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    Subject[PATCH v6 2/4] Compiler Attributes: Add __overloadable for Clang
    Date
    In order for FORTIFY_SOURCE to use __pass_object_size on an "inline
    extern" function, as all the fortified string functions are, the functions
    must be marked as being overloadable (i.e. different prototypes).
    This allows the __pass_object_size versions to take precedence.

    Cc: Miguel Ojeda <ojeda@kernel.org>
    Cc: Nick Desaulniers <ndesaulniers@google.com>
    Cc: Nathan Chancellor <nathan@kernel.org>
    Cc: llvm@lists.linux.dev
    Signed-off-by: Kees Cook <keescook@chromium.org>
    ---
    include/linux/compiler_attributes.h | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
    index 4ce370094e3a..dc3bf2a6e1c9 100644
    --- a/include/linux/compiler_attributes.h
    +++ b/include/linux/compiler_attributes.h
    @@ -257,6 +257,18 @@
    */
    #define __noreturn __attribute__((__noreturn__))

    +/*
    + * Optional: not supported by gcc.
    + * Optional: not supported by icc.
    + *
    + * clang: https://clang.llvm.org/docs/AttributeReference.html#overloadable
    + */
    +#if __has_attribute(__overloadable__)
    +# define __overloadable __attribute__((__overloadable__))
    +#else
    +# define __overloadable
    +#endif
    +
    /*
    * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-packed-type-attribute
    * clang: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-packed-variable-attribute
    --
    2.30.2
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