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# This file is part of Autoconf. -*- Autoconf -*-
# Type related macros: existence, sizeof, and structure members.
#
# Copyright (C) 2000-2002, 2004-2012 Free Software Foundation, Inc.
# This file is part of Autoconf. 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 3 of the License, 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.
#
# Under Section 7 of GPL version 3, you are granted additional
# permissions described in the Autoconf Configure Script Exception,
# version 3.0, as published by the Free Software Foundation.
#
# You should have received a copy of the GNU General Public License
# and a copy of the Autoconf Configure Script Exception along with
# this program; see the files COPYINGv3 and COPYING.EXCEPTION
# respectively. If not, see <http://www.gnu.org/licenses/>.
# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.
## ---------------- ##
## Type existence. ##
## ---------------- ##
# ---------------- #
# General checks. #
# ---------------- #
# Up to 2.13 included, Autoconf used to provide the macro
#
# AC_CHECK_TYPE(TYPE, DEFAULT)
#
# Since, it provides another version which fits better with the other
# AC_CHECK_ families:
#
# AC_CHECK_TYPE(TYPE,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [INCLUDES = DEFAULT-INCLUDES])
#
# In order to provide backward compatibility, the new scheme is
# implemented as _AC_CHECK_TYPE_NEW, the old scheme as _AC_CHECK_TYPE_OLD,
# and AC_CHECK_TYPE branches to one or the other, depending upon its
# arguments.
# _AC_CHECK_TYPE_NEW_BODY
# -----------------------
# Shell function body for _AC_CHECK_TYPE_NEW. This macro implements the
# former task of AC_CHECK_TYPE, with one big difference though: AC_CHECK_TYPE
# used to grep in the headers, which, BTW, led to many problems until the
# extended regular expression was correct and did not give false positives.
# It turned out there are even portability issues with egrep...
#
# The most obvious way to check for a TYPE is just to compile a variable
# definition:
#
# TYPE my_var;
#
# (TYPE being the second parameter to the shell function, hence $[]2 in m4).
# Unfortunately this does not work for const qualified types in C++, where
# you need an initializer. So you think of
#
# TYPE my_var = (TYPE) 0;
#
# Unfortunately, again, this is not valid for some C++ classes.
#
# Then you look for another scheme. For instance you think of declaring
# a function which uses a parameter of type TYPE:
#
# int foo (TYPE param);
#
# but of course you soon realize this does not make it with K&R
# compilers. And by no means do you want to use this:
#
# int foo (param)
# TYPE param
# { ; }
#
# since C++ would complain loudly.
#
# Don't even think of using a function return type, since K&R cries
# there too. So you start thinking of declaring a *pointer* to this TYPE:
#
# TYPE *p;
#
# but you know fairly well that this is legal in C for aggregates which
# are unknown (TYPE = struct does-not-exist).
#
# Then you think of using sizeof to make sure the TYPE is really
# defined:
#
# sizeof (TYPE);
#
# That is great, but has one drawback: it succeeds when TYPE happens
# to be a variable: you'd get the size of the variable's type.
# Obviously, we must not accept a variable in place of a type name.
#
# So, to filter out the last possibility, we will require that this fail:
#
# sizeof ((TYPE));
#
# This evokes a syntax error when TYPE is a type, but succeeds if TYPE
# is actually a variable.
#
# Also note that we use
#
# if (sizeof (TYPE))
#
# to `read' sizeof (to avoid warnings), while not depending on its type
# (not necessarily size_t etc.).
#
# C++ disallows defining types inside `sizeof ()', but that's OK,
# since we don't want to consider unnamed structs to be types for C++,
# precisely because they don't work in cases like that.
m4_define([_AC_CHECK_TYPE_NEW_BODY],
[ AS_LINENO_PUSH([$[]1])
AC_CACHE_CHECK([for $[]2], [$[]3],
[AS_VAR_SET([$[]3], [no])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([$[]4],
[if (sizeof ($[]2))
return 0;])],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([$[]4],
[if (sizeof (($[]2)))
return 0;])],
[],
[AS_VAR_SET([$[]3], [yes])])])])
AS_LINENO_POP
])dnl
# _AC_CHECK_TYPE_NEW(TYPE,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [INCLUDES = DEFAULT-INCLUDES])
# ------------------------------------------------------------
# Check whether the type TYPE is supported by the system, maybe via the
# the provided includes.
AC_DEFUN([_AC_CHECK_TYPE_NEW],
[AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_type],
[AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_type],
[LINENO TYPE VAR INCLUDES],
[Tests whether TYPE exists after having included INCLUDES, setting
cache variable VAR accordingly.])],
[$0_BODY])]dnl
[AS_VAR_PUSHDEF([ac_Type], [ac_cv_type_$1])]dnl
[ac_fn_[]_AC_LANG_ABBREV[]_check_type "$LINENO" "$1" "ac_Type" ]dnl
["AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])"
AS_VAR_IF([ac_Type], [yes], [$2], [$3])
AS_VAR_POPDEF([ac_Type])dnl
])# _AC_CHECK_TYPE_NEW
# _AC_CHECK_TYPES(TYPE)
# ---------------------
# Helper to AC_CHECK_TYPES, which generates two of the four arguments
# to _AC_CHECK_TYPE_NEW that are based on TYPE.
m4_define([_AC_CHECK_TYPES],
[[$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]), [1],
[Define to 1 if the system has the type `$1'.])]])
