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b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CXX03___CONFIGURATION_COMPILER_H
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#define _LIBCPP___CXX03___CONFIGURATION_COMPILER_H
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#include <__cxx03/__configuration/config_site_shim.h>
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#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
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# pragma GCC system_header
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#endif
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#if defined(__apple_build_version__)
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// Given AppleClang XX.Y.Z, _LIBCPP_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403)
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# define _LIBCPP_COMPILER_CLANG_BASED
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# define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000)
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#elif defined(__clang__)
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# define _LIBCPP_COMPILER_CLANG_BASED
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# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__)
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#elif defined(__GNUC__)
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# define _LIBCPP_COMPILER_GCC
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# define _LIBCPP_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
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#endif
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#ifdef __cplusplus
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// Warn if a compiler version is used that is not supported anymore
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// LLVM RELEASE Update the minimum compiler versions
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# if defined(_LIBCPP_CLANG_VER)
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# if _LIBCPP_CLANG_VER < 1700
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# warning "Libc++ only supports Clang 17 and later"
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# endif
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# elif defined(_LIBCPP_APPLE_CLANG_VER)
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# if _LIBCPP_APPLE_CLANG_VER < 1500
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# warning "Libc++ only supports AppleClang 15 and later"
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# endif
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# elif defined(_LIBCPP_GCC_VER)
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# if _LIBCPP_GCC_VER < 1400
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# warning "Libc++ only supports GCC 14 and later"
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# endif
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# endif
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#endif
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#endif // _LIBCPP___CXX03___CONFIGURATION_COMPILER_H
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