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Re: [patch i386]:Ensure intrinsic functions are declared "C"

On 05/12/2010 10:02 AM, Richard Guenther wrote: 
The issue, which occures here is, that a user wants - for example - to
include <xmmintrin.h>  header in C++. Now he includes afterwards for
windows the math.h/intrin.h (which both have explicit C language
scope). What happens here? A bunch of warnings/failures caused by C++
vs. C language scope.
So why we shouldn't care?

You'll get ODR violation errors anyway in that case.

I don't think so. If the Windows header just has declarations, they can merge just fine with the xmmintrin.h definitions -- if they have the right language linkage.

You'd only get an ODR violation if you have a class/enum/inline/template defined in multiple translation units that uses the intrinsics but sometimes sees the definitions in xmmintrin and sometimes not.

Jason

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