mirror of
https://github.com/coreutils/coreutils.git
synced 2024-11-24 10:23:31 +08:00
47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
# ullong_max.m4 - define ULLONG_MAX if necessary
|
|
|
|
dnl Copyright (C) 2005 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.
|
|
|
|
# Written by Paul Eggert.
|
|
|
|
AC_DEFUN([gl_ULLONG_MAX],
|
|
[
|
|
dnl Avoid _AC_COMPUTE_INT-related macros, as they may not work with
|
|
dnl types wider than long int, due to problems with expr.
|
|
AC_CACHE_CHECK([for ULLONG_MAX], gl_cv_ullong_max,
|
|
[gl_cv_ullong_max=no
|
|
AC_EGREP_CPP([ULLONG_MAX is defined],
|
|
[
|
|
#include <limits.h>
|
|
#ifdef ULLONG_MAX
|
|
"ULLONG_MAX is defined"
|
|
#endif
|
|
],
|
|
[gl_cv_ullong_max=yes])
|
|
case $gl_cv_ullong_max in
|
|
no)
|
|
for gl_expr in \
|
|
18446744073709551615ULL \
|
|
4722366482869645213695ULL \
|
|
340282366920938463463374607431768211455ULL
|
|
do
|
|
AC_TRY_COMPILE([],
|
|
[char test[$gl_expr == (unsigned long long int) -1 ? 1 : -1];
|
|
static unsigned long long int i = $gl_expr;
|
|
return i && test;],
|
|
[gl_cv_ullong_max=$gl_expr])
|
|
test $gl_cv_ullong_max != no && break
|
|
done
|
|
esac])
|
|
case $gl_cv_ullong_max in
|
|
yes | no) ;;
|
|
*)
|
|
AC_DEFINE_UNQUOTED([ULLONG_MAX], [$gl_cv_ullong_max],
|
|
[Define as the maximum value of the type 'unsigned long long int',
|
|
if the system doesn't define it, and if the system has that type.]);;
|
|
esac
|
|
])
|