[empathy] Make parallel builds work

[Debarshi Ray <debarshir src gnome org>]

commit f1ab42c0c5332e47b33ecf905afd7fd6c2a344e8
Author: Debarshi Ray <debarshir src gnome org>
Date:   Fri Nov 30 19:29:13 2012 +0100

    Make parallel builds work
    
    There is no need to execute glib-ginterface-gen.py twice because it
    generates both the .c and .h files in one shot. Therefore, merely
    having one of them (say the .c) depend on the other (say the .h) is
    enough.
    
    Moreover, running it twice breaks parallel builds because one
    glib-ginterface-gen.py process steps on the other.
    
    Based on a suggestion from Ryan Lortie.
    
    Fixes: https://bugzilla.gnome.org/688132

 extensions/Makefile.am |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/extensions/Makefile.am b/extensions/Makefile.am
index bc42133..65f2f5e 100644
--- a/extensions/Makefile.am
+++ b/extensions/Makefile.am
@@ -108,7 +108,17 @@ _gen/cli-misc-body.h _gen/cli-misc.h: _gen/misc.xml \
 		--tp-proxy-api=0.10.0 \
 		$< Emp_Cli _gen/cli-misc
 
-_gen/svc-misc.c _gen/svc-misc.h: _gen/misc.xml \
+# There is no need to execute glib-ginterface-gen.py twice because it
+# generates both the .c and .h files in one shot. Therefore, merely
+# having one of them (say the .c) depend on the other (say the .h) is
+# enough.
+#
+# Moreover, running it twice breaks parallel builds because one
+# glib-ginterface-gen.py process steps on the other.
+
+_gen/svc-misc.c: _gen/svc-misc.h
+
+_gen/svc-misc.h: _gen/misc.xml \
 	$(tools_dir)/glib-ginterface-gen.py
 	$(AM_V_GEN)$(PYTHON) $(tools_dir)/glib-ginterface-gen.py \
 		--filename=_gen/svc-misc \