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Edit File: headers.m4

# This file is part of Autoconf. -*- Autoconf -*- # Checking for headers. # # Copyright (C) 1988, 1999-2004, 2006, 2008-2017, 2020-2021 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 <https://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. # Table of contents # # 1. Generic tests for headers # 2. Default includes # 3. Headers to tests with AC_CHECK_HEADERS # 4. Tests for specific headers ## ------------------------------ ## ## 1. Generic tests for headers. ## ## ------------------------------ ## # AC_CHECK_HEADER(HEADER-FILE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # --------------------------------------------------------- # This used to check for headers using the preprocessor only, but we # have now switched to running a full compilation, so that we learn # about the usability of a header instead of its mere presence. # The old behavior is still available by specifying `-' as the # INCLUDES, but this triggers a deprecation warning. # # The m4_indir allows for fewer expansions of $@. AC_DEFUN([AC_CHECK_HEADER], [m4_indir(m4_if([$4], [-], [[_AC_CHECK_HEADER_PREPROC]], [[_AC_CHECK_HEADER_COMPILE]]), $@)]) # _AC_CHECK_HEADER_COMPILE_BODY # ----------------------------- # Shell function body for _AC_CHECK_HEADER_COMPILE m4_define([_AC_CHECK_HEADER_COMPILE_BODY], [ AS_LINENO_PUSH([$[]1]) AC_CACHE_CHECK([for $[]2], [$[]3], [AC_COMPILE_IFELSE([AC_LANG_SOURCE([$[]4 @%:@include <$[]2>])], [AS_VAR_SET([$[]3], [yes])], [AS_VAR_SET([$[]3], [no])])]) AS_LINENO_POP ])# _AC_CHECK_HEADER_COMPILE_BODY m4_define([_AC_CHECK_HEADER_COMPILE_FN], [AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_header_compile], [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_header_compile], [LINENO HEADER VAR INCLUDES], [Tests whether HEADER exists and can be compiled using the include files in INCLUDES, setting the cache variable VAR accordingly.])], [_AC_CHECK_HEADER_COMPILE_BODY])]) # _AC_CHECK_HEADER_COMPILE(HEADER-FILE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # -------------------------------------------------------------- # Check the compiler accepts HEADER-FILE. The INCLUDES are defaulted. AC_DEFUN([_AC_CHECK_HEADER_COMPILE], [_AC_CHECK_HEADER_COMPILE_FN()]dnl [AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])]dnl [ac_fn_[]_AC_LANG_ABBREV[]_check_header_compile ]dnl ["$LINENO" "$1" "ac_Header" "AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])" AS_VAR_IF([ac_Header], [yes], [$2], [$3]) AS_VAR_POPDEF([ac_Header])])# _AC_CHECK_HEADER_COMPILE # _AC_CHECK_HEADER_PREPROC_BODY # ----------------------------- # Shell function body for _AC_CHECK_HEADER_PREPROC. m4_define([_AC_CHECK_HEADER_PREPROC_BODY], [ AS_LINENO_PUSH([$[]1]) AC_CACHE_CHECK([for $[]2], [$[]3], [AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <$[]2>])], [AS_VAR_SET([$[]3], [yes])], [AS_VAR_SET([$[]3], [no])])]) AS_LINENO_POP ])# _AC_CHECK_HEADER_PREPROC_BODY # _AC_CHECK_HEADER_PREPROC(HEADER-FILE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # -------------------------------------------------------------- # Check the preprocessor accepts HEADER-FILE. AC_DEFUN([_AC_CHECK_HEADER_PREPROC], [m4_warn([obsolete], [Checking for headers with the preprocessor is deprecated. Specify prerequisite