uint32_t.m4
1.71 KB
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# uint32_t.m4 serial 4
# Copyright (C) 2004 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# Written by Paul Eggert.
AC_DEFUN([gl_AC_TYPE_UINT32_T],
[
AC_CACHE_CHECK([for uint32_t], gl_cv_c_uint32_t,
[gl_cv_c_uint32_t=no
for ac_type in "uint32_t" "unsigned int" \
"unsigned long int" "unsigned short int"; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[[($ac_type) -1 == 4294967295U]])],
[gl_cv_c_uint32_t=$ac_type])
test "$gl_cv_c_uint32_t" != no && break
done])
case "$gl_cv_c_uint32_t" in
no|uint32_t) ;;
*)
AC_DEFINE(_UINT32_T, 1,
[Define for Solaris 2.5.1 so uint32_t typedef from <sys/synch.h>,
<pthread.h>, or <semaphore.h> is not used. If the typedef was
allowed, the #define below would cause a syntax error.])
AC_DEFINE_UNQUOTED(uint32_t, $gl_cv_c_uint32_t,
[Define to the type of a unsigned integer type of width exactly 32 bits
if such a type exists and the standard includes do not define it.])
;;
esac
AC_CACHE_CHECK([for UINT32_MAX], gl_cv_c_uint32_max,
[AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[[UINT32_MAX == 4294967295U]])],
[gl_cv_c_uint32_max=yes],
[gl_cv_c_uint32_max=no])])
case $gl_cv_c_uint32_max,$gl_cv_c_uint32_t in
yes,*) ;;
*,no) ;;
*)
AC_DEFINE(UINT32_MAX, 4294967295U,
[Define to its maximum value if an unsigned integer type of width
exactly 32 bits exists and the standard includes do not define
UINT32_MAX.])
;;
esac
])