c-opts.c (c_common_decode_option): Add warn_strict_aliasing to -Wall.

c-opts.c (c_common_decode_option): Add warn_strict_aliasing to -Wall.

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.

From-SVN: r57938