code to AC_CHECK_HEADER instead of using fourth argument `-'. (Many headers need no prerequisites. If you truly need to test whether something passes the preprocessor but not the compiler, use AC_PREPROC_IFELSE.)])]dnl [AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_header_preproc], [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_header_preproc], [LINENO HEADER VAR], [Tests whether HEADER exists and can be preprocessed (in isolation), setting the cache variable VAR accordingly.])], [$0_BODY])]dnl [AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])]dnl [ac_fn_[]_AC_LANG_ABBREV[]_check_header_preproc "$LINENO" "$1" "ac_Header" AS_VAR_IF([ac_Header], [yes], [$2], [$3]) AS_VAR_POPDEF([ac_Header])])# _AC_CHECK_HEADER_PREPROC # _AC_CHECK_HEADER_OLD(HEADER-FILE, [ACTION-IF-FOUND], # [ACTION-IF-NOT-FOUND]) # _AC_CHECK_HEADER_NEW(HEADER-FILE, [ACTION-IF-FOUND], # [ACTION-IF-NOT-FOUND]) # ---------------------------------------------------- # Some packages used these undocumented macros. Even worse, gcc # redefined AC_CHECK_HEADER in terms of _AC_CHECK_HEADER_OLD, so we # can't do the simpler: # AU_DEFUN([_AC_CHECK_HEADER_OLD], # [AC_CHECK_HEADER([$1], [$2], [$3], [-])]) AC_DEFUN([_AC_CHECK_HEADER_OLD], [m4_warn([obsolete], [The macro `$0' is obsolete. You should use AC_CHECK_HEADER with a fourth argument.])]dnl [_AC_CHECK_HEADER_PREPROC($@)]) AC_DEFUN([_AC_CHECK_HEADER_NEW], [m4_warn([obsolete], [The macro `$0' is obsolete. You should use AC_CHECK_HEADER with a fourth argument.])]dnl [_AC_CHECK_HEADER_COMPILE($@)]) # _AC_CHECK_HEADER_MONGREL(HEADER-FILE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) # ------------------------------------------------------------------ # In case anyone used this undocumented macro. Map to the _PREPROC # semantics to minimize the chance of breaking anything. AU_DEFUN([_AC_CHECK_HEADER_MONGREL], [AC_CHECK_HEADER([$1], [$2], [$3], [-])]) # _AH_CHECK_HEADER(HEADER-FILE) # ----------------------------- # Prepare the autoheader snippet for HEADER-FILE. m4_define([_AH_CHECK_HEADER], [AH_TEMPLATE(AS_TR_CPP([HAVE_$1]), [Define to 1 if you have the <$1> header file.])]) # AH_CHECK_HEADERS(HEADER-FILE...) # -------------------------------- m4_define([AH_CHECK_HEADERS], [m4_foreach_w([AC_Header], [$1], [_AH_CHECK_HEADER(m4_defn([AC_Header]))])]) # _AC_CHECK_HEADERS_ONE_U(HEADER-FILE) # ------------------------------- # Perform the actions that need to be performed unconditionally # for every HEADER-FILE that *could* be checked for by AC_CHECK_HEADERS. m4_define([_AC_CHECK_HEADERS_ONE_U], [AS_LITERAL_WORD_IF([$1], [_AH_CHECK_HEADER([$1])], [m4_warn([syntax], [AC_CHECK_HEADERS($1): you should use literals])])]) # _AC_CHECK_HEADERS_ONE_S(HEADER-FILE, [INCLUDES]) # ------------------------------- # If HEADER-FILE exists, define HAVE_HEADER_FILE. HEADER-FILE must be literal. # Used by AC_CHECK_HEADERS for its simplest case, when its HEADER-FILE list # is fully literal and no optional actions were supplied. # INCLUDES is as for AC_CHECK_HEADER. m4_define([_AC_CHECK_HEADERS_ONE_S], [_AH_CHECK_HEADER([$1])]dnl [AC_CHECK_HEADER([$1], [AC_DEFINE(AS_TR_CPP([HAVE_$1]))], [], [$2])]) # _AC_CHECK_HEADERS_ONE_C(HEADER-FILE, [ACTION-IF-FOUND], # [ACTION-IF-NOT-FOUND], [INCLUDES]) # ------------------------------------------------------------------------- # If