# AC_CHECK_TYPES(TYPES,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [INCLUDES = DEFAULT-INCLUDES])
# --------------------------------------------------------
# TYPES is an m4 list. There are no ambiguities here, we mean the newer
# AC_CHECK_TYPE.
AC_DEFUN([AC_CHECK_TYPES],
[m4_map_args_sep([_AC_CHECK_TYPE_NEW(_$0(], [)[
$2], [$3], [$4])], [], $1)])
# _AC_CHECK_TYPE_OLD(TYPE, DEFAULT)
# ---------------------------------
# FIXME: This is an extremely badly chosen name, since this
# macro actually performs an AC_REPLACE_TYPE. Some day we
# have to clean this up.
m4_define([_AC_CHECK_TYPE_OLD],
[_AC_CHECK_TYPE_NEW([$1],,
[AC_DEFINE_UNQUOTED([$1], [$2],
[Define to `$2' if <sys/types.h> does not define.])])dnl
])# _AC_CHECK_TYPE_OLD
# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P(STRING)
# -----------------------------------------
# Return `1' if STRING seems to be a builtin C/C++ type, i.e., if it
# starts with `_Bool', `bool', `char', `double', `float', `int',
# `long', `short', `signed', or `unsigned' followed by characters
# that are defining types.
# Because many people have used `off_t' and `size_t' too, they are added
# for better common-use backward compatibility.
m4_define([_AC_CHECK_TYPE_REPLACEMENT_TYPE_P],
[m4_bmatch([$1],
[^\(_Bool\|bool\|char\|double\|float\|int\|long\|short\|\(un\)?signed\|[_a-zA-Z][_a-zA-Z0-9]*_t\)[][_a-zA-Z0-9() *]*$],
1, 0)dnl
])# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P
# _AC_CHECK_TYPE_MAYBE_TYPE_P(STRING)
# -----------------------------------
# Return `1' if STRING looks like a C/C++ type.
m4_define([_AC_CHECK_TYPE_MAYBE_TYPE_P],
[m4_bmatch([$1], [^[_a-zA-Z0-9 ]+\([_a-zA-Z0-9() *]\|\[\|\]\)*$],
1, 0)dnl
])# _AC_CHECK_TYPE_MAYBE_TYPE_P
# AC_CHECK_TYPE(TYPE, DEFAULT)
# or
# AC_CHECK_TYPE(TYPE,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [INCLUDES = DEFAULT-INCLUDES])
# -------------------------------------------------------
#
# Dispatch respectively to _AC_CHECK_TYPE_OLD or _AC_CHECK_TYPE_NEW.
# 1. More than two arguments => NEW
# 2. $2 seems to be replacement type => OLD
# See _AC_CHECK_TYPE_REPLACEMENT_TYPE_P for `replacement type'.
# 3. $2 seems to be a type => NEW plus a warning
# 4. default => NEW
AC_DEFUN([AC_CHECK_TYPE],
[m4_cond([$#], [3],
[_AC_CHECK_TYPE_NEW],
[$#], [4],
[_AC_CHECK_TYPE_NEW],
[_AC_CHECK_TYPE_REPLACEMENT_TYPE_P([$2])], [1],
[_AC_CHECK_TYPE_OLD],
[_AC_CHECK_TYPE_MAYBE_TYPE_P([$2])], [1],
[AC_DIAGNOSE([syntax],
[$0: assuming `$2' is not a type])_AC_CHECK_TYPE_NEW],
[_AC_CHECK_TYPE_NEW])($@)])# AC_CHECK_TYPE
# ---------------------------- #
# Types that must be checked. #
# ---------------------------- #
AN_IDENTIFIER([ptrdiff_t], [AC_CHECK_TYPES])
# ----------------- #
# Specific checks. #
# ----------------- #
# AC_TYPE_GETGROUPS
# -----------------
AC_DEFUN([AC_TYPE_GETGROUPS],
[AC_REQUIRE([AC_TYPE_UID_T])dnl
AC_CACHE_CHECK(type of array argument to getgroups, ac_cv_type_getgroups,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[/* Thanks to Mike Rendell for this test. */
]AC_INCLUDES_DEFAULT[
#define NGID 256
#undef MAX
#define MAX(x, y) ((x) > (y) ? (x) : (y))
int
main ()
{
gid_t gidset[NGID];
int i, n;
union { gid_t gval; long int lval; } val;
val.lval = -1;
for (i = 0; i < NGID; i++)
gidset[i] = val.gval;
n = getgroups (sizeof (gidset) / MAX (sizeof (int), sizeof (gid_t)) - 1,
gidset);
/* Exit non-zero if getgroups seems to require an array of ints. This
happens when gid_t is short int but getgroups modifies an array
of ints. */
return n > 0 && gidset[n] != val.gval;
}]])],
[ac_cv_type_getgroups=gid_t],
[ac_cv_type_getgroups=int],
[ac_cv_type_getgroups=cross])
if test $ac_cv_type_getgroups = cross; then
dnl When we can't run the test program (we are cross compiling), presume
dnl that <unistd.h> has either an accurate prototype for getgroups or none.
dnl Old systems without prototypes probably use int.
