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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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]])], |
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[gl_cv_header_limits_width=yes], |
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[gl_cv_header_limits_width=no])]) |
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if test "$gl_cv_header_limits_width" = yes; then |
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GL_GENERATE_LIMITS_H=false |
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else |
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GL_GENERATE_LIMITS_H=true |
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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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