LoongArch: Add enum-style -mexplicit-relocs= option

To take a better balance between scheduling and relaxation when -flto is
enabled, add three-way -mexplicit-relocs={auto,none,always} options.
The old -mexplicit-relocs and -mno-explicit-relocs options are still
supported, they are mapped to -mexplicit-relocs=always and
-mexplicit-relocs=none.

The default choice is determined by probing assembler capabilities at
build time.  If the assembler does not supports explicit relocs at all,
the default will be none; if it supports explicit relocs but not
relaxation, the default will be always; if both explicit relocs and
relaxation are supported, the default will be auto.

Currently auto is same as none.  We will make auto more clever in
following changes.

gcc/ChangeLog:

	* config/loongarch/genopts/loongarch-strings: Add strings for
	-mexplicit-relocs={auto,none,always}.
	* config/loongarch/genopts/loongarch.opt.in: Add options for
	-mexplicit-relocs={auto,none,always}.
	* config/loongarch/loongarch-str.h: Regenerate.
	* config/loongarch/loongarch.opt: Regenerate.
	* config/loongarch/loongarch-def.h
	(EXPLICIT_RELOCS_AUTO): Define.
	(EXPLICIT_RELOCS_NONE): Define.
	(EXPLICIT_RELOCS_ALWAYS): Define.
	(N_EXPLICIT_RELOCS_TYPES): Define.
	* config/loongarch/loongarch.cc
	(loongarch_option_override_internal): Error out if the old-style
	-m[no-]explicit-relocs option is used with
	-mexplicit-relocs={auto,none,always} together.  Map
	-mno-explicit-relocs to -mexplicit-relocs=none and
	-mexplicit-relocs to -mexplicit-relocs=always for backward
	compatibility.  Set a proper default for -mexplicit-relocs=
	based on configure-time probed linker capability.  Update a
	diagnostic message to mention -mexplicit-relocs=always instead
	of the old-style -mexplicit-relocs.
	(loongarch_handle_model_attribute): Update a diagnostic message
	to mention -mexplicit-relocs=always instead of the old-style
	-mexplicit-relocs.
	* config/loongarch/loongarch.h (TARGET_EXPLICIT_RELOCS): Define.

0 files changed, 0 insertions, 0 deletions