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dnl Check whether limits.h has needed features.
dnl Copyright 2016-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Paul Eggert.
AC_DEFUN_ONCE([gl_LIMITS_H],
[
gl_CHECK_NEXT_HEADERS([limits.h])
AC_CACHE_CHECK([whether limits.h has WORD_BIT, BOOL_WIDTH etc.],
[gl_cv_header_limits_width],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
#define __STDC_WANT_IEC_60559_BFP_EXT__ 1
#endif
#include <limits.h>
long long llm = LLONG_MAX;
int wb = WORD_BIT;
int ullw = ULLONG_WIDTH;
int bw = BOOL_WIDTH;
int bm = BOOL_MAX;
int mblm = MB_LEN_MAX;
]])],
[gl_cv_header_limits_width=yes],
[gl_cv_header_limits_width=no])])
GL_GENERATE_LIMITS_H=true
AS_IF([test "$gl_cv_header_limits_width" = yes],
[AC_CACHE_CHECK([whether limits.h has SSIZE_MAX],
[gl_cv_header_limits_ssize_max],
[AC_COMPILE_IFELSE(
[AC_LANG_SOURCE(
[[#include <limits.h>
#ifndef SSIZE_MAX
#error "SSIZE_MAX is not defined"
#endif
]])],
[gl_cv_header_limits_ssize_max=yes],
[gl_cv_header_limits_ssize_max=no])])
if test "$gl_cv_header_limits_ssize_max" = yes; then
GL_GENERATE_LIMITS_H=false
fi])
])
dnl Unconditionally enables the replacement of <limits.h>.
AC_DEFUN([gl_REPLACE_LIMITS_H],
[
AC_REQUIRE([gl_LIMITS_H])
GL_GENERATE_LIMITS_H=true
])
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