[libgda] Detect when GObjectIntrospection is not correctly installed

[Vivien Malerba <vivien src gnome org>]

commit fd6b1660fc9bb7d4c31fbce906806675d0d3fbc1
Author: Vivien Malerba <malerba gnome-db org>
Date:   Fri Sep 24 21:23:32 2010 +0200

    Detect when GObjectIntrospection is not correctly installed

 introspection.m4 |   27 +++++++++++++++++----------
 1 files changed, 17 insertions(+), 10 deletions(-)
---
diff --git a/introspection.m4 b/introspection.m4
index 91b9051..f11f5f4 100644
--- a/introspection.m4
+++ b/introspection.m4
@@ -53,17 +53,24 @@ m4_define([_GOBJECT_INTROSPECTION_CHECK_INTERNAL],
     INTROSPECTION_GENERATE=
     INTROSPECTION_GIRDIR=
     INTROSPECTION_TYPELIBDIR=
+    introspection_makefile=`$PKG_CONFIG --variable=datadir gobject-introspection-1.0`/gobject-introspection-1.0/Makefile.introspection
     if test "x$found_introspection" = "xyes"; then
-       INTROSPECTION_SCANNER=`$PKG_CONFIG --variable=g_ir_scanner gobject-introspection-1.0`
-       INTROSPECTION_COMPILER=`$PKG_CONFIG --variable=g_ir_compiler gobject-introspection-1.0`
-       INTROSPECTION_GENERATE=`$PKG_CONFIG --variable=g_ir_generate gobject-introspection-1.0`
-       INTROSPECTION_GIRDIR=`$PKG_CONFIG --variable=girdir gobject-introspection-1.0`
-       INTROSPECTION_GIRDIR=${INTROSPECTION_GIRDIR/$datadir/\$(datadir)}
-       INTROSPECTION_TYPELIBDIR="$($PKG_CONFIG --variable=typelibdir gobject-introspection-1.0)"
-       INTROSPECTION_TYPELIBDIR=${INTROSPECTION_TYPELIBDIR/$libdir/\$(libdir)}
-       INTROSPECTION_CFLAGS=`$PKG_CONFIG --cflags gobject-introspection-1.0`
-       INTROSPECTION_LIBS=`$PKG_CONFIG --libs gobject-introspection-1.0`
-       INTROSPECTION_MAKEFILE=`$PKG_CONFIG --variable=datadir gobject-introspection-1.0`/gobject-introspection-1.0/Makefile.introspection
+        AC_MSG_CHECKING([if gobject-introspection is correctly installed])
+        if test -f $introspection_makefile; then
+            INTROSPECTION_SCANNER=`$PKG_CONFIG --variable=g_ir_scanner gobject-introspection-1.0`
+            INTROSPECTION_COMPILER=`$PKG_CONFIG --variable=g_ir_compiler gobject-introspection-1.0`
+            INTROSPECTION_GENERATE=`$PKG_CONFIG --variable=g_ir_generate gobject-introspection-1.0`
+            INTROSPECTION_GIRDIR=`$PKG_CONFIG --variable=girdir gobject-introspection-1.0`
+            INTROSPECTION_GIRDIR=${INTROSPECTION_GIRDIR/$datadir/\$(datadir)}
+            INTROSPECTION_TYPELIBDIR="$($PKG_CONFIG --variable=typelibdir gobject-introspection-1.0)"
+            INTROSPECTION_TYPELIBDIR=${INTROSPECTION_TYPELIBDIR/$libdir/\$(libdir)}
+            INTROSPECTION_CFLAGS=`$PKG_CONFIG --cflags gobject-introspection-1.0`
+            INTROSPECTION_LIBS=`$PKG_CONFIG --libs gobject-introspection-1.0`
+            INTROSPECTION_MAKEFILE=$introspection_makefile
+        else
+           found_introspection=no
+        fi
+        AC_MSG_RESULT([$found_introspection])
     fi
     AC_SUBST(INTROSPECTION_SCANNER)
     AC_SUBST(INTROSPECTION_COMPILER)