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[libmediaart/api-cleanup: 14/16] build: Improve warnings used when compiling

commit 733ce3f5ae97de8ef03552c1f225e4cd4851c59d
Author: Martyn Russell <martyn lanedo com>
Date:   Mon Jul 28 09:10:07 2014 +0100

    build: Improve warnings used when compiling
    
    Use CC_CHECK_FLAGS_APPEND m4 macro to make sure GCC supports flags
    
    This is after finding out that some platforms or versions of GCC don't
    support flags like -Wmaybe-uninitialized
    
    The attributes.m4 is stolen from systemd who stole it from xine-lib.

 configure.ac     |    5 +
 m4/.gitignore    |    1 +
 m4/attributes.m4 |  288 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 m4/local.m4      |  258 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 552 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 95a3b73..a0f7fb3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -96,6 +96,8 @@ AC_SUBST(LT_REVISION)
 AC_SUBST(LT_AGE)
 AC_SUBST(LT_CURRENT_MINUS_AGE)
 
+IDT_COMPILE_WARNINGS
+
 # Checks for programs.
 AC_PROG_CXX
 AC_PROG_AWK
@@ -151,6 +153,9 @@ PKG_CHECK_MODULES(LIBMEDIAART, [$LIBMEDIAART_REQUIRED])
 GLIB_GENMARSHAL=`$PKG_CONFIG glib-2.0 --variable=glib_genmarshal`
 AC_SUBST(GLIB_GENMARSHAL)
 
+GLIB_PREFIX="`$PKG_CONFIG --variable=prefix glib-2.0`"
+AC_SUBST(GLIB_PREFIX)
+
 ####################################################################
 # General CFLAGS/LIBS
 ####################################################################
diff --git a/m4/.gitignore b/m4/.gitignore
new file mode 100644
index 0000000..0f4126c
--- /dev/null
+++ b/m4/.gitignore
@@ -0,0 +1 @@
+*.m4
diff --git a/m4/attributes.m4 b/m4/attributes.m4
new file mode 100644
index 0000000..aa53ef2
--- /dev/null
+++ b/m4/attributes.m4
@@ -0,0 +1,288 @@
+dnl Macros to check the presence of generic (non-typed) symbols.
+dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes gmail com>
+dnl Copyright (c) 2006-2008 xine project
+dnl Copyright (c) 2012 Lucas De Marchi <lucas de marchi 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, or (at your option)
+dnl any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU 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., 51 Franklin Street, Fifth Floor, Boston, MA
+dnl 02110-1301, USA.
+dnl
+dnl As a special exception, the copyright owners of the
+dnl macro gives unlimited permission to copy, distribute and modify the
+dnl configure scripts that are the output of Autoconf when processing the
+dnl Macro. You need not follow the terms of the GNU General Public
+dnl License when using or distributing such scripts, even though portions
+dnl of the text of the Macro appear in them. The GNU General Public
+dnl License (GPL) does govern all other use of the material that
+dnl constitutes the Autoconf Macro.
+dnl
+dnl This special exception to the GPL applies to versions of the
+dnl Autoconf Macro released by this project. When you make and
+dnl distribute a modified version of the Autoconf Macro, you may extend
+dnl this special exception to the GPL to apply to your modified version as
+dnl well.