AC_EGREP_HEADER([getgroups.*int.*gid_t], unistd.h,
ac_cv_type_getgroups=gid_t, ac_cv_type_getgroups=int)
fi])
AC_DEFINE_UNQUOTED(GETGROUPS_T, $ac_cv_type_getgroups,
[Define to the type of elements in the array set by
`getgroups'. Usually this is either `int' or `gid_t'.])
])# AC_TYPE_GETGROUPS
# AU::AM_TYPE_PTRDIFF_T
# ---------------------
AU_DEFUN([AM_TYPE_PTRDIFF_T],
[AC_CHECK_TYPES(ptrdiff_t)])
# AC_TYPE_INTMAX_T
# ----------------
AC_DEFUN([AC_TYPE_INTMAX_T],
[
AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
AC_CHECK_TYPE([intmax_t],
[AC_DEFINE([HAVE_INTMAX_T], 1,
[Define to 1 if the system has the type `intmax_t'.])],
[test $ac_cv_type_long_long_int = yes \
&& ac_type='long long int' \
|| ac_type='long int'
AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
[Define to the widest signed integer type
if <stdint.h> and <inttypes.h> do not define.])])
])
# AC_TYPE_UINTMAX_T
# -----------------
AC_DEFUN([AC_TYPE_UINTMAX_T],
[
AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
AC_CHECK_TYPE([uintmax_t],
[AC_DEFINE([HAVE_UINTMAX_T], 1,
[Define to 1 if the system has the type `uintmax_t'.])],
[test $ac_cv_type_unsigned_long_long_int = yes \
&& ac_type='unsigned long long int' \
|| ac_type='unsigned long int'
AC_DEFINE_UNQUOTED([uintmax_t], [$ac_type],
[Define to the widest unsigned integer type
if <stdint.h> and <inttypes.h> do not define.])])
])
# AC_TYPE_INTPTR_T
# ----------------
AC_DEFUN([AC_TYPE_INTPTR_T],
[
AC_CHECK_TYPE([intptr_t],
[AC_DEFINE([HAVE_INTPTR_T], 1,
[Define to 1 if the system has the type `intptr_t'.])],
[for ac_type in 'int' 'long int' 'long long int'; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[[sizeof (void *) <= sizeof ($ac_type)]])],
[AC_DEFINE_UNQUOTED([intptr_t], [$ac_type],
[Define to the type of a signed integer type wide enough to
hold a pointer, if such a type exists, and if the system
does not define it.])
ac_type=])
test -z "$ac_type" && break
done])
])
# AC_TYPE_UINTPTR_T
# -----------------
AC_DEFUN([AC_TYPE_UINTPTR_T],
[
AC_CHECK_TYPE([uintptr_t],
[AC_DEFINE([HAVE_UINTPTR_T], 1,
[Define to 1 if the system has the type `uintptr_t'.])],
[for ac_type in 'unsigned int' 'unsigned long int' \
'unsigned long long int'; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[[sizeof (void *) <= sizeof ($ac_type)]])],
[AC_DEFINE_UNQUOTED([uintptr_t], [$ac_type],
[Define to the type of an unsigned integer type wide enough to
hold a pointer, if such a type exists, and if the system
does not define it.])
ac_type=])
test -z "$ac_type" && break
done])
])
# AC_TYPE_LONG_DOUBLE
# -------------------
AC_DEFUN([AC_TYPE_LONG_DOUBLE],
[
AC_CACHE_CHECK([for long double], [ac_cv_type_long_double],
[if test "$GCC" = yes; then
ac_cv_type_long_double=yes
else
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[[/* The Stardent Vistra knows sizeof (long double), but does
not support it. */
long double foo = 0.0L;]],
[[/* On Ultrix 4.3 cc, long double is 4 and double is 8. */
sizeof (double) <= sizeof (long double)]])],
[ac_cv_type_long_double=yes],
[ac_cv_type_long_double=no])
fi])
if test $ac_cv_type_long_double = yes; then
AC_DEFINE([HAVE_LONG_DOUBLE], 1,
[Define to 1 if the system has the type `long double'.])
fi
])
# AC_TYPE_LONG_DOUBLE_WIDER
# -------------------------
AC_DEFUN([AC_TYPE_LONG_DOUBLE_WIDER],
[
AC_CACHE_CHECK(
[for long double with more range or precision than double],
[ac_cv_type_long_double_wider],
[AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[[#include <float.h>
long double const a[] =
{
0.0L, DBL_MIN, DBL_MAX, DBL_EPSILON,
LDBL_MIN, LDBL_MAX, LDBL_EPSILON
};
long double
f (long double x)
{
return ((x + (unsigned long int) 10) * (-1 / x) + a[0]
+ (x ? f (x) : 'c'));
}
]],
[[(0 < ((DBL_MAX_EXP < LDBL_MAX_EXP)
+ (DBL_MANT_DIG < LDBL_MANT_DIG)
- (LDBL_MAX_EXP < DBL_MAX_EXP)
- (LDBL_MANT_DIG < DBL_MANT_DIG)))
&& (int) LDBL_EPSILON == 0
]])],
ac_cv_type_long_double_wider=yes,
ac_cv_type_long_double_wider=no)])
if test $ac_cv_type_long_double_wider = yes; then
AC_DEFINE([HAVE_LONG_DOUBLE_WIDER], 1,
[Define to 1 if the type `long double' works and has more range or
precision than `double'.])
fi
])# AC_TYPE_LONG_DOUBLE_WIDER
# AC_C_LONG_DOUBLE
# ----------------
AU_DEFUN([AC_C_LONG_DOUBLE],
[
AC_TYPE_LONG_DOUBLE_WIDER
ac_cv_c_long_double=$ac_cv_type_long_double_wider
if test $ac_cv_c_long_double = yes; then
AC_DEFINE([HAVE_LONG_DOUBLE], 1,
[Define to 1 if the type `long double' works and has more range or
precision than `double'.])
fi
],
[The macro `AC_C_LONG_DOUBLE' is obsolete.