HEADER-FILE exists, define HAVE_HEADER-FILE and execute ACTION-IF-FOUND. # Otherwise execute ACTION-IF-NOT-FOUND. HEADER-FILE can be a shell variable. # Used by AC_CHECK_HEADERS for complex cases. # INCLUDES is as for AC_CHECK_HEADER. m4_define([_AC_CHECK_HEADERS_ONE_C], [AC_CHECK_HEADER([$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_]$1)) $2], [$3], [$4])]) # AC_CHECK_HEADERS(HEADER-FILE..., # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES]) # ---------------------------------------------------------- # Check for each whitespace-separated HEADER-FILE (omitting the <> or # ""), and perform ACTION-IF-FOUND or ACTION-IF-NOT-FOUND for each # header. INCLUDES is as for AC_CHECK_HEADER. Additionally, make the # preprocessor definition HAVE_HEADER_FILE available for each found # header. Either ACTION may include `break' to stop the search. AC_DEFUN([AC_CHECK_HEADERS], [_$0(m4_validate_w([$1]), [$2], [$3], [$4])]) m4_define([_AC_CHECK_HEADERS], [m4_if([$2$3]AS_LITERAL_IF([$1], [[yes]], [[no]]), [yes], [m4_map_args_w([$1], [_AC_CHECK_HEADERS_ONE_S(], [, [$4])])], [m4_map_args_w([$1], [_AC_CHECK_HEADERS_ONE_U(], [)])]dnl [AS_FOR([AC_header], [ac_header], [$1], [_AC_CHECK_HEADERS_ONE_C(AC_header, [$2], [$3], [$4])])])]) # _AC_CHECK_HEADER_ONCE(HEADER-FILE) # ---------------------------------- # Check for a single HEADER-FILE once. m4_define([_AC_CHECK_HEADER_ONCE], [_AH_CHECK_HEADER([$1])AC_DEFUN([_AC_Header_]m4_translit([[$1]], [./-], [___]), [m4_divert_text([INIT_PREPARE], [AS_VAR_APPEND([ac_header_]]_AC_LANG_ABBREV[[_list], [" $1 ]AS_TR_SH([$1]) AS_TR_CPP([HAVE_$1])["])])]dnl [_AC_HEADERS_EXPANSION(_AC_LANG_ABBREV)])AC_REQUIRE( [_AC_Header_]m4_translit([[$1]], [./-], [___]))]) # AC_CHECK_HEADERS_ONCE(HEADER-FILE...) # ------------------------------------- # Add each whitespace-separated name in HEADER-FILE to the list of # headers to check once. # Note: has intimate knowledge of how AC_INCLUDES_DEFAULT works, # and vice versa. AC_DEFUN([AC_CHECK_HEADERS_ONCE], [AC_REQUIRE([AC_CHECK_INCLUDES_DEFAULT])]dnl [m4_map_args_w(m4_validate_w([$1]), [_AC_CHECK_HEADER_ONCE(], [)])]) # _AC_HEADERS_EXPANSION(LANG) # --------------------------- # One-shot code per language LANG for checking all headers registered by # AC_CHECK_HEADERS_ONCE while that language was active. We have to inline # portions of AC_CHECK_HEADER_COMPILE, because although we operate on shell # variables, we know they represent literals at that point in time, # where we don't want to trigger normal AS_VAR_PUSHDEF shell code. m4_define([_AC_HEADERS_EXPANSION], [m4_ifndef([$0($1)], [m4_define([$0($1)])m4_divert_text([DEFAULTS], [ac_header_$1_list=])ac_header= ac_cache= for ac_item in $ac_header_$1_list do if test $ac_cache; then _AC_CHECK_HEADER_COMPILE_FN()ac_fn_$1_check_header_compile "$LINENO" ]dnl [$ac_header ac_cv_header_$ac_cache "$ac_includes_default" if eval test \"x\$ac_cv_header_$ac_cache\" = xyes; then printf "%s\n" "[#]define $ac_item 1" >> confdefs.h fi ac_header= ac_cache= elif test $ac_header; then ac_cache=$ac_item else ac_header=$ac_item fi done])]) ## --------------------- ## ## 2. Default includes. ## ## --------------------- ## # Always use the same set of default headers for all the generic # macros. It is easier to document, to extend, and to understand