* configure.in (mips*-*-irix6*o32): Enable stabs.

	gcc:
	* config.gcc (mips-sgi-irix6*o32): New configuration.

	* configure.in (libgcc_visibility): Disable for mips-sgi-irix6*o32
	configurations.
	* configure: Regenerate.

	* config/mips/iris6-o32-as.h: New file.
	* config/mips/iris6-o32.h: New file.

	* config/mips/iris5gas.h (TARGET_ASM_NAMED_SECTION): Define.
	(NM_FLAGS): Define.
	(HAVE_AS_SHF_MERGE): Undefine.

	* config/mips/t-iris5-as: New file.
	* config.gcc (mips-sgi-irix6*o32, mips-sgi-irix5*): Use it.

	* config/mips/t-iris6 (SHLIB_EXT, SHLIB_SOLINK, SHLIB_SONAME,
	SHLIB_NAME, SHLIB_MAP, SHLIB_OBJS, SHLIB_SLIBDIR_QUAL, SHLIB_LINK,
	SHLIB_INSTALL, SHLIB_MKMAP, SHLIB_MAPFILES, FPBIT, DPBIT,
	dp-bit.c, fp-bit.c): Move ...
	* config/mips/t-iris5-6: ... here.
	New file, shared by IRIX 5 and IRIX 6.
	* config.gcc (mips-sgi-irix6*o32, mips-sgi-irix6*,
	mips-sgi-irix5*): Use it.

	* config/mips/iris6.h: Remove duplicate comment.

	* config/mips/mips.c (TARGET_ASM_UNALIGNED_DI_OP) [TARGET_IRIX5 &&
	!TARGET_IRIX6]: Define.
	(mips_asm_file_start): Don't emit mdebug.<ABI> sections on IRIX 5/6.

	* config/mips/mips.h (ASM_DECLARE_FUNCTION_NAME): Fix comment.

	gcc/testsuite:
	* gcc.misc-tests/linkage.exp: Handle mips-sgi-irix6*o32
	configuration and IRIX 6 O32 ABI.

	libstdc++-v3:
	* configure.target (target_os switch): Allow for irix6*o32
	configurations.

From-SVN: r55401