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-rw-r--r--gl/m4/limits-h.m441
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1dnl Check whether limits.h has needed features.
2
3dnl Copyright 2016-2023 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8dnl From Paul Eggert.
9
10AC_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
36dnl Unconditionally enables the replacement of <limits.h>.
37AC_DEFUN([gl_REPLACE_LIMITS_H],
38[
39 AC_REQUIRE([gl_LIMITS_H])
40 GL_GENERATE_LIMITS_H=true
41])