You should use `AC_TYPE_LONG_DOUBLE' or `AC_TYPE_LONG_DOUBLE_WIDER' instead.]
)
# _AC_TYPE_LONG_LONG_SNIPPET
# --------------------------
# Expands to a C program that can be used to test for simultaneous support
# of 'long long' and 'unsigned long long'. We don't want to say that
# 'long long' is available if 'unsigned long long' is not, or vice versa,
# because too many programs rely on the symmetry between signed and unsigned
# integer types (excluding 'bool').
AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
[
AC_LANG_PROGRAM(
[[/* For now, do not test the preprocessor; as of 2007 there are too many
implementations with broken preprocessors. Perhaps this can
be revisited in 2012. In the meantime, code should not expect
#if to work with literals wider than 32 bits. */
/* Test literals. */
long long int ll = 9223372036854775807ll;
long long int nll = -9223372036854775807LL;
unsigned long long int ull = 18446744073709551615ULL;
/* Test constant expressions. */
typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
? 1 : -1)];
typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
? 1 : -1)];
int i = 63;]],
[[/* Test availability of runtime routines for shift and division. */
long long int llmax = 9223372036854775807ll;
unsigned long long int ullmax = 18446744073709551615ull;
return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
| (llmax / ll) | (llmax % ll)
| (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
| (ullmax / ull) | (ullmax % ull));]])
])
# AC_TYPE_LONG_LONG_INT
# ---------------------
AC_DEFUN([AC_TYPE_LONG_LONG_INT],
[
AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
[ac_cv_type_long_long_int=yes
if test "x${ac_cv_prog_cc_c99-no}" = xno; then
ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
if test $ac_cv_type_long_long_int = yes; then
dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
dnl If cross compiling, assume the bug is not important, since
dnl nobody cross compiles for this platform as far as we know.
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[@%:@include <limits.h>
@%:@ifndef LLONG_MAX
@%:@ define HALF \
(1LL << (sizeof (long long int) * CHAR_BIT - 2))
@%:@ define LLONG_MAX (HALF - 1 + HALF)
@%:@endif]],
[[long long int n = 1;
int i;
for (i = 0; ; i++)
{
long long int m = n << i;
if (m >> i != n)
return 1;
if (LLONG_MAX / 2 < m)
break;
}
return 0;]])],
[],
[ac_cv_type_long_long_int=no],
[:])
fi
fi])
if test $ac_cv_type_long_long_int = yes; then
AC_DEFINE([HAVE_LONG_LONG_INT], [1],
[Define to 1 if the system has the type `long long int'.])
fi
])
# AC_TYPE_UNSIGNED_LONG_LONG_INT
# ------------------------------
AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
[
AC_CACHE_CHECK([for unsigned long long int],
[ac_cv_type_unsigned_long_long_int],
[ac_cv_type_unsigned_long_long_int=yes
if test "x${ac_cv_prog_cc_c99-no}" = xno; then
AC_LINK_IFELSE(
[_AC_TYPE_LONG_LONG_SNIPPET],
[],
[ac_cv_type_unsigned_long_long_int=no])
fi])
if test $ac_cv_type_unsigned_long_long_int = yes; then
AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
[Define to 1 if the system has the type `unsigned long long int'.])
fi
])
# AC_TYPE_MBSTATE_T
# -----------------
AC_DEFUN([AC_TYPE_MBSTATE_T],
[AC_CACHE_CHECK([for mbstate_t], ac_cv_type_mbstate_t,
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[AC_INCLUDES_DEFAULT
# include <wchar.h>],
[mbstate_t x; return sizeof x;])],
[ac_cv_type_mbstate_t=yes],
[ac_cv_type_mbstate_t=no])])
if test $ac_cv_type_mbstate_t = yes; then
AC_DEFINE([HAVE_MBSTATE_T], 1,
[Define to 1 if <wchar.h> declares mbstate_t.])
else
AC_DEFINE([mbstate_t], int,
[Define to a type if <wchar.h> does not define.])
fi])
# AC_TYPE_UID_T
# -------------
# FIXME: Rewrite using AC_CHECK_TYPE.
AN_IDENTIFIER([gid_t], [AC_TYPE_UID_T])
AN_IDENTIFIER([uid_t], [AC_TYPE_UID_T])
AC_DEFUN([AC_TYPE_UID_T],
[AC_CACHE_CHECK(for uid_t in sys/types.h, ac_cv_type_uid_t,
[AC_EGREP_HEADER(uid_t, sys/types.h,
ac_cv_type_uid_t=yes, ac_cv_type_uid_t=no)])
if test $ac_cv_type_uid_t = no; then
AC_DEFINE(uid_t, int, [Define to `int' if <sys/types.h> doesn't define.])
