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-rw-r--r--gl/m4/limits-h.m431
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+dnl Check whether limits.h has needed features.
+
+dnl Copyright 2016-2017 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 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>
+ 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"])
+])