PR c/2098

        * c-common.c (shorten_compare): Simplfy conditions leading to
        the generation of a warning.

	* gcc.dg/compare6.c: New.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@52778 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 13 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/compare6.c b/gcc/testsuite/gcc.dg/compare6.c
new file mode 100644
index 00000000000..fbeb6a0aedd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/compare6.c
@@ -0,0 +1,13 @@
+/* PR c/2098 */
+/* Test for a warning on comparison on out-of-range data.  */
+/* { dg-do compile { xfail c4x-*-* } } */
+/* { dg-options "-Wall" } */
+
+signed char sc;
+unsigned char uc;
+
+void foo()
+{
+  if (sc == 10000) return; /* { dg-warning "always false" "signed" } */
+  if (uc == 10000) return; /* { dg-warning "always false" "unsigned" } */
+}