AC_DEFINE(gid_t, int, [Define to `int' if <sys/types.h> doesn't define.])
fi
])
AN_IDENTIFIER([size_t], [AC_TYPE_SIZE_T])
AC_DEFUN([AC_TYPE_SIZE_T], [AC_CHECK_TYPE(size_t, unsigned int)])
AN_IDENTIFIER([ssize_t], [AC_TYPE_SSIZE_T])
AC_DEFUN([AC_TYPE_SSIZE_T], [AC_CHECK_TYPE(ssize_t, int)])
AN_IDENTIFIER([pid_t], [AC_TYPE_PID_T])
AC_DEFUN([AC_TYPE_PID_T], [AC_CHECK_TYPE(pid_t, int)])
AN_IDENTIFIER([off_t], [AC_TYPE_OFF_T])
AC_DEFUN([AC_TYPE_OFF_T], [AC_CHECK_TYPE(off_t, long int)])
AN_IDENTIFIER([mode_t], [AC_TYPE_MODE_T])
AC_DEFUN([AC_TYPE_MODE_T], [AC_CHECK_TYPE(mode_t, int)])
AN_IDENTIFIER([int8_t], [AC_TYPE_INT8_T])
AN_IDENTIFIER([int16_t], [AC_TYPE_INT16_T])
AN_IDENTIFIER([int32_t], [AC_TYPE_INT32_T])
AN_IDENTIFIER([int64_t], [AC_TYPE_INT64_T])
AN_IDENTIFIER([uint8_t], [AC_TYPE_UINT8_T])
AN_IDENTIFIER([uint16_t], [AC_TYPE_UINT16_T])
AN_IDENTIFIER([uint32_t], [AC_TYPE_UINT32_T])
AN_IDENTIFIER([uint64_t], [AC_TYPE_UINT64_T])
AC_DEFUN([AC_TYPE_INT8_T], [_AC_TYPE_INT(8)])
AC_DEFUN([AC_TYPE_INT16_T], [_AC_TYPE_INT(16)])
AC_DEFUN([AC_TYPE_INT32_T], [_AC_TYPE_INT(32)])
AC_DEFUN([AC_TYPE_INT64_T], [_AC_TYPE_INT(64)])
AC_DEFUN([AC_TYPE_UINT8_T], [_AC_TYPE_UNSIGNED_INT(8)])
AC_DEFUN([AC_TYPE_UINT16_T], [_AC_TYPE_UNSIGNED_INT(16)])
AC_DEFUN([AC_TYPE_UINT32_T], [_AC_TYPE_UNSIGNED_INT(32)])
AC_DEFUN([AC_TYPE_UINT64_T], [_AC_TYPE_UNSIGNED_INT(64)])
# _AC_TYPE_INT_BODY
# -----------------
# Shell function body for _AC_TYPE_INT.
m4_define([_AC_TYPE_INT_BODY],
[ AS_LINENO_PUSH([$[]1])
AC_CACHE_CHECK([for int$[]2_t], [$[]3],
[AS_VAR_SET([$[]3], [no])
# Order is important - never check a type that is potentially smaller
# than half of the expected target width.
for ac_type in int$[]2_t 'int' 'long int' \
'long long int' 'short int' 'signed char'; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT
enum { N = $[]2 / 2 - 1 };],
[0 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)])],
[AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT
enum { N = $[]2 / 2 - 1 };],
[($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)
< ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 2)])],
[],
[AS_CASE([$ac_type], [int$[]2_t],
[AS_VAR_SET([$[]3], [yes])],
[AS_VAR_SET([$[]3], [$ac_type])])])])
AS_VAR_IF([$[]3], [no], [], [break])
done])
AS_LINENO_POP
])# _AC_TYPE_INT_BODY
# _AC_TYPE_INT(NBITS)
# -------------------
# Set a variable ac_cv_c_intNBITS_t to `yes' if intNBITS_t is available,
# `no' if it is not and no replacement types could be found, and a C type
# if it is not available but a replacement signed integer type of width
# exactly NBITS bits was found. In the third case, intNBITS_t is AC_DEFINEd
# to type, as well.
AC_DEFUN([_AC_TYPE_INT],
[AC_REQUIRE_SHELL_FN([ac_fn_c_find_intX_t],
[AS_FUNCTION_DESCRIBE([ac_fn_c_find_intX_t], [LINENO BITS VAR],
[Finds a signed integer type with width BITS, setting cache variable VAR
accordingly.])],
[$0_BODY])]dnl
[ac_fn_c_find_intX_t "$LINENO" "$1" "ac_cv_c_int$1_t"
case $ac_cv_c_int$1_t in #(
no|yes) ;; #(
*)
AC_DEFINE_UNQUOTED([int$1_t], [$ac_cv_c_int$1_t],
[Define to the type of a signed integer type of width exactly $1 bits
if such a type exists and the standard includes do not define it.]);;
esac
])# _AC_TYPE_INT
# _AC_TYPE_UNSIGNED_INT_BODY
# --------------------------
# Shell function body for _AC_TYPE_UNSIGNED_INT.
m4_define([_AC_TYPE_UNSIGNED_INT_BODY],
[ AS_LINENO_PUSH([$[]1])
AC_CACHE_CHECK([for uint$[]2_t], $[]3,
[AS_VAR_SET([$[]3], [no])
