From a28cc8413b68bec5b4cf2ee5f37b40a8965490a5 Mon Sep 17 00:00:00 2001
From: Alexander Kanavin <alex.kanavin@gmail.com>
Date: Mon, 19 Oct 2015 18:29:21 +0300
Subject: [PATCH] configure.ac: add host-gi, gi-cross-wrapper, gi-ldd-wrapper
 and introspection-data options

With the first option, gobject-introspection tools (g-ir-doc-tool and g-ir-scanner)
that are already installed in the host system will be used for building the source tree.

With the second option, g-ir-scanner will be instructed to use an executable
wrapper to run binaries it's producing, and g-ir-compiler will be run
through the same wrapper (host system's g-ir-compiler cannot be used because
it's producing architecture-specific output).

With the third option, giscanner will be instructed to use a special ldd
command instead of system's ldd (which does not work when the binary to inspect
is compiled for a different architecture).

With the fourth option, it is possible to disable building of introspection data
(.gir and .typelib files), which may be difficult or impossible in cross-compilation
environments, because of lack of emulation (or native hardware) for the target architecture
on which the target binaries can be run.

These options are useful when cross-compiling for a different target architecture.

Upstream-Status: Pending [review on oe-core list]
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>

---
 Makefile.am       |  2 ++
 common.mk         | 39 +++++++++++++++++++++++++++++++++++++++
 configure.ac      | 42 ++++++++++++++++++++++++++++++++++++++++++
 tests/Makefile.am |  5 ++++-
 4 files changed, 87 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 44ed115..2a1fa56 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -21,7 +21,9 @@ include Makefile-cmph.am
 include Makefile-girepository.am
 include Makefile-giscanner.am
 include Makefile-examples.am
+if BUILD_INTROSPECTION_DATA
 include Makefile-gir.am
+endif
 include Makefile-tools.am
 
 ## Process this file with automake to produce Makefile.in
diff --git a/common.mk b/common.mk
index e26c637..9f3a65f 100644
--- a/common.mk
+++ b/common.mk
@@ -6,6 +6,15 @@
 # module itself.
 #
 
+if USE_HOST_GI
+INTROSPECTION_SCANNER = \
+    env PATH="$(PATH)" \
+        LPATH=.libs \
+        CC="$(CC)" \
+        PYTHONPATH=$(top_builddir):$(top_srcdir) \
+        UNINSTALLED_INTROSPECTION_BUILDDIR=$(top_builddir) \
+        g-ir-scanner
+else
 INTROSPECTION_SCANNER = \
     env PATH=".libs:$(PATH)" \
         LPATH=.libs \
@@ -14,9 +23,24 @@ INTROSPECTION_SCANNER = \
         UNINSTALLED_INTROSPECTION_SRCDIR=$(top_srcdir) \
         UNINSTALLED_INTROSPECTION_BUILDDIR=$(top_builddir) \
         $(top_builddir)/g-ir-scanner
+endif
+
+if USE_CROSS_WRAPPER
+CROSS_WRAPPER_ARG = --use-binary-wrapper=$(GI_CROSS_WRAPPER)
+else
+CROSS_WRAPPER_ARG =
+endif
+
+if USE_LDD_WRAPPER
+LDD_WRAPPER_ARG = --use-ldd-wrapper=$(GI_LDD_WRAPPER)
+else
+LDD_WRAPPER_ARG =
+endif
 
 INTROSPECTION_SCANNER_ARGS = \
     --verbose \
+    $(CROSS_WRAPPER_ARG) \
+    $(LDD_WRAPPER_ARG) \
     -I$(top_srcdir) \
     --add-include-path=$(srcdir) \
     --add-include-path=$(top_srcdir)/gir \
@@ -24,9 +48,15 @@ INTROSPECTION_SCANNER_ARGS = \
     --add-include-path=$(top_builddir) \
     --add-include-path=$(top_builddir)/gir
 
+if USE_CROSS_WRAPPER
+INTROSPECTION_COMPILER = \
+    env PATH=".libs:$(PATH)" \
+        $(GI_CROSS_WRAPPER) $(top_builddir)/.libs/g-ir-compiler$(EXEEXT)
+else
 INTROSPECTION_COMPILER = \
     env PATH=".libs:$(PATH)" \
         $(top_builddir)/g-ir-compiler$(EXEEXT)
+endif
 
