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<p class="MsoNormal">Hey!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have a project which is compiled with GCC (7) and Clang (5.0)</span><span lang="EN-US" style="color:black;mso-fareast-language:DE">. The clang built uses the GCC tool chain, like this (Red Hat 7 with devtoolset-7):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:black;mso-fareast-language:DE"> clang++ -gcc-toolchain /opt/rh/devtoolset-7/root/usr […]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black;mso-fareast-language:DE">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:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New"">/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]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New""> __builtin_prefetch (__P, (__I & 0x4) >> 2, __I & 0x3);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New""> ^<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New"">/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]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New""> return (__m128) __builtin_ia32_addss ((__v4sf)__A, (__v4sf)__B);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New""> ^<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New"">/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]<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="font-family:"Courier New""> return (__m128) __builtin_ia32_subss ((__v4sf)__A, (__v4sf)__B);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[more errors following…]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This happens as soon as I include </span>
<span lang="EN-US" style="font-family:"Courier New""><xmmintrin.h></span><span lang="EN-US"> (e.g. indirectly via Boost.UUID).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m wondering that the clang compiler accepts the code, while clang-tidy doesn’t.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Daniel Evers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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