than # having specific defaults for each macro. # AC_CHECK_INCLUDES_DEFAULT # ------------------------- # Required when AC_INCLUDES_DEFAULT uses its default branch. AC_DEFUN_ONCE([AC_CHECK_INCLUDES_DEFAULT], dnl If ever you change this variable, please keep autoconf.texi in sync. [m4_divert_text([DEFAULTS], [# Factoring default headers for most tests. ac_includes_default="\ #include <stddef.h> #ifdef HAVE_STDIO_H # include <stdio.h> #endif #ifdef HAVE_STDLIB_H # include <stdlib.h> #endif #ifdef HAVE_STRING_H # include <string.h> #endif #ifdef HAVE_INTTYPES_H # include <inttypes.h> #endif #ifdef HAVE_STDINT_H # include <stdint.h> #endif #ifdef HAVE_STRINGS_H # include <strings.h> #endif #ifdef HAVE_SYS_TYPES_H # include <sys/types.h> #endif #ifdef HAVE_SYS_STAT_H # include <sys/stat.h> #endif #ifdef HAVE_UNISTD_H # include <unistd.h> #endif" ])]dnl [dnl We have to check for all the headers that aren't part of the dnl C-1990 *freestanding* environment, which is all of them except stddef.h. m4_map_args([_AC_CHECK_HEADER_ONCE], [stdio.h], [stdlib.h], [string.h], [inttypes.h], [stdint.h], [strings.h], [sys/stat.h], [sys/types.h], [unistd.h])]dnl [AS_IF([test $ac_cv_header_stdlib_h = yes && test $ac_cv_header_string_h = yes], [AC_DEFINE([STDC_HEADERS], [1], [Define to 1 if all of the C90 standard headers exist (not just the ones required in a freestanding environment). This macro is provided for backward compatibility; new code need not use it.])])]) # AC_CHECK_INCLUDES_DEFAULT # AC_INCLUDES_DEFAULT([INCLUDES]) # ------------------------------- # If INCLUDES is empty, expand in default includes, otherwise in # INCLUDES. # In most cases INCLUDES is not double quoted as it should, and if # for instance INCLUDES = `#include <stdio.h>' then unless we force # a newline, the hash will swallow the closing paren etc. etc. # The usual failure. # Take no risk: for the newline. AC_DEFUN([AC_INCLUDES_DEFAULT], [m4_ifval([$1], [$1 ], [AC_REQUIRE([AC_CHECK_INCLUDES_DEFAULT])]dnl [$ac_includes_default])]) ## ------------------------------------------- ## ## 3. Headers to check with AC_CHECK_HEADERS. ## ## ------------------------------------------- ## # There is no longer any need to check for headers that are part of # ISO C90 (as amended): assert.h, ctype.h, errno.h, float.h, iso646.h, # limits.h, locale.h, math.h, setjmp.h, signal.h, stdarg.h, stddef.h, # stdio.h, stdlib.h, string.h, time.h, wchar.h, wctype.h. AN_HEADER([OS.h], [AC_CHECK_HEADERS]) AN_HEADER([argz.h], [AC_CHECK_HEADERS]) AN_HEADER([arpa/inet.h], [AC_CHECK_HEADERS]) AN_HEADER([fcntl.h], [AC_CHECK_HEADERS]) AN_HEADER([fenv.h], [AC_CHECK_HEADERS]) AN_HEADER([fs_info.h], [AC_CHECK_HEADERS]) AN_HEADER([inttypes.h], [AC_CHECK_HEADERS]) AN_HEADER([langinfo.h], [AC_CHECK_HEADERS]) AN_HEADER([libintl.h], [AC_CHECK_HEADERS]) AN_HEADER([mach/mach.h], [AC_CHECK_HEADERS]) AN_HEADER([malloc.h], [AC_CHECK_HEADERS]) AN_HEADER([mntent.h], [AC_CHECK_HEADERS]) AN_HEADER([mnttab.h], [AC_CHECK_HEADERS]) AN_HEADER([netdb.h], [AC_CHECK_HEADERS]) AN_HEADER([netinet/in.h], [AC_CHECK_HEADERS]) AN_HEADER([nl_types.h], [AC_CHECK_HEADERS]) AN_HEADER([nlist.h], [AC_CHECK_HEADERS]) AN_HEADER([paths.h], [AC_CHECK_HEADERS]) AN_HEADER([sgtty.h], [AC_CHECK_HEADERS]) AN_HEADER([shadow.h], [AC_CHECK_HEADERS]) AN_HEADER([stdint.h], [AC_CHECK_HEADERS]) AN_HEADER([stdio_ext.h], [AC_CHECK_HEADERS]) AN_HEADER([strings.