+
+dnl Check if FLAG in ENV-VAR is supported by compiler and append it
+dnl to WHERE-TO-APPEND variable
+dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
+
+AC_DEFUN([CC_CHECK_FLAG_APPEND], [
+  AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
+                 AS_TR_SH([cc_cv_$2_$3]),
+          [eval "AS_TR_SH([cc_save_$2])='${$2}'"
+           eval "AS_TR_SH([$2])='-Werror $3'"
+           AC_LINK_IFELSE([AC_LANG_SOURCE([int a = 0; int main(void) { return a; } ])],
+                          [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
+                          [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
+           eval "AS_TR_SH([$2])='$cc_save_$2'"])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes],
+        [eval "$1='${$1} $3'"])
+])
+
+dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
+AC_DEFUN([CC_CHECK_FLAGS_APPEND], [
+  for flag in $3; do
+    CC_CHECK_FLAG_APPEND($1, $2, $flag)
+  done
+])
+
+dnl Check if the flag is supported by linker (cacheable)
+dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+
+AC_DEFUN([CC_CHECK_LDFLAGS], [
+  AC_CACHE_CHECK([if $CC supports $1 flag],
+    AS_TR_SH([cc_cv_ldflags_$1]),
+    [ac_save_LDFLAGS="$LDFLAGS"
+     LDFLAGS="$LDFLAGS $1"
+     AC_LINK_IFELSE([int main() { return 1; }],
+       [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
+       [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
+     LDFLAGS="$ac_save_LDFLAGS"
+    ])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
+    [$2], [$3])
+])
+
+dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for
+dnl the current linker to avoid undefined references in a shared object.
+AC_DEFUN([CC_NOUNDEFINED], [
+  dnl We check $host for which systems to enable this for.
+  AC_REQUIRE([AC_CANONICAL_HOST])
+
+  case $host in
+     dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads
+     dnl are requested, as different implementations are present; to avoid problems
+     dnl use -Wl,-z,defs only for those platform not behaving this way.
+     *-freebsd* | *-openbsd*) ;;
+     *)
+        dnl First of all check for the --no-undefined variant of GNU ld. This allows
+        dnl for a much more readable commandline, so that people can understand what
+        dnl it does without going to look for what the heck -z defs does.
+        for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do
+           CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"])
+           break
+        done
+     ;;
+  esac
+
+  AC_SUBST([LDFLAGS_NOUNDEFINED])
+])
+
+dnl Check for a -Werror flag or equivalent. -Werror is the GCC
+dnl and ICC flag that tells the compiler to treat all the warnings
+dnl as fatal. We usually need this option to make sure that some
+dnl constructs (like attributes) are not simply ignored.
+dnl
+dnl Other compilers don't support -Werror per se, but they support
+dnl an equivalent flag:
+dnl  - Sun Studio compiler supports -errwarn=%all
+AC_DEFUN([CC_CHECK_WERROR], [
+  AC_CACHE_CHECK(
+    [for $CC way to treat warnings as errors],
+    [cc_cv_werror],
+    [CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror],
+      [CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])])
+    ])
+])
+
+AC_DEFUN([CC_CHECK_ATTRIBUTE], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))],
+    AS_TR_SH([cc_cv_attribute_$1]),
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE([$3])],
+       [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"],
+       [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"])
+     CFLAGS="$ac_save_CFLAGS"
+    ])
+
+  AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes],
+    [AC_DEFINE(
+       AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1,
+         [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))]
+         )
+     $4],
+    [$5])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [
+  CC_CHECK_ATTRIBUTE(
+    [constructor],,
+    [void __attribute__((constructor)) ctor() { int a; }],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_FORMAT], [
+  CC_CHECK_ATTRIBUTE(
+    [format], [format(printf, n, n)],
+    [void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [
+  CC_CHECK_ATTRIBUTE(
+    [format_arg], [format_arg(printf)],
+    [char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [
+  CC_CHECK_ATTRIBUTE(
+    [visibility_$1], [visibility("$1")],
+    [void __attribute__((visibility("$1"))) $1_function() { }],
+    [$2], [$3])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_NONNULL], [
+  CC_CHECK_ATTRIBUTE(
+    [nonnull], [nonnull()],
+    [void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; 
}],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_UNUSED], [
