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, 2 insertions, 1 deletions

diff --git a/gcc/c-opts.c b/gcc/c-opts.c
index ba86e455729..d0e8b8e3c8e 100644
--- a/gcc/c-opts.c
+++ b/gcc/c-opts.c
@@ -702,7 +702,8 @@ c_common_decode_option (argc, argv)
       warn_sequence_point = on;	/* Was C only.  */
       warn_sign_compare = on;	/* Was C++ only.  */
       warn_switch = on;
-
+      warn_strict_aliasing = on;
+      
       /* Only warn about unknown pragmas that are not in system
 	 headers.  */                                        
       warn_unknown_pragmas = on;