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dnl Check whether limits.h has needed features.
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dnl Copyright 2016-2017 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 ULLONG_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([[#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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int ullw = ULLONG_WIDTH;]])],
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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 "$gl_cv_header_limits_width" = yes; then
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LIMITS_H=
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else
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LIMITS_H=limits.h
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fi
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AC_SUBST([LIMITS_H])
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AM_CONDITIONAL([GL_GENERATE_LIMITS_H], [test -n "$LIMITS_H"])
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])
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