include/limits.h

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_LIMITS_H
#define _LIBCPP_LIMITS_H

/*
    limits.h synopsis

Macros:

    CHAR_BIT
    SCHAR_MIN
    SCHAR_MAX
    UCHAR_MAX
    CHAR_MIN
    CHAR_MAX
    MB_LEN_MAX
    SHRT_MIN
    SHRT_MAX
    USHRT_MAX
    INT_MIN
    INT_MAX
    UINT_MAX
    LONG_MIN
    LONG_MAX
    ULONG_MAX
    LLONG_MIN   // C99
    LLONG_MAX   // C99
    ULLONG_MAX  // C99

*/

#include <__config>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

#ifdef _LIBCPP_COMPILER_GCC

// GCC header limits.h recursively includes itself through another header called
// syslimits.h for some reason. This setup breaks down if we directly
// #include_next GCC's limits.h (reasons not entirely clear to me).
// See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107795 for more details.
// Therefore, we manually re-create the necessary include sequence below:

// Get the system limits.h defines (force recurse into the next level)
#define _GCC_LIMITS_H_
#define _GCC_NEXT_LIMITS_H
#include_next <limits.h>

// Get the ISO C defines
#undef _GCC_LIMITS_H_
#include_next <limits.h>

#else

#  if __has_include_next(<limits.h>)
#    include_next <limits.h>
#  endif

#endif // _LIBCPP_COMPILER_GCC

#endif // _LIBCPP_LIMITS_H