32 lines
1 KiB
Plaintext
32 lines
1 KiB
Plaintext
|
dnl Check whether limits.h has needed features.
|
||
|
|
|
||
|
|
dnl Copyright 2016-2018 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"])
|
||
|
|
])
|