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, 54 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c b/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c
new file mode 100644
index 000000000..df706e577
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/sequence-pt-pr17880.c
@@ -0,0 +1,54 @@
+/* PR 17880 */
+/* { dg-do compile } */
+/* { dg-options "-Wsequence-point" } */
+
+int
+foo (int x)
+{
+  unsigned int a;
+  int b;
+
+  b = (a += 5) > a;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = (a += 5) + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = (a -= 5) > a;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = (a -= 5) + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = a-- > a;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = a-- + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = ++a > a;  /* { dg-warning "undefined" "sequence point warning" } */
+  b = ++a + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
+
+  if ((a += 5) > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if ((a += 5) + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if ((a -= 5) > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if ((a -= 5) + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if (a-- > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if (a-- + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if (++a > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  if (++a + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
+  do {} while ((a += 5) > a);  /* { dg-warning "undefined" "sequence point warning" } */
+  while ((a += 5) > a);  /* { dg-warning "undefined" "sequence point warning" } */
+  for ((a += 5) > a;;);  /* { dg-warning "undefined" "sequence point warning" } */
+  for (b = (a += 5) > a;;);  /* { dg-warning "undefined" "sequence point warning" } */
+  for (; (a += 5) > a;);  /* { dg-warning "undefined" "sequence point warning" } */
+  for (;; b = (a += 5) > a);  /* { dg-warning "undefined" "sequence point warning" } */
+  for (;; a++ + a++);  /* { dg-warning "undefined" "sequence point warning" } */
+  if (a) a++ - a--;    /* { dg-warning "undefined" "sequence point warning" } */
+  ((a +=5) > a) ? a : b; /* { dg-warning "undefined" "sequence point warning" } */
+  return (a++ - a--); /* { dg-warning "undefined" "sequence point warning" } */
+}
+
+void bar (int i)
+{
+  int a = i++ - i++; /* { dg-warning "undefined" "sequence point warning" } */
+} 
+
+void baz (int i)
+{
+  switch (i++ + i++)  /* { dg-warning "undefined" "sequence point warning" } */
+    {
+    case 1:
+      i++ - i++;  /* { dg-warning "undefined" "sequence point warning" } */
+    case 2:
+      break;
+    }
+}