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2015-12-04 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/68680
* calls.c (special_function_p): Return ECF_MAY_BE_ALLOCA for
BUILT_IN_ALLOCA{,_WITH_ALIGN}.
* gcc.target/i386/pr68680.c: New test.
--- gcc/calls.c (revision 231278)
+++ gcc/calls.c (revision 231279)
@@ -564,6 +564,17 @@ special_function_p (const_tree fndecl, i
flags |= ECF_NORETURN;
}
+ if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL)
+ switch (DECL_FUNCTION_CODE (fndecl))
+ {
+ case BUILT_IN_ALLOCA:
+ case BUILT_IN_ALLOCA_WITH_ALIGN:
+ flags |= ECF_MAY_BE_ALLOCA;
+ break;
+ default:
+ break;
+ }
+
return flags;
}
--- gcc/testsuite/gcc.target/i386/pr68680.c (revision 0)
+++ gcc/testsuite/gcc.target/i386/pr68680.c (revision 231279)
@@ -0,0 +1,15 @@
+/* PR tree-optimization/68680 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fstack-protector-strong" } */
+
+int foo (char *);
+
+int
+bar (unsigned long x)
+{
+ char a[x];
+ return foo (a);
+}
+
+/* Verify that this function is stack protected. */
+/* { dg-final { scan-assembler "stack_chk_fail" } } */
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