PR testsuite/83131 - c-c++/common/attr-nonstring-3 failure for strcmp tests on PowerPC

gcc/ChangeLog:

	PR testsuite/83131
	* builtins.c (expand_builtin_strlen): Use get_callee_fndecl.
	(expand_builtin_strcmp): Call maybe_warn_nonstring_arg.	
	(expand_builtin_strncmp): Same.

gcc/testsuite/ChangeLog:

	PR testsuite/83131
	* c-c++-common/attr-nonstring-4.c: New test.

From-SVN: r255898

gcc/ChangeLog

+2017-12-20  Martin Sebor  <msebor@redhat.com>
+
+	PR testsuite/83131
+	* builtins.c (expand_builtin_strlen): Use get_callee_fndecl.
+	(expand_builtin_strcmp): Call maybe_warn_nonstring_arg.	
+	(expand_builtin_strncmp): Same.
+
 2017-12-20  Alexandre Oliva <aoliva@redhat.com>
 
 	PR bootstrap/83396

gcc/testsuite/ChangeLog

+2017-12-20  Martin Sebor  <msebor@redhat.com>
+
+	PR testsuite/83131
+	* c-c++-common/attr-nonstring-4.c: New test.
+
 2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	* gcc.dg/plugin/poly-int-tests.h (test_nonpoly_multiple_p): New

gcc/testsuite/c-c++-common/attr-nonstring-4.c

+/* PR middle-end/83131 - c-c++/common/attr-nonstring-3 failure for strcmp
+   tests on PowerPC
+   { dg-do compile }
+   { dg-options "-O2 -Wstringop-overflow -ftrack-macro-expansion=0" }  */
+
+#if __cplusplus
+extern "C" {
+#endif
+
+typedef __SIZE_TYPE__ size_t;
+
+extern int strcmp (const char*, const char*);
+extern int strncmp (const char*, const char*, size_t);
+
+#if __cplusplus
+}   /* extern "C" */
+#endif
+
+extern char arx[] __attribute__ ((nonstring));
+extern char ar5[5] __attribute__ ((nonstring));
+extern char str[];
+
+enum { N = sizeof ar5 };
+enum { X = sizeof ar5 + 1 };
+
+
+int warn_strcmp_cst_1 (void)
+{
+  return strcmp ("bar", arx);       /* { dg-warning "argument 2 declared attribute .nonstring." } */
+}
+
+int warn_strcmp_cst_2 (void)
+{
+  return strcmp (arx, "foo");       /* { dg-warning "argument 1 declared attribute .nonstring." } */
+}
+
+
+int warn_strncmp_cst_1 (void)
+{
+  return strncmp ("bar", ar5, X);   /* { dg-warning "argument 2 declared attribute .nonstring." } */
+}
+
+int warn_strncmp_cst_2 (void)
+{
+  return strncmp (ar5, "foo", X);   /* { dg-warning "argument 1 declared attribute .nonstring." } */
+}
+
+
+int nowarn_strncmp_cst_1 (void)
+{
+  return strncmp ("bar", ar5, N);
+}
+
+int nowarn_strncmp_cst_2 (void)
+{
+  return strncmp (ar5, "foo", N);
+}
+
+
+int warn_strncmp_var_1 (void)
+{
+  return strncmp (str, ar5, X);     /* { dg-warning "argument 2 declared attribute .nonstring." } */
+}
+
+int warn_strncmp_var_2 (void)
+{
+  return strncmp (ar5, str, X);     /* { dg-warning "argument 1 declared attribute .nonstring." } */
+}
+
+
+int nowarn_strncmp_var_1 (void)
+{
+  return strncmp (str, ar5, N);
+}
+
+int nowarn_strncmp_var_2 (void)
+{
+  return strncmp (ar5, str, N);
+}