obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 42 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/execute/20000917-1.c b/gcc/testsuite/gcc.c-torture/execute/20000917-1.c
new file mode 100644
index 000000000..05b00ffe6
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20000917-1.c
@@ -0,0 +1,42 @@
+/* This bug exists in gcc-2.95, egcs-1.1.2, gcc-2.7.2 and probably
+   every other version as well.  */
+
+typedef struct int3 { int a, b, c; } int3;
+
+int3
+one (void)
+{
+  return (int3) { 1, 1, 1 };
+}
+
+int3
+zero (void)
+{
+  return (int3) { 0, 0, 0 };
+}
+
+int
+main (void)
+{
+  int3 a;
+
+  /* gcc allocates a temporary for the inner expression statement
+     to store the return value of `one'.
+
+     gcc frees the temporaries for the inner expression statement.
+
+     gcc realloates the same temporary slot to store the return
+     value of `zero'.
+
+     gcc expands the call to zero ahead of the expansion of the
+     statement expressions.  The temporary gets the value of `zero'.
+
+     gcc expands statement expressions and the stale temporary is
+     clobbered with the value of `one'.  The bad value is copied from
+     the temporary into *&a.  */
+
+  *({ ({ one (); &a; }); }) = zero ();
+  if (a.a && a.b && a.c)
+    abort ();
+  exit (0);
+}