+  CC_CHECK_ATTRIBUTE(
+    [unused], ,
+    [void some_function(void *foo, __attribute__((unused)) void *bar);],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [
+  CC_CHECK_ATTRIBUTE(
+    [sentinel], ,
+    [void some_function(void *foo, ...) __attribute__((sentinel));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [
+  CC_CHECK_ATTRIBUTE(
+    [deprecated], ,
+    [void some_function(void *foo, ...) __attribute__((deprecated));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_ALIAS], [
+  CC_CHECK_ATTRIBUTE(
+    [alias], [weak, alias],
+    [void other_function(void *foo) { }
+     void some_function(void *foo) __attribute__((weak, alias("other_function")));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_MALLOC], [
+  CC_CHECK_ATTRIBUTE(
+    [malloc], ,
+    [void * __attribute__((malloc)) my_alloc(int n);],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_PACKED], [
+  CC_CHECK_ATTRIBUTE(
+    [packed], ,
+    [struct astructure { char a; int b; long c; void *d; } __attribute__((packed));],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_CONST], [
+  CC_CHECK_ATTRIBUTE(
+    [const], ,
+    [int __attribute__((const)) twopow(int n) { return 1 << n; } ],
+    [$1], [$2])
+])
+
+AC_DEFUN([CC_FLAG_VISIBILITY], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if $CC supports -fvisibility=hidden],
+    [cc_cv_flag_visibility],
+    [cc_flag_visibility_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden],
+     cc_cv_flag_visibility='yes',
+     cc_cv_flag_visibility='no')
+     CFLAGS="$cc_flag_visibility_save_CFLAGS"])
+
+  AS_IF([test "x$cc_cv_flag_visibility" = "xyes"],
+    [AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1,
+       [Define this if the compiler supports the -fvisibility flag])
+     $1],
+    [$2])
+])
+
+AC_DEFUN([CC_FUNC_EXPECT], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([if compiler has __builtin_expect function],
+    [cc_cv_func_expect],
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+       [int some_function() {
+        int a = 3;
+        return (int)__builtin_expect(a, 3);
+     }])],
+       [cc_cv_func_expect=yes],
+       [cc_cv_func_expect=no])
+     CFLAGS="$ac_save_CFLAGS"
+    ])
+
+  AS_IF([test "x$cc_cv_func_expect" = "xyes"],
+    [AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1,
+     [Define this if the compiler supports __builtin_expect() function])
+     $1],
+    [$2])
+])
+
+AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [
+  AC_REQUIRE([CC_CHECK_WERROR])
+  AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported],
+    [cc_cv_attribute_aligned],
+    [ac_save_CFLAGS="$CFLAGS"
+     CFLAGS="$CFLAGS $cc_cv_werror"
+     for cc_attribute_align_try in 64 32 16 8 4 2; do
+        AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+          int main() {
+            static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0;
+            return c;
+          }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break])
+     done
+     CFLAGS="$ac_save_CFLAGS"
+  ])
+
+  if test "x$cc_cv_attribute_aligned" != "x"; then
+     AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned],
+       [Define the highest alignment supported])
+  fi
+])
diff --git a/m4/local.m4 b/m4/local.m4
new file mode 100644
index 0000000..bca646d
--- /dev/null
+++ b/m4/local.m4
@@ -0,0 +1,258 @@
+dnl #########################################################################
+AC_DEFUN([AX_DOTS_TO_UNDERSCORES], [
+  $1[]_UNDERSCORES=`echo "$$1" | sed -e 's/\./_/g'`
+  AC_SUBST($1[]_UNDERSCORES)
+]) dnl AX_DOTS_TO_UNDERSCORES
+
+dnl #########################################################################
+AC_DEFUN([AX_COMPARE_VERSION], [
+  # Used to indicate true or false condition
+  ax_compare_version=false
+
+  # Convert the two version strings to be compared into a format that
+  # allows a simple string comparison.  The end result is that a version
+  # string of the form 1.12.5-r617 will be converted to the form
+  # 0001001200050617.  In other words, each number is zero padded to four
+  # digits, and non digits are removed.
+  AS_VAR_PUSHDEF([A],[ax_compare_version_A])
+  A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+                     -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/[[^0-9]]//g'`
+
+  AS_VAR_PUSHDEF([B],[ax_compare_version_B])
+  B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+                     -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/[[^0-9]]//g'`
+
+  dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
+  dnl # then the first line is used to determine if the condition is true.
+  dnl # The sed right after the echo is to remove any indented white space.
