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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.
100 lines
1.9 KiB
C++
100 lines
1.9 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_FLOAT_H
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#define _LIBCPP_FLOAT_H
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/*
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float.h synopsis
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Macros:
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FLT_ROUNDS
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FLT_EVAL_METHOD // C99
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FLT_RADIX
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FLT_MANT_DIG
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DBL_MANT_DIG
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LDBL_MANT_DIG
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FLT_HAS_SUBNORM // C11
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DBL_HAS_SUBNORM // C11
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LDBL_HAS_SUBNORM // C11
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DECIMAL_DIG // C99
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FLT_DECIMAL_DIG // C11
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DBL_DECIMAL_DIG // C11
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LDBL_DECIMAL_DIG // C11
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FLT_DIG
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DBL_DIG
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LDBL_DIG
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FLT_MIN_EXP
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DBL_MIN_EXP
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LDBL_MIN_EXP
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FLT_MIN_10_EXP
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DBL_MIN_10_EXP
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LDBL_MIN_10_EXP
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FLT_MAX_EXP
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DBL_MAX_EXP
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LDBL_MAX_EXP
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FLT_MAX_10_EXP
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DBL_MAX_10_EXP
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LDBL_MAX_10_EXP
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FLT_MAX
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DBL_MAX
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LDBL_MAX
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FLT_EPSILON
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DBL_EPSILON
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LDBL_EPSILON
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FLT_MIN
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DBL_MIN
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LDBL_MIN
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FLT_TRUE_MIN // C11
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DBL_TRUE_MIN // C11
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LDBL_TRUE_MIN // C11
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*/
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#if defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/float.h>
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#else
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# include <__config>
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# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# endif
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# if __has_include_next(<float.h>)
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# include_next <float.h>
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# endif
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# ifdef __cplusplus
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# ifndef FLT_EVAL_METHOD
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# define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
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# endif
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# ifndef DECIMAL_DIG
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# define DECIMAL_DIG __DECIMAL_DIG__
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# endif
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# endif // __cplusplus
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#endif // defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_FLOAT_H
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