# Order is important - never check a type that is potentially smaller
# than half of the expected target width.
for ac_type in uint$[]2_t 'unsigned int' 'unsigned long int' \
'unsigned long long int' 'unsigned short int' 'unsigned char'; do
AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[AC_INCLUDES_DEFAULT],
[(($ac_type) -1 >> ($[]2 / 2 - 1)) >> ($[]2 / 2 - 1) == 3])],
[AS_CASE([$ac_type], [uint$[]2_t],
[AS_VAR_SET([$[]3], [yes])],
[AS_VAR_SET([$[]3], [$ac_type])])])
AS_VAR_IF([$[]3], [no], [], [break])
done])
AS_LINENO_POP
])# _AC_TYPE_UNSIGNED_INT_BODY
# _AC_TYPE_UNSIGNED_INT(NBITS)
# ----------------------------
# Set a variable ac_cv_c_uintNBITS_t to `yes' if uintNBITS_t is available,
# `no' if it is not and no replacement types could be found, and a C type
# if it is not available but a replacement unsigned integer type of width
# exactly NBITS bits was found. In the third case, uintNBITS_t is AC_DEFINEd
# to type, as well.
AC_DEFUN([_AC_TYPE_UNSIGNED_INT],
[AC_REQUIRE_SHELL_FN([ac_fn_c_find_uintX_t],
[AS_FUNCTION_DESCRIBE([ac_fn_c_find_uintX_t], [LINENO BITS VAR],
[Finds an unsigned integer type with width BITS, setting cache variable VAR
accordingly.])],
[$0_BODY])]dnl
[ac_fn_c_find_uintX_t "$LINENO" "$1" "ac_cv_c_uint$1_t"
case $ac_cv_c_uint$1_t in #(
no|yes) ;; #(
*)
m4_bmatch([$1], [^\(8\|32\|64\)$],
[AC_DEFINE([_UINT$1_T], 1,
[Define for Solaris 2.5.1 so the uint$1_t typedef from
<sys/synch.h>, <pthread.h>, or <semaphore.h> is not used.
If the typedef were allowed, the #define below would cause a
syntax error.])])
AC_DEFINE_UNQUOTED([uint$1_t], [$ac_cv_c_uint$1_t],
[Define to the type of an unsigned integer type of width exactly $1 bits
if such a type exists and the standard includes do not define it.]);;
esac
])# _AC_TYPE_UNSIGNED_INT
# AC_TYPE_SIGNAL
# --------------
# Note that identifiers starting with SIG are reserved by ANSI C.
# C89 requires signal handlers to return void; only K&R returned int;
# modern code does not need to worry about using this macro (not to
# mention that sigaction is better than signal).
AU_DEFUN([AC_TYPE_SIGNAL],
[AC_CACHE_CHECK([return type of signal handlers], ac_cv_type_signal,
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <sys/types.h>
#include <signal.h>
],
[return *(signal (0, 0)) (0) == 1;])],
[ac_cv_type_signal=int],
[ac_cv_type_signal=void])])
AC_DEFINE_UNQUOTED(RETSIGTYPE, $ac_cv_type_signal,
[Define as the return type of signal handlers
(`int' or `void').])
], [your code may safely assume C89 semantics that RETSIGTYPE is void.
Remove this warning and the `AC_CACHE_CHECK' when you adjust the code.])
## ------------------------ ##
## Checking size of types. ##
## ------------------------ ##
# ---------------- #
# Generic checks. #
# ---------------- #
# AC_CHECK_SIZEOF(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------------
AC_DEFUN([AC_CHECK_SIZEOF],
[AS_LITERAL_IF(m4_translit([[$1]], [*], [p]), [],
[m4_fatal([$0: requires literal arguments])])]dnl
[# The cast to long int works around a bug in the HP C Compiler
# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
# This bug is HP SR number 8606223364.
_AC_CACHE_CHECK_INT([size of $1], [AS_TR_SH([ac_cv_sizeof_$1])],
[(long int) (sizeof ($1))],
[AC_INCLUDES_DEFAULT([$3])],
[if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
AC_MSG_FAILURE([cannot compute sizeof ($1)], 77)
else
AS_TR_SH([ac_cv_sizeof_$1])=0
fi])
AC_DEFINE_UNQUOTED(AS_TR_CPP(sizeof_$1), $AS_TR_SH([ac_cv_sizeof_$1]),
[The size of `$1', as computed by sizeof.])
])# AC_CHECK_SIZEOF
# AC_CHECK_ALIGNOF(TYPE, [INCLUDES = DEFAULT-INCLUDES])
# -----------------------------------------------------
# TYPE can include braces and semicolon, which AS_TR_CPP and AS_TR_SH
# (correctly) recognize as potential shell metacharacters. So we
# have to flatten problematic characters ourselves to guarantee that
# AC_DEFINE_UNQUOTED will see a literal.
AC_DEFUN([AC_CHECK_ALIGNOF],
[m4_if(m4_index(m4_translit([[$1]], [`\"], [$]), [$]), [-1], [],
[m4_fatal([$0: requires literal arguments])])]dnl
[_$0([$1], [$2], m4_translit([[$1]], [{;}], [___]))])
m4_define([_AC_CHECK_ALIGNOF],
[# The cast to long int works around a bug in the HP C Compiler,
# see AC_CHECK_SIZEOF for more information.
_AC_CACHE_CHECK_INT([alignment of $1], [AS_TR_SH([ac_cv_alignof_$3])],
[(long int) offsetof (ac__type_alignof_, y)],
[AC_INCLUDES_DEFAULT([$2])
#ifndef offsetof
# define offsetof(type, member) ((char *) &((type *) 0)->member - (char *) 0)
#endif
typedef struct { char x; $1 y; } ac__type_alignof_;],
[if test "$AS_TR_SH([ac_cv_type_$3])" = yes; then
AC_MSG_FAILURE([cannot compute alignment of $1], 77)
else
AS_TR_SH([ac_cv_alignof_$3])=0
fi])
AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$3), $AS_TR_SH([ac_cv_alignof_$3]),
[The normal alignment of `$1', in bytes.])
