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- dnl Check whether limits.h has needed features.
- dnl Copyright 2016-2021 Free Software Foundation, Inc.
- dnl This file is free software; the Free Software Foundation
- dnl gives unlimited permission to copy and/or distribute it,
- dnl with or without modifications, as long as this notice is preserved.
- dnl From Paul Eggert.
- AC_DEFUN_ONCE([gl_LIMITS_H],
- [
- gl_CHECK_NEXT_HEADERS([limits.h])
- AC_CACHE_CHECK([whether limits.h has LLONG_MAX, WORD_BIT, ULLONG_WIDTH etc.],
- [gl_cv_header_limits_width],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#ifndef __STDC_WANT_IEC_60559_BFP_EXT__
- #define __STDC_WANT_IEC_60559_BFP_EXT__ 1
- #endif
- #include <limits.h>
- long long llm = LLONG_MAX;
- int wb = WORD_BIT;
- int ullw = ULLONG_WIDTH;
- ]])],
- [gl_cv_header_limits_width=yes],
- [gl_cv_header_limits_width=no])])
- if test "$gl_cv_header_limits_width" = yes; then
- LIMITS_H=
- else
- LIMITS_H=limits.h
- fi
- AC_SUBST([LIMITS_H])
- AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"])
- ])
- dnl Unconditionally enables the replacement of <limits.h>.
- AC_DEFUN([gl_REPLACE_LIMITS_H],
- [
- AC_REQUIRE([gl_LIMITS_H])
- LIMITS_H='limits.h'
- AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"])
- ])
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