[4.9] Switch gcc-4.9 to use google/gcc-4_9 branch.

This source drop uses svn version r212828 of google/gcc-4.9 branch.
We also cherry-picked r213062, r213063 and r213064 to fix windows
build issues.
All gcc-4.9 patches before July 3rd are ported to google/gcc-4.9.
The following prior commits has not been merged to google branch yet.
(They are included in this commit).
e7af147f979e657fe2df00808e5b4319b0e088c6,
baf87df3cb2683649ba7e9872362a7e721117c23, and
c231900e5dcc14d8296bd9f62b45997a49d4d5e7.

Change-Id: I4bea3ea470387ff751c2be4cb0d4a12059b9299b

1 files changed, 34 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/torture/pr56965-2.c b/gcc-4.9/gcc/testsuite/gcc.dg/torture/pr56965-2.c
new file mode 100644
index 000000000..04f55914e
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/torture/pr56965-2.c
@@ -0,0 +1,34 @@
+extern void abort (void);
+
+struct S { int i; int j; };
+struct X { struct S s; int k; };
+struct Y { int k; struct S s; };
+union U { struct X x; struct Y y; } __attribute__((may_alias));
+
+int __attribute__((noinline))
+foo (union U *p, union U *q)
+{
+  p->x.s.j = 1;
+  q->y.s.i = 0;
+  return p->x.s.j;
+}
+
+struct R { int i; int j; } __attribute__((may_alias));
+
+int __attribute__((noinline))
+bar (struct R *p, struct R *q)
+{
+  p->i = 1;
+  q->j = 0;
+  return p->i;
+}
+
+int main()
+{
+  int a[3];
+  if (foo ((union U *)&a[0], (union U *)&a[0]) != 0)
+    abort ();
+  if (bar ((struct R *)&a[1], (struct R *)&a[0]) != 0)
+    abort ();
+  return 0;
+}