5d87f60f89
Some platforms don't provide all C library headers. In practice, libc++
only requires a few C library headers to exist, and only a few functions
on those headers. Missing functions that libc++ doesn't need for its own
implementation are handled properly by the using_if_exists attribute,
however a missing header is currently a hard error when we try to
do #include_next.
This patch should make libc++ more flexible on platforms that do not
provide C headers that libc++ doesn't actually require for its own
implementation. The only downside is that it may move some errors from
the #include_next point to later in the compilation if we actually try
to use something that isn't provided, which could be somewhat confusing.
However, these errors should be caught by folks trying to port libc++
over to a new platform (when running the libc++ test suite), not by end
users.
NOTE: This is a reapplicaton of 226409, which was reverted in 674729813
because it broke the build. The issue has now been fixed with
https://reviews.llvm.org/D138062.
Differential Revision: https://reviews.llvm.org/D136683
164 lines
5.0 KiB
C++
164 lines
5.0 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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#if defined(__need_malloc_and_calloc)
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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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#include_next <stdlib.h>
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#elif !defined(_LIBCPP_STDLIB_H)
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#define _LIBCPP_STDLIB_H
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/*
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stdlib.h synopsis
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Macros:
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EXIT_FAILURE
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EXIT_SUCCESS
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MB_CUR_MAX
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NULL
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RAND_MAX
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Types:
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size_t
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div_t
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ldiv_t
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lldiv_t // C99
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double atof (const char* nptr);
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int atoi (const char* nptr);
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long atol (const char* nptr);
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long long atoll(const char* nptr); // C99
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double strtod (const char* restrict nptr, char** restrict endptr);
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float strtof (const char* restrict nptr, char** restrict endptr); // C99
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long double strtold (const char* restrict nptr, char** restrict endptr); // C99
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long strtol (const char* restrict nptr, char** restrict endptr, int base);
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long long strtoll (const char* restrict nptr, char** restrict endptr, int base); // C99
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unsigned long strtoul (const char* restrict nptr, char** restrict endptr, int base);
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unsigned long long strtoull(const char* restrict nptr, char** restrict endptr, int base); // C99
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int rand(void);
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void srand(unsigned int seed);
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void* calloc(size_t nmemb, size_t size);
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void free(void* ptr);
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void* malloc(size_t size);
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void* realloc(void* ptr, size_t size);
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void abort(void);
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int atexit(void (*func)(void));
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void exit(int status);
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void _Exit(int status);
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char* getenv(const char* name);
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int system(const char* string);
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void* bsearch(const void* key, const void* base, size_t nmemb, size_t size,
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int (*compar)(const void *, const void *));
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void qsort(void* base, size_t nmemb, size_t size,
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int (*compar)(const void *, const void *));
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int abs( int j);
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long abs( long j);
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long long abs(long long j); // C++0X
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long labs( long j);
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long long llabs(long long j); // C99
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div_t div( int numer, int denom);
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ldiv_t div( long numer, long denom);
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lldiv_t div(long long numer, long long denom); // C++0X
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ldiv_t ldiv( long numer, long denom);
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lldiv_t lldiv(long long numer, long long denom); // C99
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int mblen(const char* s, size_t n);
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int mbtowc(wchar_t* restrict pwc, const char* restrict s, size_t n);
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int wctomb(char* s, wchar_t wchar);
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size_t mbstowcs(wchar_t* restrict pwcs, const char* restrict s, size_t n);
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size_t wcstombs(char* restrict s, const wchar_t* restrict pwcs, size_t n);
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int at_quick_exit(void (*func)(void)) // C++11
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void quick_exit(int status); // C++11
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void *aligned_alloc(size_t alignment, size_t size); // C11
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*/
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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(<stdlib.h>)
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# include_next <stdlib.h>
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# endif
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#ifdef __cplusplus
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extern "C++" {
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// abs
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#ifdef abs
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# undef abs
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#endif
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#ifdef labs
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# undef labs
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#endif
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#ifdef llabs
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# undef llabs
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#endif
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// MSVCRT already has the correct prototype in <stdlib.h> if __cplusplus is defined
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#if !defined(_LIBCPP_MSVCRT) && !defined(__sun__)
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inline _LIBCPP_INLINE_VISIBILITY long abs(long __x) _NOEXCEPT {
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return __builtin_labs(__x);
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}
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inline _LIBCPP_INLINE_VISIBILITY long long abs(long long __x) _NOEXCEPT {
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return __builtin_llabs(__x);
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}
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#endif // !defined(_LIBCPP_MSVCRT) && !defined(__sun__)
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#if !defined(__sun__)
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inline _LIBCPP_INLINE_VISIBILITY float abs(float __lcpp_x) _NOEXCEPT {
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return __builtin_fabsf(__lcpp_x); // Use builtins to prevent needing math.h
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}
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inline _LIBCPP_INLINE_VISIBILITY double abs(double __lcpp_x) _NOEXCEPT {
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return __builtin_fabs(__lcpp_x);
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}
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inline _LIBCPP_INLINE_VISIBILITY long double
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abs(long double __lcpp_x) _NOEXCEPT {
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return __builtin_fabsl(__lcpp_x);
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}
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#endif // !defined(__sun__)
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// div
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#ifdef div
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# undef div
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#endif
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#ifdef ldiv
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# undef ldiv
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#endif
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#ifdef lldiv
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# undef lldiv
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#endif
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// MSVCRT already has the correct prototype in <stdlib.h> if __cplusplus is defined
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#if !defined(_LIBCPP_MSVCRT) && !defined(__sun__)
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inline _LIBCPP_INLINE_VISIBILITY ldiv_t div(long __x, long __y) _NOEXCEPT {
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return ::ldiv(__x, __y);
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}
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#if !(defined(__FreeBSD__) && !defined(__LONG_LONG_SUPPORTED))
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inline _LIBCPP_INLINE_VISIBILITY lldiv_t div(long long __x,
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long long __y) _NOEXCEPT {
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return ::lldiv(__x, __y);
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}
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#endif
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#endif // _LIBCPP_MSVCRT / __sun__
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} // extern "C++"
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#endif // __cplusplus
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#endif // _LIBCPP_STDLIB_H
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