1 dnl Check whether limits.h has needed features.
3 dnl Copyright 2016-2021 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
10 AC_DEFUN_ONCE([gl_LIMITS_H],
12 gl_CHECK_NEXT_HEADERS([limits.h])
14 AC_CACHE_CHECK([whether limits.h has WORD_BIT, BOOL_WIDTH etc.],
15 [gl_cv_header_limits_width],
18 [[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
19 #define __STDC_WANT_IEC_60559_BFP_EXT__ 1
22 long long llm = LLONG_MAX;
24 int ullw = ULLONG_WIDTH;
27 [gl_cv_header_limits_width=yes],
28 [gl_cv_header_limits_width=no])])
29 if test "$gl_cv_header_limits_width" = yes; then
35 AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"])
38 dnl Unconditionally enables the replacement of <limits.h>.
39 AC_DEFUN([gl_REPLACE_LIMITS_H],
41 AC_REQUIRE([gl_LIMITS_H])
43 AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"])