PR target/6429
	* Makefile.in (libgcc.mk): Pass SHLIB_SLIBDIR_SUFFIXES to mklibgcc.
	* mklibgcc.in: If SHLIB_SLIBDIR_SUFFIXES is defined, put libgcc_s
	shared libraries into multilib dirs, with SONAME libgcc_s.so.1 for
	base multilibs.
	* config/t-slibgcc-elf-ver (SHLIB_LINK): Adjust for the above.
	* config/t-slibgcc-sld (SHLIB_LINK): Likewise.
	* config/i386/t-linux64 (SHLIB_SLIBDIR_SUFFIXES): Define.
	* config/sparc/t-linux64 (SHLIB_SLIBDIR_SUFFIXES): Define.
	* config/sparc/t-sol2-64 (SHLIB_SLIBDIR_SUFFIXES): Define.

	* lib/g77.exp (g77_link_flags): Append all multilib dirs containing
	libgcc_s*.so.1 below gcc object dir to LD_LIBRARY_PATH.
	* lib/g++.exp (g++_link_flags): Likewise.
	* lib/objc.exp (objc_target_compile): Likewise.

	* testsuite/lib/libstdc++-v3-dg.exp (libstdc++-v3-init): Append all
	multilib dirs containing libgcc_s*.so.1 below gcc object dir to
	LD_LIBRARY_PATH.

	* testsuite/lib/libjava.exp (libjava_arguments): Append all
	multilib dirs containing libgcc_s*.so.1 below gcc object dir to
	LD_LIBRARY_PATH.

From-SVN: r53345