mirror of
https://github.com/coreutils/coreutils.git
synced 2025-01-03 14:43:22 +08:00
66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
# uintptr_t.m4 serial 2
|
|
|
|
# Copyright (C) 2004 Free Software Foundation, Inc.
|
|
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2, or (at your option)
|
|
# any later version.
|
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software Foundation,
|
|
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
# Written by Paul Eggert.
|
|
|
|
AC_DEFUN([gl_AC_TYPE_UINTPTR_T],
|
|
[
|
|
AC_CACHE_CHECK([for uintptr_t], gl_cv_c_uintptr_t,
|
|
[gl_cv_c_uintptr_t=no
|
|
for ac_type in "uintptr_t" "unsigned int" \
|
|
"unsigned long int" "unsigned long long int"; do
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_BOOL_COMPILE_TRY(
|
|
[AC_INCLUDES_DEFAULT],
|
|
[[sizeof (void *) <= sizeof (uintptr_t)]])],
|
|
[gl_cv_c_uintptr_t=$ac_type])
|
|
test $gl_cv_c_uintptr_t != no && break
|
|
done])
|
|
case $gl_cv_c_uintptr_t in
|
|
no|uintptr_t) ;;
|
|
*)
|
|
AC_DEFINE_UNQUOTED(uintptr_t, $gl_cv_c_uintptr_t,
|
|
[Define to the type of a unsigned integer type wide enough to
|
|
hold a pointer, if such a type exists.])
|
|
;;
|
|
esac
|
|
|
|
dnl Check whether UINTPTR_MAX is defined, not whether it has the
|
|
dnl right value. Alas, Solaris 8 defines it to empty!
|
|
dnl Applications should use (uintptr_t) -1 rather than UINTPTR_MAX.
|
|
AC_CACHE_CHECK([for UINTPTR_MAX], gl_cv_c_uintptr_max,
|
|
[AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[AC_INCLUDES_DEFAULT],
|
|
[[#ifndef UINTPTR_MAX
|
|
error: UINTPTR_MAX is not defined.
|
|
#endif]])],
|
|
[gl_cv_c_uintptr_max=yes],
|
|
[gl_cv_c_uintptr_max=no])])
|
|
case $gl_cv_c_uintptr_max,$gl_cv_c_uintptr_t in
|
|
yes,*) ;;
|
|
*,no) ;;
|
|
*)
|
|
AC_DEFINE(UINTPTR_MAX, ((uintptr_t) -1),
|
|
[Define to its maximum value if an unsigned integer type wide enough
|
|
to hold a pointer exists and the standard includes do not define
|
|
UINTPTR_MAX.])
|
|
;;
|
|
esac
|
|
])
|