501645cbeb
The existence of <float.h> in libc++ leads to difficulties with modules, especially when it comes to supporting the various __need macros supported by the Clang builtin headers. Fortunately, libc++'s <float.h> only defines FLT_EVAL_METHOD and DECIMAL_DIG, which are already defined by the Clang builtin headers in C++11 mode. Hence, removing the header entirely should have no impact, apart from not defining FLT_EVAL_METHOD and DECIMAL_DIG in C++03 mode. However, that is arguably something that libc++ shouldn't be doing: if the underlying C library doesn't want to provide these definitions, then libc++ shouldn't force it to.
91 lines
1.8 KiB
C++
91 lines
1.8 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_CFLOAT
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#define _LIBCPP_CFLOAT
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/*
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cfloat 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_HAS_SUBNORM // C11
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DBL_HAS_SUBNORM // C11
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LDBL_HAS_SUBNORM // C11
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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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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 __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/cfloat>
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#else
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# include <__config>
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// <float.h> is not provided by libc++
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# if __has_include(<float.h>)
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# include <float.h>
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# ifdef _LIBCPP_FLOAT_H
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# error "If libc++ starts defining <float.h>, the __has_include check should move to libc++'s <float.h>"
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# endif
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# endif
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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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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_CFLOAT
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