])# AC_CHECK_ALIGNOF
# AU::AC_INT_16_BITS
# ------------------
# What a great name :)
AU_DEFUN([AC_INT_16_BITS],
[AC_CHECK_SIZEOF([int])
test $ac_cv_sizeof_int = 2 &&
AC_DEFINE(INT_16_BITS, 1,
[Define to 1 if `sizeof (int)' = 2. Obsolete, use `SIZEOF_INT'.])
], [your code should no longer depend upon `INT_16_BITS', but upon
`SIZEOF_INT == 2'. Remove this warning and the `AC_DEFINE' when you
adjust the code.])
# AU::AC_LONG_64_BITS
# -------------------
AU_DEFUN([AC_LONG_64_BITS],
[AC_CHECK_SIZEOF([long int])
test $ac_cv_sizeof_long_int = 8 &&
AC_DEFINE(LONG_64_BITS, 1,
[Define to 1 if `sizeof (long int)' = 8. Obsolete, use
`SIZEOF_LONG_INT'.])
], [your code should no longer depend upon `LONG_64_BITS', but upon
`SIZEOF_LONG_INT == 8'. Remove this warning and the `AC_DEFINE' when
you adjust the code.])
## -------------------------- ##
## Generic structure checks. ##
## -------------------------- ##
# ---------------- #
# Generic checks. #
# ---------------- #
# _AC_CHECK_MEMBER_BODY
# ---------------------
# Shell function body for AC_CHECK_MEMBER.
m4_define([_AC_CHECK_MEMBER_BODY],
[ AS_LINENO_PUSH([$[]1])
AC_CACHE_CHECK([for $[]2.$[]3], [$[]4],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]5],
[static $[]2 ac_aggr;
if (ac_aggr.$[]3)
return 0;])],
[AS_VAR_SET([$[]4], [yes])],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]5],
[static $[]2 ac_aggr;
if (sizeof ac_aggr.$[]3)
return 0;])],
[AS_VAR_SET([$[]4], [yes])],
[AS_VAR_SET([$[]4], [no])])])])
AS_LINENO_POP
])dnl
# AC_CHECK_MEMBER(AGGREGATE.MEMBER,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------
# AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos', shell
# variables are not a valid argument.
AC_DEFUN([AC_CHECK_MEMBER],
[AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_member],
[AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_member],
[LINENO AGGR MEMBER VAR INCLUDES],
[Tries to find if the field MEMBER exists in type AGGR, after including
INCLUDES, setting cache variable VAR accordingly.])],
[_$0_BODY])]dnl
[AS_LITERAL_IF([$1], [], [m4_fatal([$0: requires literal arguments])])]dnl
[m4_if(m4_index([$1], [.]), [-1],
[m4_fatal([$0: Did not see any dot in `$1'])])]dnl
[AS_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])]dnl
[ac_fn_[]_AC_LANG_ABBREV[]_check_member "$LINENO" ]dnl
[m4_bpatsubst([$1], [^\([^.]*\)\.\(.*\)], ["\1" "\2"]) "ac_Member" ]dnl
["AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])"
AS_VAR_IF([ac_Member], [yes], [$2], [$3])
AS_VAR_POPDEF([ac_Member])dnl
])# AC_CHECK_MEMBER
# _AC_CHECK_MEMBERS(AGGREGATE.MEMBER)
# -----------------------------------
# Helper to AC_CHECK_MEMBERS, which generates two of the four
# arguments to AC_CHECK_MEMBER that are based on AGGREGATE and MEMBER.
m4_define([_AC_CHECK_MEMBERS],
[[$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]), [1],
[Define to 1 if `]m4_bpatsubst([$1],
[^\([^.]*\)\.\(.*\)], [[\2' is a member of `\1]])['.])]])
# AC_CHECK_MEMBERS([AGGREGATE.MEMBER, ...],
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [INCLUDES = DEFAULT-INCLUDES])
# ----------------------------------------------------------
# The first argument is an m4 list.
AC_DEFUN([AC_CHECK_MEMBERS],
[m4_map_args_sep([AC_CHECK_MEMBER(_$0(], [)[
$2], [$3], [$4])], [], $1)])
# ------------------------------------------------------- #
# Members that ought to be tested with AC_CHECK_MEMBERS. #
# ------------------------------------------------------- #
AN_IDENTIFIER([st_blksize], [AC_CHECK_MEMBERS([struct stat.st_blksize])])
AN_IDENTIFIER([st_rdev], [AC_CHECK_MEMBERS([struct stat.st_rdev])])
