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2007-10-02 Jakub Jelinek <jakub@redhat.com>
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* decl.c (duplicate_decls): When redeclaring a builtin function,
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keep the merged decl builtin whenever types match, even if new
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decl defines a function.
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* gcc.dg/builtins-65.c: New test.
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* g++.dg/ext/builtin10.C: New test.
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--- gcc/cp/decl.c.jj 2007-10-01 22:11:09.000000000 +0200
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+++ gcc/cp/decl.c 2007-10-02 11:39:46.000000000 +0200
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@@ -2001,23 +2001,21 @@ duplicate_decls (tree newdecl, tree oldd
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DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
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DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
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}
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+ /* If redeclaring a builtin function, it stays built in. */
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+ if (types_match && DECL_BUILT_IN (olddecl))
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+ {
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+ DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
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+ DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
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+ /* If we're keeping the built-in definition, keep the rtl,
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+ regardless of declaration matches. */
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+ COPY_DECL_RTL (olddecl, newdecl);
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+ }
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if (new_defines_function)
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/* If defining a function declared with other language
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linkage, use the previously declared language linkage. */
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SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
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else if (types_match)
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{
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- /* If redeclaring a builtin function, and not a definition,
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- it stays built in. */
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- if (DECL_BUILT_IN (olddecl))
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- {
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- DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
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- DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
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- /* If we're keeping the built-in definition, keep the rtl,
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- regardless of declaration matches. */
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- COPY_DECL_RTL (olddecl, newdecl);
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- }
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-
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DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
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/* Don't clear out the arguments if we're just redeclaring a
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function. */
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--- gcc/testsuite/gcc.dg/builtins-65.c.jj 2007-10-02 11:23:51.000000000 +0200
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+++ gcc/testsuite/gcc.dg/builtins-65.c 2007-10-02 11:24:12.000000000 +0200
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@@ -0,0 +1,25 @@
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+/* { dg-do compile } */
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+/* { dg-options "-O2" } */
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+
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+typedef __SIZE_TYPE__ size_t;
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+extern void __chk_fail (void);
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+extern int snprintf (char *, size_t, const char *, ...);
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+extern inline __attribute__((gnu_inline, always_inline)) int snprintf (char *a, size_t b, const char *fmt, ...)
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+{
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+ if (__builtin_object_size (a, 0) != -1UL && __builtin_object_size (a, 0) < b)
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+ __chk_fail ();
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+ return __builtin_snprintf (a, b, fmt, __builtin_va_arg_pack ());
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+}
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+extern int snprintf (char *, size_t, const char *, ...) __asm ("mysnprintf");
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+
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+char buf[10];
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+
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+int
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+main (void)
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+{
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+ snprintf (buf, 10, "%d%d\n", 10, 10);
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+ return 0;
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+}
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+
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+/* { dg-final { scan-assembler "mysnprintf" } } */
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+/* { dg-final { scan-assembler-not "__chk_fail" } } */
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--- gcc/testsuite/g++.dg/ext/builtin10.C.jj 2007-10-02 11:19:45.000000000 +0200
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+++ gcc/testsuite/g++.dg/ext/builtin10.C 2007-10-02 11:23:26.000000000 +0200
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@@ -0,0 +1,27 @@
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+// { dg-do compile }
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+// { dg-options "-O2" }
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+
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+typedef __SIZE_TYPE__ size_t;
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+extern "C" {
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+extern void __chk_fail (void);
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+extern int snprintf (char *, size_t, const char *, ...);
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+extern inline __attribute__((gnu_inline, always_inline)) int snprintf (char *a, size_t b, const char *fmt, ...)
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+{
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+ if (__builtin_object_size (a, 0) != -1UL && __builtin_object_size (a, 0) < b)
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+ __chk_fail ();
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+ return __builtin_snprintf (a, b, fmt, __builtin_va_arg_pack ());
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+}
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+extern int snprintf (char *, size_t, const char *, ...) __asm ("mysnprintf");
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+}
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+
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+char buf[10];
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+
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+int
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+main (void)
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+{
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+ snprintf (buf, 10, "%d%d\n", 10, 10);
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+ return 0;
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+}
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+
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+// { dg-final { scan-assembler "mysnprintf" } }
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+// { dg-final { scan-assembler-not "__chk_fail" } }
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