+  m4_case(m4_tolower($2),
+  [lt],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+  ],
+  [gt],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+  ],
+  [le],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+  ],
+  [ge],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+  ],[
+    dnl Split the operator from the subversion count if present.
+    m4_bmatch(m4_substr($2,2),
+    [0],[
+      # A count of zero means use the length of the shorter version.
+      # Determine the number of characters in A and B.
+      ax_compare_version_len_A=`echo "$A" | awk '{print(length)}'`
+      ax_compare_version_len_B=`echo "$B" | awk '{print(length)}'`
+
+      # Set A to no more than B's length and B to no more than A's length.
+      A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
+      B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
+    ],
+    [[0-9]+],[
+      # A count greater than zero means use only that many subversions
+      A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+      B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+    ],
+    [.+],[
+      AC_WARNING(
+        [illegal OP numeric parameter: $2])
+    ],[])
+
+    # Pad zeros at end of numbers to make same length.
+    ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
+    B="$B`echo $A | sed 's/./0/g'`"
+    A="$ax_compare_version_tmp_A"
+
+    # Check for equality or inequality as necessary.
+    m4_case(m4_tolower(m4_substr($2,0,2)),
+    [eq],[
+      test "x$A" = "x$B" && ax_compare_version=true
+    ],
+    [ne],[
+      test "x$A" != "x$B" && ax_compare_version=true
+    ],[
+      AC_WARNING([illegal OP parameter: $2])
+    ])
+  ])
+
+  AS_VAR_POPDEF([A])dnl
+  AS_VAR_POPDEF([B])dnl
+
+  dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
+  if test "$ax_compare_version" = "true" ; then
+    m4_ifvaln([$4],[$4],[:])dnl
+    m4_ifvaln([$5],[else $5])dnl
+  fi
+]) dnl AX_COMPARE_VERSION
+
+dnl #########################################################################
+dnl Turn on the additional warnings last, so -Werror doesn't affect other tests.
+AC_DEFUN([IDT_COMPILE_WARNINGS],[
+    if test -f $srcdir/autogen.sh; then
+       default_compile_warnings="maximum"
+    else
+       default_compile_warnings="no"
+    fi
+
+    AC_ARG_WITH(compile-warnings,
+                AS_HELP_STRING([--with-compile-warnings=@<:@no/yes/maximum/error@:>@],
+                               [Compiler warnings]),
+                [enable_compile_warnings="$withval"],
+                [enable_compile_warnings="$default_compile_warnings"])
+
+    warnCFLAGS=
+    if test "x$GCC" != xyes; then
+       enable_compile_warnings=no
+    fi
+
+    warning_cflags=
+    warning_valaflags=
+    realsave_CFLAGS="$CFLAGS"
+
+    # Everything from -Wall except:
+    # 1. the -Wunused-* stuff
+    # 2. the non C warnings: -Wreorder -Wc++11-compat
+    # 3. unfixable issues: -Wmissing-braces
+    #
+    # We don't want to see warnings about generated code.
+    CC_CHECK_FLAGS_APPEND([common_cflags], [CFLAGS], [\
+        -Waddress \
+        -Warray-bounds \
+        -Wchar-subscripts \
+        -Wenum-compare \
+        -Wimplicit-int \
+        -Wimplicit-function-declaration \
+        -Wcomment \
+        -Wformat \
+        -Wmain \
+        -Wmaybe-uninitialized \
+        -Wnonnull \
+        -Wparentheses \
+        -Wpointer-sign \
+        -Wreturn-type \
+        -Wsequence-point \
+        -Wsign-compare \
+        -Wstrict-aliasing \
+        -Wstrict-overflow=1 \
+        -Wswitch \
+        -Wtrigraphs \
+        -Wuninitialized \
+        -Wunknown-pragmas \
+        -Wvolatile-register-var \
+        ])
+
+    case "$enable_compile_warnings" in
+    no)
+       warning_cflags=
+       warning_valaflags=
+       ;;
+    yes)
+        CC_CHECK_FLAGS_APPEND([additional_cflags], [CFLAGS], [\
+            -Wall \
+            -Wunused \
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+        ])
+
+        CC_CHECK_FLAGS_APPEND([additional_valaflags], [CFLAGS], [\
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+        ])
+
+        dnl -Wall includes the $common_cflags already.
