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55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
dnl Check whether limits.h has needed features.
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dnl Copyright 2016-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Paul Eggert.
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AC_DEFUN_ONCE([gl_LIMITS_H],
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[
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gl_CHECK_NEXT_HEADERS([limits.h])
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AC_CACHE_CHECK([whether limits.h has WORD_BIT, BOOL_WIDTH etc.],
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[gl_cv_header_limits_width],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
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#define __STDC_WANT_IEC_60559_BFP_EXT__ 1
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#endif
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#include <limits.h>
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long long llm = LLONG_MAX;
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int wb = WORD_BIT;
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int ullw = ULLONG_WIDTH;
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int bw = BOOL_WIDTH;
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int bm = BOOL_MAX;
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int mblm = MB_LEN_MAX;
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]])],
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[gl_cv_header_limits_width=yes],
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[gl_cv_header_limits_width=no])])
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GL_GENERATE_LIMITS_H=true
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AS_IF([test "$gl_cv_header_limits_width" = yes],
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[AC_CACHE_CHECK([whether limits.h has SSIZE_MAX],
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[gl_cv_header_limits_ssize_max],
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[AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE(
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[[#include <limits.h>
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#ifndef SSIZE_MAX
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#error "SSIZE_MAX is not defined"
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#endif
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]])],
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[gl_cv_header_limits_ssize_max=yes],
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[gl_cv_header_limits_ssize_max=no])])
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if test "$gl_cv_header_limits_ssize_max" = yes; then
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GL_GENERATE_LIMITS_H=false
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fi])
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])
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dnl Unconditionally enables the replacement of <limits.h>.
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AC_DEFUN([gl_REPLACE_LIMITS_H],
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[
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AC_REQUIRE([gl_LIMITS_H])
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GL_GENERATE_LIMITS_H=true
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])
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