re PR tree-optimization/52904 (-Wstrict-overflow false alarm with bounded loop)

gcc/testsuite
2014-08-18  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/52904
	* gcc.dg/pr52904.c: New test.

From-SVN: r214084

gcc/testsuite/ChangeLog

+2014-08-18  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	PR tree-optimization/52904
+	* gcc.dg/pr52904.c: New test.
+
 2014-08-17  Tobias Burnus  <burnus@net-b.de>
 
 	* gfortran.dg/finalize_27.f90: New.

gcc/testsuite/gcc.dg/pr52904.c

+/* { dg-do compile } */
+/* { dg-options "-Wstrict-overflow -O2" } */
+extern int foo (int);
+
+int
+wait_reading_process_output (void)
+{
+  int nfds = 0;
+  int channel;
+
+  for (channel = 0; channel < 1024; ++channel)
+    {
+      if (foo (channel))
+	nfds++;
+    }
+
+  if (nfds < 0) /* { dg-bogus "assuming signed overflow does not occur" } */
+    return 1;
+  return 0;
+}