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      1 dnl Check whether limits.h has needed features.
      2 
      3 dnl Copyright 2016-2022 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.
      7 
      8 dnl From Paul Eggert.
      9 
     10 AC_DEFUN_ONCE([gl_LIMITS_H],
     11 [
     12   gl_CHECK_NEXT_HEADERS([limits.h])
     13 
     14   AC_CACHE_CHECK([whether limits.h has WORD_BIT, BOOL_WIDTH etc.],
     15     [gl_cv_header_limits_width],
     16     [AC_COMPILE_IFELSE(
     17        [AC_LANG_PROGRAM(
     18           [[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
     19              #define __STDC_WANT_IEC_60559_BFP_EXT__ 1
     20             #endif
     21             #include <limits.h>
     22             long long llm = LLONG_MAX;
     23             int wb = WORD_BIT;
     24             int ullw = ULLONG_WIDTH;
     25             int bw = BOOL_WIDTH;
     26           ]])],
     27        [gl_cv_header_limits_width=yes],
     28        [gl_cv_header_limits_width=no])])
     29   if test "$gl_cv_header_limits_width" = yes; then
     30     GL_GENERATE_LIMITS_H=false
     31   else
     32     GL_GENERATE_LIMITS_H=true
     33   fi
     34 ])
     35 
     36 dnl Unconditionally enables the replacement of <limits.h>.
     37 AC_DEFUN([gl_REPLACE_LIMITS_H],
     38 [
     39   AC_REQUIRE([gl_LIMITS_H])
     40   GL_GENERATE_LIMITS_H=true
     41 ])
     42