[gobject-introspection] build: Add an autotools module for introspection builds on MSVC

[Chun-wei Fan <fanchunwei src gnome org>]

commit c5a01593bd08ffe9b5a380c0a2632083bf82f121
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Oct 5 15:12:17 2015 +0800

    build: Add an autotools module for introspection builds on MSVC
    
    This adds an autotools module that can be included in projects to be
    used for generating the command lines for g-ir-scanner and
    g-ir-compiler for introspection builds on Visual Studio builds.
    
    This is currently not used directly in the MSVC builds of g-i, but
    is added here as other modules are directly to get this file from
    here (i.e. $(srcroot)/build) for inclusion in their Makefile.am's
    to support introspection builds for modules that support Visual
    Studio builds.

 build/Makefile.am                 |    5 +-
 build/Makefile.msvc-introspection |  125 +++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+), 2 deletions(-)
---
diff --git a/build/Makefile.am b/build/Makefile.am
index 89490d1..5564120 100644
--- a/build/Makefile.am
+++ b/build/Makefile.am
@@ -9,5 +9,6 @@ EXTRA_DIST =    \
        gi_msvc_build_utils.py          \
        gi-setenv-msvc.mak              \
        gi-tests-msvc.mak               \
-       introspection-msvc.mak  \
-       replace.py
+       introspection-msvc.mak          \
+       replace.py                      \
+       Makefile.msvc-introspection
diff --git a/build/Makefile.msvc-introspection b/build/Makefile.msvc-introspection
new file mode 100644
index 0000000..9c3a14a
--- /dev/null
+++ b/build/Makefile.msvc-introspection
@@ -0,0 +1,125 @@
+# Author: Fan, Chun-wei
+# Common autotools file for constructing the g-ir-scanner and
+# g-ir-compiler command lines for Visual Studio builds.
+
+# This is copied from $(srcroot)/build from the gobject-introspection
+# project, which may be included in projects that support both
+# Visual Studio builds and introspection.
+
+# * Input variables:
+#
+#   MSVC_INTROSPECT_GIRS - List of .gir's that should be built
+#                          in the NMake Makefiles
+#
+# * Simple tutorial
+#
+# Add this to Makefile.am where your library/program is built:
+#   (Either YourLib_1_0_gir_MSVC_LIBS or YourLib_1_0_gir_MSVC_PROGRAM
+#    is required unless --headers-only is specified in
+#    YourLib_1_0_gir__MSVC_SCANNERFLAGS)
+#
+#   include $(top_srcdir)/build/Makefile.msvc-introspection
+#   MSVC_INTROSPECT_GIRS = YourLib-1.0.gir
+#   YourLib_1_0_gir_NAMESPACE = YourLib # This is optional
+#   YourLib_1_0_gir_VERSION = 1.0 # This is optional
+#   YourLib_1_0_gir_MSVC_LIBS = yourlib-1.0
+#   YourLib_1_0_gir_MSVC_FILES = $(libyourlib_1_0_SOURCES)
+#   YourLib_1_0_gir_MSVC_PROGRAM = YourProgram
+#   YourLib_1_0_gir_MSVC_PACKAGES = (Dependent .pc files)
+#   YourLib_1_0_gir_MSVC_INCLUDE_GIRS = (Dependent external .gir's)
+#   YourLiv_1_0_gir_MSVC_EXPORT_PACKAGES = (Packages exported by this .gir)
+
+# Private functions
+
+## Transform the MSVC project filename (no filename extensions) to something which can reference through a 
variable
+## without automake/make complaining, eg Gtk-2.0 -> Gtk_2_0
+_gir_name=$(subst /,_,$(subst -,_,$(subst .,_,$(1))))
+
+# Namespace and Version is either fetched from the gir filename
+# or the _NAMESPACE/_VERSION variable combo
+_gir_namespace_msvc = $(or $($(_gir_name)_NAMESPACE),$(firstword $(subst -, ,$(notdir $(1)))))
+_gir_version_msvc = $(or $($(_gir_name)_VERSION),$(lastword $(subst -, ,$(1:.gir=))))
+_typelib_basename_msvc = $(_gir_namespace_msvc)'-'$(_gir_version_msvc)
+
+# _PROGRAM is an optional variable which needs its own --program argument
+_gir_program_msvc = $(if $($(_gir_name)_MSVC_PROGRAM),--program=$($(_gir_name)_MSVC_PROGRAM))
+
+# Deduce the sub-folder from $(srcroot) where the sources reside in
+_gir_source_path_raw_msvc:=$(subst $(abs_top_srcdir),,$(abs_srcdir))
+_gir_source_path_msvc=$(subst /,\\,$(_gir_source_path_raw_msvc))
+_gir_source_subdir_int_msvc=$(subst \\\\,\\,\\$(_gir_source_path_msvc)\\)
+_gir_source_subdir_msvc=$(subst \\.\\,\\,$(_gir_source_subdir_int_msvc))
