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018a3d51a4
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
35 lines
1019 B
C++
35 lines
1019 B
C++
// -*- C++ -*-
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//===------------------------ __undef_macros ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifdef min
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#if !defined(_LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS)
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#if defined(_LIBCPP_WARNING)
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_LIBCPP_WARNING("macro min is incompatible with C++. Try #define NOMINMAX "
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"before any Windows header. #undefing min")
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#else
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#warning: macro min is incompatible with C++. #undefing min
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#endif
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#endif
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#undef min
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#endif
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#ifdef max
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#if !defined(_LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS)
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#if defined(_LIBCPP_WARNING)
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_LIBCPP_WARNING("macro max is incompatible with C++. Try #define NOMINMAX "
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"before any Windows header. #undefing max")
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#else
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#warning: macro max is incompatible with C++. #undefing max
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#endif
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#endif
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#undef max
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#endif
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