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types.m4
# 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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