 INTROSPECTION_COMPILER_ARGS = \
     --includedir=$(srcdir) \
@@ -35,6 +65,14 @@ INTROSPECTION_COMPILER_ARGS = \
     --includedir=$(top_builddir) \
     --includedir=$(top_builddir)/gir
 
+if USE_HOST_GI
+INTROSPECTION_DOCTOOL = \
+    env PATH="$(PATH)" \
+        LPATH=.libs \
+        PYTHONPATH=$(top_builddir):$(top_srcdir) \
+        UNINSTALLED_INTROSPECTION_BUILDDIR=$(top_builddir) \
+        g-ir-doc-tool
+else
 INTROSPECTION_DOCTOOL = \
     env PATH=".libs:$(PATH)" \
         LPATH=.libs \
@@ -42,6 +80,7 @@ INTROSPECTION_DOCTOOL = \
         UNINSTALLED_INTROSPECTION_SRCDIR=$(top_srcdir) \
         UNINSTALLED_INTROSPECTION_BUILDDIR=$(top_builddir) \
         $(top_builddir)/g-ir-doc-tool
+endif
 
 INTROSPECTION_DOCTOOL_ARGS = \
     --add-include-path=$(srcdir) \
diff --git a/configure.ac b/configure.ac
index d48e6c3..ed5f8a2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -367,6 +367,48 @@ dnl
 AM_CONDITIONAL(MSVC_BASE_NO_TOOLSET_SET, [test x$MSVC_BASE_TOOLSET = x])
 AM_CONDITIONAL(MSVC_NO_TOOLSET_SET, [test x$MSVC_TOOLSET = x])
 
+AC_ARG_ENABLE([host-gi],
+[AS_HELP_STRING([--enable-host-gi],[Use gobject introspection tools installed in the host system (useful when cross-compiling)])],
+[case "${enableval}" in
+  yes) host_gi=true ;;
+  no)  host_gi=false ;;
+  *) AC_MSG_ERROR([bad value ${enableval} for --enable-host-gi]) ;;
+esac],[host_gi=false])
+AM_CONDITIONAL([USE_HOST_GI], [test x$host_gi = xtrue])
+
+AC_ARG_ENABLE([gi-cross-wrapper],
+[AS_HELP_STRING([--enable-gi-cross-wrapper=path],[Use a wrapper to run gicompiler and binaries produced by giscanner (useful when cross-compiling)])],
+[
+GI_CROSS_WRAPPER="${enableval}"
+use_wrapper=true
+],[
+GI_CROSS_WRAPPER=""
+use_wrapper=false
+])
+AC_SUBST(GI_CROSS_WRAPPER)
+AM_CONDITIONAL([USE_CROSS_WRAPPER], [test x$use_wrapper = xtrue])
+
+AC_ARG_ENABLE([gi-ldd-wrapper],
+[AS_HELP_STRING([--enable-gi-ldd-wrapper=path],[Use a ldd wrapper instead of system's ldd command in giscanner (useful when cross-compiling)])],
+[
+GI_LDD_WRAPPER="${enableval}"
+use_ldd_wrapper=true
+],[
+GI_LDD_WRAPPER=""
+use_ldd_wrapper=false
+])
+AC_SUBST(GI_LDD_WRAPPER)
+AM_CONDITIONAL([USE_LDD_WRAPPER], [test x$use_ldd_wrapper = xtrue])
+
+AC_ARG_ENABLE([introspection-data],
+[AS_HELP_STRING([--enable-introspection-data],[Build introspection data (.gir and .typelib files) in addition to library and tools])],
+[case "${enableval}" in
+  yes) introspection_data=true ;;
+  no)  introspection_data=false ;;
+  *) AC_MSG_ERROR([bad value ${enableval} for --enable-introspection-data]) ;;
+esac],[introspection_data=true])
+AM_CONDITIONAL([BUILD_INTROSPECTION_DATA], [test x$introspection_data = xtrue])
+
 AC_CONFIG_FILES([
 Makefile
 tests/Makefile
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 4bdb9c3..10b0f27 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,6 +1,9 @@
 include $(top_srcdir)/common.mk
 
-SUBDIRS = . scanner repository offsets warn
+SUBDIRS = . scanner repository warn
+if BUILD_INTROSPECTION_DATA
+SUBDIRS += offsets
+endif
 
 EXTRA_DIST=
 BUILT_SOURCES=
