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

    gcc/
    * config/arm/elf.h: Use __ARM_ARCH_ISA_THUMB and __ARM_ARCH_ISA_ARM to
    decide whether to prevent some libgcc routines being included for some
    multilibs rather than __ARM_ARCH_6M__ and add comment to indicate the
    link between this condition and the one in
    libgcc/config/arm/lib1func.S.

    gcc/testsuite/
    * lib/target-supports.exp (check_effective_target_arm_cortex_m): Use
    __ARM_ARCH_ISA_ARM to test for Cortex-M devices.

    libgcc/
    * config/arm/bpabi-v6m.S: Clarify what architectures is the
    implementation suitable for.
    * config/arm/lib1funcs.S (__prefer_thumb__): Define among other cases
    for all Thumb-1 only targets.
    (NOT_ISA_TARGET_32BIT): Define for Thumb-1 only targets.
    (THUMB_LDIV0): Test for NOT_ISA_TARGET_32BIT rather than
    __ARM_ARCH_6M__.
    (EQUIV): Likewise.
    (ARM_FUNC_ALIAS): Likewise.
    (umodsi3): Add check to __ARM_ARCH_ISA_THUMB != 1 to guard the idiv
    version.
    (modsi3): Likewise.
    (clzsi2): Test for NOT_ISA_TARGET_32BIT rather than __ARM_ARCH_6M__.
    (clzdi2): Likewise.
    (ctzsi2): Likewise.
    (L_interwork_call_via_rX): Test for __ARM_ARCH_ISA_ARM rather than
    __ARM_ARCH_6M__ in guard for checking whether it is defined.
    (final includes): Test for NOT_ISA_TARGET_32BIT rather than
    __ARM_ARCH_6M__ and add comment to indicate the connection between
    this condition and the one in gcc/config/arm/elf.h.
    * config/arm/libunwind.S: Test for __ARM_ARCH_ISA_THUMB and
    __ARM_ARCH_ISA_ARM rather than __ARM_ARCH_6M__.
    * config/arm/t-softfp: Likewise.

From-SVN: r238079