[Pixman] [PATCH] Workaround bug in llvm-gcc

[Andrea Canciani]

llvm-gcc (shipped in Apple XCode 4.1.1) as the default compiler
performs an invalid optimization which unifies the empty_region and
the bad_region structures because they have the same content.

A bug has been filed against Apple Developers Tool for this
issue. This commit works around this bug by making the content of the
two structures different.

Fixes region-contains-test.
---
 pixman/pixman-region.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/pixman/pixman-region.c b/pixman/pixman-region.c
index 9ff5157..9074fe4 100644
--- a/pixman/pixman-region.c
+++ b/pixman/pixman-region.c
@@ -102,7 +102,7 @@
 
 static const box_type_t PREFIX (_empty_box_) = { 0, 0, 0, 0 };
 static const region_data_type_t PREFIX (_empty_data_) = { 0, 0 };
-static const region_data_type_t PREFIX (_broken_data_) = { 0, 0 };
+static const region_data_type_t PREFIX (_broken_data_) = { -1, 0 };
 
 static box_type_t *pixman_region_empty_box =
     (box_type_t *)&PREFIX (_empty_box_);
-- 
1.7.4.4