x$(YELP_LC_MEDIA_LINKS)" != "x"; then \
+ echo "$(LN_S) -f $(HELP_DIR)/C/$(HELP_ID)/$$f $$helpdir$$f"; \
+ $(LN_S) -f "$(HELP_DIR)/C/$(HELP_ID)/$$f" "$$helpdir$$f" || exit 1; \
+ fi; \
+ fi; \
+ done; \
+ done
+
+.PHONY: uninstall-help
+uninstall-am: $(if $(HELP_ID),uninstall-help)
+uninstall-help:
+ for lc in C $(_HELP_LINGUAS); do for f in $(HELP_FILES); do \
+ helpdir="$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)/"; \
+ echo "rm -f $$helpdir`basename $$f`"; \
+ rm -f "$$helpdir`basename $$f`"; \
+ done; done
+ @for f in $(_HELP_C_EXTRA); do \
+ lc=`dirname "$$f"`; lc=`basename "$$lc"`; \
+ helpdir="$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)/"; \
+ echo "rm -f $$helpdir`basename $$f`"; \
+ rm -f "$$helpdir`basename $$f`"; \
+ done
+ @for f in $(HELP_MEDIA); do \
+ for lc in C $(_HELP_LINGUAS); do \
+ helpdir="$(DESTDIR)$(HELP_DIR)/$$lc/$(HELP_ID)/"; \
+ echo "rm -f $$helpdir$$f"; \
+ rm -f "$$helpdir$$f"; \
+ done; \
+ done;
+'
+AC_SUBST([YELP_HELP_RULES])
+m4_ifdef([_AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE([YELP_HELP_RULES])])
+])
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