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[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

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Summary:
This patch improves how libc++ handles min/max macros within the headers. Previously libc++ would undef them and emit a warning.
This patch changes libc++ to use `#pragma push_macro`  to save the macro before undefining it, and `#pragma pop_macro` to restore the macros and the end of the header.

Reviewers: mclow.lists, bcraig, compnerd, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits, krytarowski

Differential Revision: https://reviews.llvm.org/D33080

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@304357 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-05-31 22:07:49 +00:00
parent 256425754d
commit 018a3d51a4
50 changed files with 601 additions and 95 deletions
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2
include/module.modulemap
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@@ -484,7 +484,7 @@ module std [system] {
module __string { header "__string" export * }
module __tree { header "__tree" export * }
module __tuple { header "__tuple" export * }
module __undef_min_max { header "__undef_min_max" export * }
module __undef_macros { header "__undef_macros" export * }
module experimental {
requires cplusplus11