arm-arches.def (armv8-m.base): Define new architecture.

arm-arches.def (armv8-m.base): Define new architecture.

2016-07-07  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    gcc/
    * config/arm/arm-arches.def (armv8-m.base): Define new architecture.
    (armv8-m.main): Likewise.
    (armv8-m.main+dsp): Likewise.
    * config/arm/arm-protos.h (FL_FOR_ARCH8M_BASE): Define.
    (FL_FOR_ARCH8M_MAIN): Likewise.
    * config/arm/arm-tables.opt: Regenerate.
    * config/arm/bpabi.h: Add armv8-m.base, armv8-m.main and
    armv8-m.main+dsp to BE8_LINK_SPEC.
    * config/arm/arm.h (TARGET_HAVE_LDACQ): Exclude ARMv8-M.
    (enum base_architecture): Add BASE_ARCH_8M_BASE and BASE_ARCH_8M_MAIN.
    * config/arm/arm.c (arm_arch_name): Increase size to work with ARMv8-M
    Baseline and Mainline.
    (arm_option_override_internal): Also disable arm_restrict_it when
    !arm_arch_notm.  Update comment for -munaligned-access to also cover
    ARMv8-M Baseline.
    (arm_file_start): Increase buffer size for printing architecture name.
    * doc/invoke.texi: Document architectures armv8-m.base, armv8-m.main
    and armv8-m.main+dsp.
    (mno-unaligned-access): Clarify that this is disabled by default for
    ARMv8-M Baseline architectures as well.

    gcc/testsuite/
    * lib/target-supports.exp: Generate add_options_for_arm_arch_FUNC and
    check_effective_target_arm_arch_FUNC_multilib for ARMv8-M Baseline and
    ARMv8-M Mainline architectures.

    libgcc/
    * config/arm/lib1funcs.S (__ARM_ARCH__): Define to 8 for ARMv8-M.

From-SVN: r238081