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