[Bug 237461] Serveral references to emmintrin.h fails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237461

dewayne at heuristicsystems.com.au changed:

           What    |Removed                     |Added
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                 CC|                            |dewayne at heuristicsystems.co
                   |                            |m.au

--- Comment #10 from dewayne at heuristicsystems.com.au ---
(In reply to Ed Maste from comment #3)
To your question, I suspect that while folks perform a tidy-up of their
environment, you know like "cd /usr/src && make delete-old" they proceed with
something like "find -anewer /usr/lib/ -delete;" which inadvertently blows away
the /usr/lib/clang/$VER/include - ta dah, kaput!

I know, because its a curse being tidy!  ;)

If this happens to you, here's a hint do NOT copy 
/usr/src/contrib/llvm/tools/clang/lib/Headers/
into /usr/lib/clang/$VER/include 
because you'll duplicate things like stddef.h and the compile will fail.  You
might be able to get by with just copying *intrin.h, but I was impatient.

I know this is tedious but much better to either:
- read the Makefile to identify only what you need; or 
- /usr/obj/usr/src/i386.i386/tmp/usr/lib/clang/8.0.1/include/*

It really threw me to find that the build required something outside either
/usr/obj or /usr/src.  Learning something new everyday...  Hmm I wonder why 
pkg-static isn't part of a buildworld, I do after all build from source;
perhaps, for tomorrow ;)

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