# Alphabetic order, please.
# _AC_STRUCT_DIRENT(MEMBER)
# -------------------------
AC_DEFUN([_AC_STRUCT_DIRENT],
[
AC_REQUIRE([AC_HEADER_DIRENT])
AC_CHECK_MEMBERS([struct dirent.$1], [], [],
[[
#include <sys/types.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
]])
])
# AC_STRUCT_DIRENT_D_INO
# ----------------------
AC_DEFUN([AC_STRUCT_DIRENT_D_INO], [_AC_STRUCT_DIRENT([d_ino])])
# AC_STRUCT_DIRENT_D_TYPE
# -----------------------
AC_DEFUN([AC_STRUCT_DIRENT_D_TYPE], [_AC_STRUCT_DIRENT([d_type])])
# AC_STRUCT_ST_BLKSIZE
# --------------------
AU_DEFUN([AC_STRUCT_ST_BLKSIZE],
[AC_CHECK_MEMBERS([struct stat.st_blksize],
[AC_DEFINE(HAVE_ST_BLKSIZE, 1,
[Define to 1 if your `struct stat' has
`st_blksize'. Deprecated, use
`HAVE_STRUCT_STAT_ST_BLKSIZE' instead.])])
], [your code should no longer depend upon `HAVE_ST_BLKSIZE', but
`HAVE_STRUCT_STAT_ST_BLKSIZE'. Remove this warning and
the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_BLKSIZE
# AC_STRUCT_ST_BLOCKS
# -------------------
# If `struct stat' contains an `st_blocks' member, define
# HAVE_STRUCT_STAT_ST_BLOCKS. Otherwise, add `fileblocks.o' to the
# output variable LIBOBJS. We still define HAVE_ST_BLOCKS for backward
# compatibility. In the future, we will activate specializations for
# this macro, so don't obsolete it right now.
#
# AC_OBSOLETE([$0], [; replace it with
# AC_CHECK_MEMBERS([struct stat.st_blocks],
# [AC_LIBOBJ([fileblocks])])
# Please note that it will define `HAVE_STRUCT_STAT_ST_BLOCKS',
# and not `HAVE_ST_BLOCKS'.])dnl
#
AN_IDENTIFIER([st_blocks], [AC_STRUCT_ST_BLOCKS])
AC_DEFUN([AC_STRUCT_ST_BLOCKS],
[AC_CHECK_MEMBERS([struct stat.st_blocks],
[AC_DEFINE(HAVE_ST_BLOCKS, 1,
[Define to 1 if your `struct stat' has
`st_blocks'. Deprecated, use
`HAVE_STRUCT_STAT_ST_BLOCKS' instead.])],
[AC_LIBOBJ([fileblocks])])
])# AC_STRUCT_ST_BLOCKS
# AC_STRUCT_ST_RDEV
# -----------------
AU_DEFUN([AC_STRUCT_ST_RDEV],
[AC_CHECK_MEMBERS([struct stat.st_rdev],
[AC_DEFINE(HAVE_ST_RDEV, 1,
[Define to 1 if your `struct stat' has `st_rdev'.
Deprecated, use `HAVE_STRUCT_STAT_ST_RDEV'
instead.])])
], [your code should no longer depend upon `HAVE_ST_RDEV', but
`HAVE_STRUCT_STAT_ST_RDEV'. Remove this warning and
the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_RDEV
# AC_STRUCT_TM
# ------------
# FIXME: This macro is badly named, it should be AC_CHECK_TYPE_STRUCT_TM.
# Or something else, but what? AC_CHECK_TYPE_STRUCT_TM_IN_SYS_TIME?
AC_DEFUN([AC_STRUCT_TM],
[AC_CACHE_CHECK([whether struct tm is in sys/time.h or time.h],
ac_cv_struct_tm,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <time.h>
],
[struct tm tm;
int *p = &tm.tm_sec;
return !p;])],
[ac_cv_struct_tm=time.h],
[ac_cv_struct_tm=sys/time.h])])
if test $ac_cv_struct_tm = sys/time.h; then
AC_DEFINE(TM_IN_SYS_TIME, 1,
[Define to 1 if your <sys/time.h> declares `struct tm'.])
fi
])# AC_STRUCT_TM
# AC_STRUCT_TIMEZONE
# ------------------
# Figure out how to get the current timezone. If `struct tm' has a
# `tm_zone' member, define `HAVE_TM_ZONE'. Otherwise, if the
# external array `tzname' is found, define `HAVE_TZNAME'.
AN_IDENTIFIER([tm_zone], [AC_STRUCT_TIMEZONE])
AC_DEFUN([AC_STRUCT_TIMEZONE],
[AC_REQUIRE([AC_STRUCT_TM])dnl
AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
#include <$ac_cv_struct_tm>
])
if test "$ac_cv_member_struct_tm_tm_zone" = yes; then
AC_DEFINE(HAVE_TM_ZONE, 1,
[Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
`HAVE_STRUCT_TM_TM_ZONE' instead.])
else
AC_CHECK_DECLS([tzname], , , [#include <time.h>])
AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
[AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[#include <time.h>
#if !HAVE_DECL_TZNAME
extern char *tzname[];
#endif
]],
[[return tzname[0][0];]])],
[ac_cv_var_tzname=yes],
[ac_cv_var_tzname=no])])
if test $ac_cv_var_tzname = yes; then
AC_DEFINE(HAVE_TZNAME, 1,
[Define to 1 if you don't have `tm_zone' but do have the external
array `tzname'.])
fi
fi
])# AC_STRUCT_TIMEZONE
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