[cfe-dev] clang-tidy & SSE with GCC toolchain

[Craig Topper via cfe-dev]

The gcc version of xmmintrin.h is not compatible with clang. Clang has its
own version. Maybe you need to explicitly add the clang include directory
to your command line?

~Craig

On Thu, Jan 25, 2018 at 4:25 AM, Daniel Evers via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hey!
>
>
>
> I have a project which is compiled with GCC (7) and Clang (5.0). The
> clang built uses the GCC tool chain, like this (Red Hat 7 with
> devtoolset-7):
>
>      clang++ -gcc-toolchain /opt/rh/devtoolset-7/root/usr […]
>
>
>
> The code compiles and runs fine, but running clang-tidy (using the same
> compiler flags) chokes on the SSE built-ins in GCC’s headers:
>
> /opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/include/xmmintrin.h:54:3:
> error: argument to '__builtin_prefetch' must be a constant integer
> [clang-diagnostic-error]
>
>   __builtin_prefetch (__P, (__I & 0x4) >> 2, __I & 0x3);
>
>   ^
>
> /opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/include/xmmintrin.h:130:19:
> error: use of undeclared identifier '__builtin_ia32_addss'
> [clang-diagnostic-error]
>
>   return (__m128) __builtin_ia32_addss ((__v4sf)__A, (__v4sf)__B);
>
>                   ^
>
> /opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/include/xmmintrin.h:136:19:
> error: use of undeclared identifier '__builtin_ia32_subss'
> [clang-diagnostic-error]
>
>   return (__m128) __builtin_ia32_subss ((__v4sf)__A, (__v4sf)__B);
>
>
>
> [more errors following…]
>
>
>
> This happens as soon as I include <xmmintrin.h> (e.g. indirectly via
> Boost.UUID).
>
>
>
> I’m wondering that the clang compiler accepts the code, while clang-tidy
> doesn’t.
>
> Any ideas how to fix this? My current workaround is to disable SSE-support
> in Boost.UUID via macro for clang-tidy, but the problem will re-appear as
> soon as some other lib tries to use SSE instructions.
>
>
>
> Cheers,
>
> Daniel Evers
>
>
>
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