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/acl.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/file.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/filsys.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/fs/s5param.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/fs_types.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/fstyp.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/ioctl.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/mntent.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/mount.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/param.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/socket.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/statfs.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/statvfs.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/systeminfo.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/time.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/timeb.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/vfs.h], [AC_CHECK_HEADERS]) AN_HEADER([sys/window.h], [AC_CHECK_HEADERS]) AN_HEADER([syslog.h], [AC_CHECK_HEADERS]) AN_HEADER([termio.h], [AC_CHECK_HEADERS]) AN_HEADER([termios.h], [AC_CHECK_HEADERS]) AN_HEADER([unistd.h], [AC_CHECK_HEADERS]) AN_HEADER([utime.h], [AC_CHECK_HEADERS]) AN_HEADER([utmp.h], [AC_CHECK_HEADERS]) AN_HEADER([utmpx.h], [AC_CHECK_HEADERS]) AN_HEADER([values.h], [AC_CHECK_HEADERS]) ## ------------------------------- ## ## 4. Tests for specific headers. ## ## ------------------------------- ## # AC_HEADER_ASSERT # ---------------- # Check whether to enable assertions. AC_DEFUN_ONCE([AC_HEADER_ASSERT], [ AC_MSG_CHECKING([whether to enable assertions]) AC_ARG_ENABLE([assert], [AS_HELP_STRING([--disable-assert], [turn off assertions])], [ac_enable_assert=$enableval AS_IF(dnl [test "x$enableval" = xno], [AC_DEFINE([NDEBUG], [1], [Define to 1 if assertions should be disabled.])], [test "x$enableval" != xyes], [AC_MSG_WARN([invalid argument supplied to --enable-assert]) ac_enable_assert=yes])], [ac_enable_assert=yes]) AC_MSG_RESULT([$ac_enable_assert]) ]) # _AC_CHECK_HEADER_DIRENT(HEADER-FILE, # [ACTION-IF-FOUND], [ACTION-IF-NOT_FOUND]) # ----------------------------------------------------------------- # Like AC_CHECK_HEADER, except also make sure that HEADER-FILE # defines the type `DIR'. dirent.h on NextStep 3.2 doesn't. m4_define([_AC_CHECK_HEADER_DIRENT], [AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_dirent_$1])dnl AC_CACHE_CHECK([for $1 that defines DIR], [ac_Header], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h> #include <$1> ], [if ((DIR *) 0) return 0;])], [AS_VAR_SET([ac_Header], [yes])], [AS_VAR_SET([ac_Header], [no])])]) AS_VAR_IF([ac_Header], [yes], [$2], [$3]) AS_VAR_POPDEF([ac_Header])dnl ])# _AC_CHECK_HEADER_DIRENT # _AH_CHECK_HEADER_DIRENT(HEADERS) # -------------------------------- # Like _AH_CHECK_HEADER, but tuned to a dirent provider. m4_define([_AH_CHECK_HEADER_DIRENT], [AH_TEMPLATE(AS_TR_CPP([HAVE_$1]), [Define to 1 if you have the <$1> header file, and it defines `DIR'.])]) # AC_HEADER_DIRENT # ---------------- AC_DEFUN([AC_HEADER_DIRENT], [m4_map_args([_AH_CHECK_HEADER_DIRENT], [dirent.h], [sys/ndir.h], [sys/dir.h], [ndir.h])]dnl [ac_header_dirent=no for ac_hdr in dirent.h sys/ndir.h sys/dir.h ndir.h; do _AC_CHECK_HEADER_DIRENT($ac_hdr, [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_$ac_hdr), 1) ac_header_dirent=$ac_hdr; break]) done # Two versions of opendir et al. are in -ldir and -lx on SCO Xenix. if test $ac_header_dirent = dirent.h; then AC_SEARCH_LIBS(opendir, dir) else AC_SEARCH_LIBS(opendir, x) fi ])# AC_HEADER_DIRENT # AC_HEADER_MAJOR # --------------- # Thanks to glibc 2.25 deprecating macros in sys/types.h, coupled with # back-compat to autoconf 2.69, we need the following logic: # Check whether <sys/types.h> compiles. # If <sys/mkdev.h> compiles, assume it provides major/minor/makedev. # Otherwise, if <sys/sysmacros.h> compiles, assume it provides the macros. # Otherwise, either the macros were provided by <sys/types.h>, or do # not exist on the platform. Code trying to use these three macros is # assumed to not care about platforms that lack the macros. AN_FUNCTION([major], [AC_HEADER_MAJOR]) AN_FUNCTION([makedev], [AC_HEADER_MAJOR]) AN_FUNCTION([minor], [AC_HEADER_MAJOR]) AN_HEADER([sys/mkdev.h], [AC_HEADER_MAJOR]) AC_DEFUN([AC_HEADER_MAJOR], [AC_CHECK_HEADERS_ONCE([sys/types.h]) AC_CHECK_HEADER([sys/mkdev.h], [AC_DEFINE([MAJOR_IN_MKDEV], [1], [Define to 1 if `major', `minor', and `makedev' are declared in <mkdev.h>.])]) if test $ac_cv_header_sys_mkdev_h = no; then AC_CHECK_HEADER([sys/sysmacros.h], [AC_DEFINE([MAJOR_IN_SYSMACROS], [1], [Define to 1 if `major', `minor', and `makedev' are declared in <sysmacros.h>.])]) fi ])# AC_HEADER_MAJOR # AC_HEADER_RESOLV # ---------------- # sys/types.h, netinet/in.h and arpa/nameser.h are required on IRIX. # netinet/in.h is needed on Cygwin, too. # With Solaris 9, netdb.h is required, to get symbols like HOST_NOT_FOUND. # AN_HEADER(resolv.h, [AC_HEADER_RESOLV]) AC_DEFUN([AC_HEADER_RESOLV], [AC_CHECK_HEADERS(sys/types.h netinet/in.h arpa/nameser.h netdb.h resolv.h, [], [], [[#ifdef HAVE_SYS_TYPES_H # include <sys/types.h> #endif #ifdef HAVE_NETINET_IN_H # include <netinet/in.h> /* inet_ functions / structs */ #endif #ifdef HAVE_ARPA_NAMESER_H # include <arpa/nameser.h> /* DNS HEADER struct */ #endif #ifdef HAVE_NETDB_H # include <netdb.h> #endif]]) ])# AC_HEADER_RESOLV # AC_HEADER_STAT # -------------- # FIXME: Shouldn't this be named AC_HEADER_SYS_STAT? AC_DEFUN([AC_HEADER_STAT], [AC_CACHE_CHECK(whether stat file-mode macros are broken, ac_cv_header_stat_broken, [AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/types.h> #include <sys/stat.h> #if defined S_ISBLK && defined S_IFDIR extern char c1[S_ISBLK (S_IFDIR) ? -1 : 1]; #endif #if defined S_ISBLK && defined S_IFCHR extern char c2[S_ISBLK (S_IFCHR) ? -1 : 1]; #endif #if defined S_ISLNK && defined S_IFREG extern char c3[S_ISLNK (S_IFREG) ? -1 : 1]; #endif #if defined S_ISSOCK && defined S_IFREG extern char c4[S_ISSOCK (S_IFREG) ? -1 : 1]; #endif ]])], ac_cv_header_stat_broken=no, ac_cv_header_stat_broken=yes)]) if test $ac_cv_header_stat_broken = yes; then AC_DEFINE(STAT_MACROS_BROKEN, 1, [Define to 1 if the `S_IS*' macros in <sys/stat.h> do not work properly.]) fi ])# AC_HEADER_STAT # AC_CHECK_HEADER_STDBOOL # ----------------- # Check for stdbool.h that conforms to C99. AN_IDENTIFIER([bool], [AC_CHECK_HEADER_STDBOOL]) AN_IDENTIFIER([true], [AC_CHECK_HEADER_STDBOOL]) AN_IDENTIFIER([false],[AC_CHECK_HEADER_STDBOOL]) AC_DEFUN([AC_CHECK_HEADER_STDBOOL], [AC_CHECK_TYPES([_Bool]) AC_CACHE_CHECK([for stdbool.h that conforms to C99], [ac_cv_header_stdbool_h], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include <stdbool.h> #ifndef __bool_true_false_are_defined #error "__bool_true_false_are_defined is not defined" #endif char a[__bool_true_false_are_defined == 1 ? 