* config.gcc (mips-sgi-irix6*o32): Only enable use_collect2

	* config.gcc (mips-sgi-irix6*o32): Only enable use_collect2
	without gas.
	(mips-sgi-irix6*): Likewise.

	* config/mips/iris6gas.h: New file.
	* gcc/config.gcc (mips-sgi-irix6*): Use it.

	* config/mips/mips.h (TARGET_IRIX): Provide default.
	(TARGET_IRIX5): Likewise.
	(TARGET_SGI_O32_AS): Likewise.
	* config/mips/iris5.h (TARGET_IRIX): Redefine as 1.
	(TARGET_IRIX5): Likewise.
	* config/mips/iris6.h (TARGET_IRIX6): Remove.
	(TARGET_IRIX5): Redefine as 0.

	* config/mips/mips.c (mips_output_external): Test for IRIX 6 O32
	linker workaround with TARGET_IRIX and mips_abi instead of
	ASM_OUTPUT_UNDEF_FUNCTION.
	(mips_file_end): Inline old ASM_OUTPUT_UNDEF_FUNCTION definition,
	testing TARGET_IRIX and mips_abi explicitly.
	* config/mips/iris5.h (ASM_OUTPUT_UNDEF_FUNCTION): Remove.
	* config/mips/iris6.h (ASM_OUTPUT_UNDEF_FUNCTION): Remove undef.

	* config/mips/mips.c (irix_output_external_libcall): Renamed from
	mips_output_external_libcall.
	Use new TARGET_IRIX in guard.
	* config/mips/mips-protos.h (irix_output_external_libcall): Match
	this.
	* config/mips/iris5.h (TARGET_ASM_EXTERNAL_LIBCALL): Likewise.

	* config/mips/iris5gas.h (HAVE_GAS_SHF_MERGE): Update comment.
	Define as 0.

	* config/mips/iris6.h (FUNCTION_NAME_ALREADY_DECLARED): Define
	depending on mips_abi.
	* config/mips/linux.h (FUNCTION_NAME_ALREADY_DECLARED): Define as 1.
	* config/mips/mips.c (mips_output_function_prologue): Test
	FUNCTION_NAME_ALREADY_DECLARED at runtime.
	(mips_output_function_epilogue): Likewise.
	(build_mips16_function_stub): Likewise.
	(build_mips16_call_stub): Likewise.
	* config/mips/mips.h (FUNCTION_NAME_ALREADY_DECLARED): Provide
	default.

	* config/mips/iris6.h (DWARF2_UNWIND_INFO): Don't define for native
	IRIX 6 O32 assembler.
	(SUBTARGET_CC1_SPEC): Enforce mips2 ISA with O32 ABI.
	(TARGET_OS_CPP_BUILTINS): Define _ABIO32, use it to define
	_MIPS_SIM for O32 ABI.
	(DWARF2_FRAME_INFO): Don't define for native IRIX 6 O32 assembler.
	(ASM_DECLARE_FUNCTION_NAME): Integrate mips.h version.
	(ASM_DECLARE_FUNCTION_SIZE): Move undef before redefinition.
	Integrate O32 version.
	(SUBTARGET_ASM_SPEC): Handle -mabi=32.
	(SUBTARGET_ASM_DEBUGGING_SPEC): Add mdebug_asm_spec for gas with
	O32 ABI.
	(BSS_SECTION_ASM_OP_32): Define.
	(BSS_SECTION_ASM_OP_64): Likewise.
	(BSS_SECTION_ASM_OP): Define differently for O32 and N32/N64 ABIs
	using them.
	(TARGET_ASM_NAMED_SECTION): Reflect renaming.
	Move up to allow override for O32 ABI without GNU as.
	(EH_FRAME_SECTION_NAME): Define explicitly.
	(MUST_USE_SJLJ_EXCEPTIONS): Define.
	[_MIPS_SIM == _ABIO32 && !GAS] (CTORS_SECTION_ASM_OP,
	DTORS_SECTION_ASM_OP): Dummy definitions.
	(TARGET_ASM_NAMED_SECTION): Undef statically.
	(EH_FRAME_SECTION_NAME): Likewise.
	(ASM_OUTPUT_FILENAME): Integrate mips.h version.
	(LINK_SPEC): Only use default options -call_shared -no_unresolved
	without -r.
	Don't pass -init, -fini with -mabi=32.
	(COLLECT_PARSE_FLAG): Define.

	* config/mips/mips.c (iris6_asm_named_section_1): Changed guard to
	TARGET_IRIX.
	Renamed to use irix_ prefix.
	(iris6_asm_named_section): Likewise.
	(iris_section_align_entry_eq): Likewise.
	(iris_section_align_entry_hash): Likewise.
	(iris6_file_start): Likewise.
	(iris6_section_align_1): Likewise.
	(iris6_file_end): Likewise.
	(iris6_section_type_flags): Likewise.
	(iris_section_align_htab): Likewise.
	(iris_orig_asm_out_file): Likewise.
	[TARGET_IRIX] (TARGET_ASM_FILE_START): Reflect rename.
	(TARGET_ASM_FILE_END): Likewise.
	(TARGET_SECTION_TYPE_FLAGS): Likewise.

	* config/mips/mips.c [TARGET_IRIX5 && !TARGET_IRIX6]
	(TARGET_ASM_UNALIGNED_HI_OP): Use runtime initialization in
	override_options instead.
	(TARGET_ASM_UNALIGNED_SI_OP): Likewise.
	(TARGET_ASM_UNALIGNED_DI_OP): Likewise.
	* config/mips/mips.c (override_options) [USE_COLLECT2]: Restore
	flag_gnu_linker to defaults without USE_COLLECT2 for non-IRIX O32
	assemblers.
	Likewise for constructor/destructor handling.
	(override_options): Handle IRIX O32 assembler quirks.
	[TARGET_IRIX] (irix_asm_named_section): Handle O32 ABI with and
	without gas.
	(mips_file_start): Use new TARGET_IRIX.
	(mips_declare_object_name): No special processing for IRIX O32
	assembler.
	(mips_finish_declare_object): Likewise.
	(irix_asm_output_align): Renamed from iris6_asm_output_align.
	Don't record alignment for O32 ABI.
	(irix_file_start): Renamed from iris6_file_start.
	Return early for O32 ABI.
	(irix_file_end): Renamed from iris6_file_end.
	Don't emit .section directives for O32 ABI.
	* config/mips/iris6.h (ASM_OUTPUT_ALIGN): Reflect renaming.
	* config/mips/mips-protos.h (irix_asm_output_align): Likewise.

	* config/mips/t-iris6 (MULTILIB_OPTIONS): Add mabi=32.
	(MULTILIB_OSDIRNAMES): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@72600 138bc75d-0d04-0410-961f-82ee72b054a4