tree 1291cf5aad5bd3d1d7d92f82e4db9f151676d45c
parent e686a8dec02d46cf48ae4f830008d7f50e626723
author Peter Collingbourne <peter@pcc.me.uk> 1516929563 +0000
committer Peter Collingbourne <peter@pcc.me.uk> 1516929563 +0000

libcxx: Move #include_next <math.h> out of header guard in wrapper header.

Code on Windows expects to be able to do:

 #define _USE_MATH_DEFINES
 #include <math.h>

and receive the definitions of mathematical constants, even if <math.h>
has previously been included. To support this scenario, re-include
<math.h> every time the wrapper header is included.

Differential Revision: https://reviews.llvm.org/D42403

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@323490 91177308-0d34-0410-b5e6-96231b3b80d8