re PR c++/56607 (GCC fails to warn on division by zero)

	PR c++/56607
	* typeck.c (cp_build_binary_op): When calling warn_for_div_by_zero,
	pass op1 through maybe_constant_value first.

	* g++.dg/warn/Wdiv-by-zero-2.C: New test.
	* c-c++-common/pr56607.c: New test.

From-SVN: r196704

1 files changed, 29 insertions, 0 deletions

diff --git a/gcc/testsuite/c-c++-common/pr56607.c b/gcc/testsuite/c-c++-common/pr56607.c
new file mode 100644
index 0000000..d7faa81
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr56607.c
@@ -0,0 +1,29 @@
+/* PR c++/56607 */
+/* { dg-do compile { target { { lp64 || ilp32 } || llp64 } } } */
+/* { dg-options "-O2 -Wdiv-by-zero" } */
+
+int
+f1 (void)
+{
+  return 1 / (sizeof (char) - 1);	/* { dg-warning "division by zero" } */
+}
+
+int
+f2 (void)
+{
+  const int x = sizeof (char) - 1;
+  return 1 / x;				/* { dg-warning "division by zero" "" { target c++ } } */
+}
+
+int
+f3 (void)
+{
+  return 1 / (sizeof (int) / 3 - 1);	/* { dg-warning "division by zero" } */
+}
+
+int
+f4 (void)
+{
+  const int x = sizeof (int) / 3 - 1;
+  return 1 / x;				/* { dg-warning "division by zero" "" { target c++ } } */
+}