On 23 Dec 2017, at 10:56, Peter Jeremy <pe...@rulingia.com> wrote:
> Since r326496, buildworld on my 12-current/amd64 system has consistently
> died as follows.
> /usr/src/contrib/llvm/tools/clang/lib/Basic/SourceManager.cpp:1166:10: fatal 
> error: 'emmintrin.h' file not found
> #include <emmintrin.h>
>         ^~~~~~~~~~~~~
> 1 error generated.
> *** Error code 1
> Stop.
> make[4]: stopped in /usr/src/lib/clang/libclang
> I'm building on a 12.0-CURRENT VirtualBox guest at r326430.  I've checked
> that my /usr/src is clean and deleted /usr/obj to no effect.  I have dug
> into SourceManager.cpp and the #include is protected by a #if __SSE2__,
> which is relying on clang internal checks to define (and my CPU supports
> SSE2).  Does anyone have any ideas to explain what is going on?

First of all, does your host system have emmintrin.h?  E.g. what is the
output of "find /usr/lib/clang -name emmintrin.h" ?

Second, I think this scenario might be possible if you force -march or
other CPU type flags into CFLAGS, instead of using CPUTYPE.  What is the
contents of your make.conf, and other build environment variables?


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