+       warning_cflags="$additional_cflags"
+       warning_valaflags="$common_cflags $additional_valaflags"
+       ;;
+    maximum|error)
+        CC_CHECK_FLAGS_APPEND([additional_cflags], [CFLAGS], [\
+            -Wall \
+            -Wunused \
+            -Wchar-subscripts \
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+            -Wnested-externs \
+            -Wpointer-arit \
+            -Wno-sign-compare \
+            -Wno-pointer-sign \
+        ])
+
+        CC_CHECK_FLAGS_APPEND([additional_valaflags], [CFLAGS], [\
+            -Wmissing-prototypes \
+            -Wmissing-declarations \
+            -Wnested-externs \
+            -Wpointer-arith \
+            -Wno-sign-compare \
+            -Wno-pointer-sign \
+        ])
+
+        dnl -Wall includes the $common_cflags already.
+       warning_cflags="$additional_cflags"
+       warning_valaflags="$common_cflags $additional_valaflags"
+
+       if test "$enable_compile_warnings" = "error" ; then
+           warning_cflags="$warning_cflags -Werror"
+           warning_valaflags="$warning_valaflags -Werror"
+       fi
+       ;;
+    *)
+       AC_MSG_ERROR(Unknown argument '$enable_compile_warnings' to --with-compile-warnings)
+       ;;
+    esac
+    CFLAGS="$realsave_CFLAGS"
+    AC_MSG_CHECKING(what warning flags to pass to the C compiler)
+    AC_MSG_RESULT($warning_cflags)
+
+    AC_MSG_CHECKING(what warning flags to pass to the C compiler for Vala built sources)
+    AC_MSG_RESULT($warning_valaflags)
+
+    WARN_CFLAGS="$warning_cflags"
+    AC_SUBST(WARN_CFLAGS)
+
+    WARN_VALACFLAGS="$warning_valaflags"
+    AC_SUBST(WARN_VALACFLAGS)
+]) dnl IDT_COMPILE_WARNINGS
+
+
+
+dnl Stolen from https://git.gnome.org/browse/glib/tree/m4macros/glibtests.m4
+
+dnl GLIB_TESTS
+dnl
+
+AC_DEFUN([GLIB_TESTS],
+[
+  AC_ARG_ENABLE(installed-tests,
+                AS_HELP_STRING([--enable-installed-tests],
+                               [Enable installation of some test cases]),
+                [case ${enableval} in
+                  yes) ENABLE_INSTALLED_TESTS="1"  ;;
+                  no)  ENABLE_INSTALLED_TESTS="" ;;
+                  *) AC_MSG_ERROR([bad value ${enableval} for --enable-installed-tests]) ;;
+                 esac])
+  AM_CONDITIONAL([ENABLE_INSTALLED_TESTS], test "$ENABLE_INSTALLED_TESTS" = "1")
+  AC_ARG_ENABLE(always-build-tests,
+                AS_HELP_STRING([--enable-always-build-tests],
+                               [Enable always building tests during 'make all']),
+                [case ${enableval} in
+                  yes) ENABLE_ALWAYS_BUILD_TESTS="1"  ;;
+                  no)  ENABLE_ALWAYS_BUILD_TESTS="" ;;
+                  *) AC_MSG_ERROR([bad value ${enableval} for --enable-always-build-tests]) ;;
+                 esac])
+  AM_CONDITIONAL([ENABLE_ALWAYS_BUILD_TESTS], test "$ENABLE_ALWAYS_BUILD_TESTS" = "1")
+  if test "$ENABLE_INSTALLED_TESTS" = "1"; then
+    AC_SUBST(installed_test_metadir, [${datadir}/installed-tests/]AC_PACKAGE_NAME)
+    AC_SUBST(installed_testdir, [${libexecdir}/installed-tests/]AC_PACKAGE_NAME)
+  fi
+])
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