[gtk+] gtkx: Warn if we include gtkx.h during GTK compilation

[Benjamin Otte <otte src gnome org>]

commit 0be93f8e860bbaa7216de8e5ebe25529f099dd39
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jul 12 05:29:54 2014 +0200

    gtkx: Warn if we include gtkx.h during GTK compilation

 gtk/Makefile.am    |    2 +-
 gtk/gtktestutils.c |    9 ++++++++-
 gtk/gtkx.h         |    4 ++++
 3 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index f974723..531b315 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1450,7 +1450,7 @@ gtkprivatetypebuiltins.c: $(gtk_private_type_h_sources)  gtkprivatetypebuiltins.
 
 
 gtktypefuncs.c: stamp-gtktypebuiltins.h stamp-gtkprivatetypebuiltins.h $(top_srcdir)/gtk/*.h 
$(top_srcdir)/gtk/a11y/*.h $(top_srcdir)/gtk/deprecated/*.h $(top_srcdir)/gdk/*.h Makefile
-       $(AM_V_GEN) echo '#include <gtk/gtkx.h>' > xgen-gtfsrc.c && \
+       $(AM_V_GEN) (echo '#undef GTK_COMPILATION' && echo '#include <gtk/gtkx.h>') > xgen-gtfsrc.c && \
          echo 'G_GNUC_BEGIN_IGNORE_DEPRECATIONS' > xgen-gtf && \
          ${CPP} $(DEFS) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) xgen-gtfsrc.c | \
          $(GREP) -o '\bg[td]k_[a-zA-Z0-9_]*_get_type\b' | \
diff --git a/gtk/gtktestutils.c b/gtk/gtktestutils.c
index fa00678..b96a828 100644
--- a/gtk/gtktestutils.c
+++ b/gtk/gtktestutils.c
@@ -19,7 +19,6 @@
 
 #include "config.h"
 
-#include <gtk/gtkx.h>
 #include "gtkspinbutton.h"
 #include "gtkmain.h"
 #include "gtkbox.h"
@@ -32,6 +31,14 @@
 #include <string.h>
 #include <math.h>
 
+/* This is a hack.
+ * We want to include the same headers as gtktypefuncs.c but we are not
+ * allowed to include gtkx.h directly during GTK compilation.
+ * So....
+ */
+#undef GTK_COMPILATION
+#include <gtk/gtkx.h>
+#define GTK_COMPILATION
 
 /**
  * SECTION:gtktesting
diff --git a/gtk/gtkx.h b/gtk/gtkx.h
index 10f3dfa..e5d2531 100644
--- a/gtk/gtkx.h
+++ b/gtk/gtkx.h
@@ -18,6 +18,10 @@
 #ifndef __GTK_X_H__
 #define __GTK_X_H__
 
+#if defined (GTK_COMPILATION)
+#error "<gtk/gtkx.h> must not be included by GTK+ headers."
+#endif
+
 #define __GTKX_H_INSIDE__
 
 #include <gtk/gtk.h>