[patch, testsuite] Fix PR 49191 with test for STRICT_ALIGNMENT

Steve Ellcey sje@cup.hp.com
Wed Jun 8 20:16:00 GMT 2011

Here is a patch to skip gcc.dg/memcpy-3.c on platforms that define
STRICT_ALIGNMENT.  It adds a new check_effective routine,
check_effective_target_strict_align that looks for a warning that will
only be produced on platforms that define STRICT_ALIGNMENT.

Technically, the test may not work if the default alignment for char
variables is the same as __BIGGEST_ALIGNMENT__ but hopefully that is a
rare or non-existent case.  If it does happen we can modify
check_effective_target_strict_align to explicitly check for that

This new check should be useful for other tests as well but for now
I have just modified gcc.dg/memcpy-3.c to use it.  I verified that
this patch makes gcc.dg/memcpy-3.c UNSUPPORTED on IA64 HP-UX and I will
verify other platforms tonight including X86 Linux where STRICT_ALIGNMENT
is not defined before checking it in.

OK for checkin once my testing is done?

Steve Ellcey

2011-06-08  Steve Ellcey  <sje@cup.hp.com>

	PR middle-end/49191
	* lib/target-supports.exp (check_effective_target_strict_align): New.
	* gcc.dg/memcpy-3.c: Add dg-require-effective-target strict_align.

Index: lib/target-supports.exp
--- lib/target-supports.exp	(revision 174336)
+++ lib/target-supports.exp	(working copy)
@@ -3901,3 +3901,11 @@
     return 1
+proc check_effective_target_strict_align {} {
+    return [check_no_compiler_messages strict_align assembly {
+	char *y;
+	typedef char __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__))) c;
+	c *z;
+	void foo(void) { z = (c *) y; }
+    } "-Wcast-align"]
Index: gcc.dg/memcpy-3.c
--- gcc.dg/memcpy-3.c	(revision 174336)
+++ gcc.dg/memcpy-3.c	(working copy)
@@ -1,5 +1,6 @@
 /* { dg-do compile } */
 /* { dg-options "-O -fdump-tree-optimized" } */
+/* { dg-require-effective-target strict_align } */
 int get_int(const void *p)

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