+
+_gir_files_raw_msvc=$(subst /,\\,$($(_gir_name)_MSVC_FILES))
+_gir_files_msvc=$(subst $(srcdir)\\,,$(subst $(builddir)\\,,$(subst 
$(top_builddir)\\$(_gir_source_path_msvc)\\,\\,$(_gir_files_raw_msvc))))
+
+# Create a list of items for:
+# - Libraries
+# - Packages
+# - GIRs to include
+# - packages to export
+
+_gir_libraries_msvc = $(foreach lib,$($(_gir_name)_MSVC_LIBS),--library=$(lib))
+_gir_packages_msvc = $(foreach pkg,$($(_gir_name)_MSVC_PACKAGES),--pkg=$(pkg))
+_gir_includes_msvc = $(foreach include,$($(_gir_name)_MSVC_INCLUDE_GIRS),--include=$(include))
+_gir_export_packages_msvc = $(foreach pkg,$($(_gir_name)_MSVC_EXPORT_PACKAGES),--pkg-export=$(pkg))
+
+#
+# Create NMake Makefile Sections for Building Introspection files
+# from autotools files
+# $(1) - File Name of the .gir that is to be generated
+#
+
+define gir-nmake-builder
+
+# Basic sanity check, to make sure required variables are set
+$(if $($(_gir_name)_MSVC_FILES),,$(error Need to define $(_gir_name)_MSVC_FILES))
+$(if $(or $(findstring --header-only,$($(_gir_name)_MSVC_SCANNERFLAGS)),
+          $($(_gir_name)_MSVC_LIBS),
+          $($(_gir_name)_MSVC_PROGRAM)),,
+    $(error Need to define $(_gir_name)_MSVC_LIBS or $(_gir_name)_MSVC_PROGRAM))
+
+$(top_builddir)/build/win32/$(_gir_name)_list:
+       for F in $(_gir_files_msvc); do \
+               case $$$$F in \
+               *.c|*.cpp|*.cc|*.cxx|*.h|*.hpp|*.hh|*.hxx) \
+                       echo '..\..'$(_gir_source_subdir_msvc)$$$$F 
> > $(top_builddir)/build/win32/$(_gir_name)_list \
+                       ;; \
+               esac; \
+       done
+
+$(top_builddir)/build/win32/$(1).msvc.introspect:
+       -$(RM) $(top_builddir)/build/win32/$(1).msvc.introspect
+
+# Assemble the Command to Run g-ir-scanner
+       echo $(1)': '$(_gir_name)'_list 
'$($(_gir_name)_MSVC_GIR_DEPS)>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  @-echo Generating $$$$    '>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  $$$$(PYTHON2) $$$$(G_IR_SCANNER)        \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --verbose -no-libtool   \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --namespace='$(_gir_namespace_msvc)'    \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --nsversion='$(_gir_version_msvc)'      \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$(_gir_packages_msvc)' \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$(_gir_libraries_msvc)'        \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$(_gir_program_msvc)'  \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --add-include-path=$$$$(G_IR_INCLUDEDIR)        
\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$(_gir_includes_msvc)' \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$(_gir_export_packages_msvc)'  \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --cflags-begin  \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$($(_gir_name)_MSVC_CFLAGS)'   \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --cflags-end    \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$($(_gir_name)_MSVC_SCANNERFLAGS)'     \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --filelist='$(_gir_name)'_list  \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  -o $$$$@'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '' >>$(top_builddir)/build/win32/$(1).msvc.introspect
+
+# Finally Assemble the Command to Compile the generated .gir
+       echo '$(_typelib_basename_msvc).typelib: 
'$(_typelib_basename_msvc)'.gir'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  @-echo Compiling $$$$    '>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  $$$$(G_IR_COMPILER)     \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  --includedir=. --debug --verbose        \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  '$(1)'  \'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '  -o $$$$@'>>$(top_builddir)/build/win32/$(1).msvc.introspect
+       echo '' >>$(top_builddir)/build/win32/$(1).msvc.introspect
+endef
+
+$(foreach gir,$(MSVC_INTROSPECT_GIRS),$(eval $(call gir-nmake-builder,$(gir))))