re PR middle-end/17526 (libcpp is miscompiled with -fno-pcc-struct-return -O2)

2008-05-25  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/17526
	* gcc.dg/torture/pr17526.c: New testcase.

From-SVN: r135876

gcc/testsuite/ChangeLog

+2008-05-25  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/17526
+	* gcc.dg/torture/pr17526.c: New testcase.
+
 2008-05-24  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* gcc.dg/tg-tests.h: Fix spelling of FP_INFINITE.

gcc/testsuite/gcc.dg/torture/pr17526.c

+/* { dg-do run } */
+/* { dg-options "-fno-pcc-struct-return" { target i?86-*-* } } */
+
+void abort(void);
+
+typedef struct { int i; } A;
+
+A __attribute__((noinline))
+foo(void)
+{
+    A a = { -1 };
+    return a;
+}
+
+void __attribute__((noinline))
+bar(A *p)
+{
+    *p = foo();
+}
+
+int main(void)
+{
+    A a;
+    bar(&a);
+    if (a.i != -1) abort();
+    return 0;
+}