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    SubjectRe: [PATCH 05/29] x86: Base IBT bits
    > +config CC_HAS_IBT
    > + # GCC >= 9 and binutils >= 2.29
    > + # Retpoline check to work around
    > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93654
    > + def_bool $(cc-option, -fcf-protection=branch
    > -mindirect-branch-register) && $(as-instr,endbr64)
    > +
    Is -mindirect-branch-register breaks compiling with clang. Maybe we
    should we do instead?

    + def_bool ($(cc-option, -fcf-protection=branch
    -mindirect-branch-register) || $(cc-option, -mretpoline-external-thunk))
    && $(as-instr,endbr64)

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