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Subject: [Bug target/100067] Unexpected warning for -mcpu=neoverse-n1 when
 configured with --with-fpu
Date: Wed, 14 Apr 2021 10:00:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100067

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Earnshaw <rearnsha@gcc.gnu.or=
g>:

https://gcc.gnu.org/g:d1e4368ddb76a92c44f824c8e4ca1a3de8149342

commit r11-8168-gd1e4368ddb76a92c44f824c8e4ca1a3de8149342
Author: Richard Earnshaw <rearnsha@arm.com>
Date:   Wed Apr 14 10:56:36 2021 +0100

    arm: fix warning when -mcpu=3Dneoverse-n1 is used with -mfpu=3Dneon [PR=
100067]

    If the compiler is configured with --with-fpu=3D<!auto> (or invoked
    with, say, -mfpu=3Dneon), then specifying -mcpu=3Dneoverse-n1 can lead =
to
    an unexpected warning: cc1: warning: switch =C3=A2-mcpu=3Dneoverse-n1=
=C3=A2
    conflicts with =C3=A2-march=3Darmv8.2-a=C3=A2 switch

    The fix for this is to correctly remove all the feature bits relating
    to simd/fp units when -mfpu is used, not just those bits that form
    part of the -mfpu specification (which is a subset).

    gcc:
            PR target/100067
            * config/arm/arm.c (arm_configure_build_target): Strip
isa_all_fpbits
            from the isa_delta when -mfpu has been used.
            (arm_options_perform_arch_sanity_checks): It's the architecture
that
            lacks an FPU not the processor.=