gcc:

	* c-opts.c (c_common_decode_option): Add warn_strict_aliasing to
	-Wall.
	* c-typeck.c (build_c_cast): Use warn_strict_aliasing, tweak
	message.
	* flags.h (warn_strict_aliasing): Declare.
	* toplev.c (warn_strict_aliasing): Define.
	(lang_independent_options): Add it.
	* doc/invoke.texi (-Wstrict-aliasing): Document it.
testsuite:
	* gcc.dg/alias-1.c: Tweak expected warning.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@57938 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/flags.h b/gcc/flags.h
index e0e7b09a168..c5492759f07 100644
--- a/gcc/flags.h
+++ b/gcc/flags.h
@@ -184,6 +184,11 @@ extern int warn_disabled_optimization;
 
 extern int warn_deprecated_decl;
 
+/* Nonzero means warn about constructs which might not be strict
+   aliasing safe.  */
+
+extern int warn_strict_aliasing;
+
 /* Nonzero if generating code to do profiling.  */
 
 extern int profile_flag;