2008-10-21  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/

	* config.gcc (powerpc-*): Make t-ppcgas imply usegas.h.
	* config/svr4.h (SVR4_ASM_SPEC): New.
	(ASM_SPEC): Inherit from SVR4_ASM_SPEC.
	* config/rs6000/sysv4.h (ASM_SPEC): Inherit from SVR4_ASM_SPEC.

	* doc/invoke.texi (Option Summary): Add -T to linker options.
	(Link Options): Document -T.

From-SVN: r141267