1 : -1]; /* Regardless of whether this is C++ or "_Bool" is a valid type name, "true" and "false" should be usable in #if expressions and integer constant expressions, and "bool" should be a valid type name. */ #if !true #error "'true' is not true" #endif #if true != 1 #error "'true' is not equal to 1" #endif char b[true == 1 ? 1 : -1]; char c[true]; #if false #error "'false' is not false" #endif #if false != 0 #error "'false' is not equal to 0" #endif char d[false == 0 ? 1 : -1]; enum { e = false, f = true, g = false * true, h = true * 256 }; char i[(bool) 0.5 == true ? 1 : -1]; char j[(bool) 0.0 == false ? 1 : -1]; char k[sizeof (bool) > 0 ? 1 : -1]; struct sb { bool s: 1; bool t; } s; char l[sizeof s.t > 0 ? 1 : -1]; /* The following fails for HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ bool m[h]; char n[sizeof m == h * sizeof m[0] ? 1 : -1]; char o[-1 - (bool) 0 < 0 ? 1 : -1]; /* Catch a bug in an HP-UX C compiler. See https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html https://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html */ bool p = true; bool *pp = &p; /* C 1999 specifies that bool, true, and false are to be macros, but C++ 2011 and later overrule this. */ #if __cplusplus < 201103 #ifndef bool #error "bool is not defined" #endif #ifndef false #error "false is not defined" #endif #ifndef true #error "true is not defined" #endif #endif /* If _Bool is available, repeat with it all the tests above that used bool. */ #ifdef HAVE__BOOL struct sB { _Bool s: 1; _Bool t; } t; char q[(_Bool) 0.5 == true ? 1 : -1]; char r[(_Bool) 0.0 == false ? 1 : -1]; char u[sizeof (_Bool) > 0 ? 1 : -1]; char v[sizeof t.t > 0 ? 1 : -1]; _Bool w[h]; char x[sizeof m == h * sizeof m[0] ? 1 : -1]; char y[-1 - (_Bool) 0 < 0 ? 1 : -1]; _Bool z = true; _Bool *pz = &p; #endif ]], [[ bool ps = &s; *pp |= p; *pp |= ! p; #ifdef HAVE__BOOL _Bool pt = &t; *pz |= z; *pz |= ! z; #endif /* Refer to every declared value, so they cannot be discarded as unused. */ return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l + !m + !n + !o + !p + !pp + !ps #ifdef HAVE__BOOL + !q + !r + !u + !v + !w + !x + !y + !z + !pt #endif ); ]])], [ac_cv_header_stdbool_h=yes], [ac_cv_header_stdbool_h=no])]) ])# AC_CHECK_HEADER_STDBOOL # AC_HEADER_STDBOOL # ----------------- # Define HAVE_STDBOOL_H if the system provides stdbool.h that conforms to C99. AC_DEFUN([AC_HEADER_STDBOOL], [AC_CHECK_HEADER_STDBOOL if test $ac_cv_header_stdbool_h = yes; then AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.]) fi ])# AC_HEADER_STDBOOL # AU::AC_HEADER_STDC # ------------------ AU_DEFUN([AC_HEADER_STDC], [# Autoupdate added the next two lines to ensure that your configure # script's behavior did not change. They are probably safe to remove. AC_CHECK_INCLUDES_DEFAULT AC_PROG_EGREP ], [The preprocessor macro `STDC_HEADERS' is obsolete. Except in unusual embedded environments, you can safely include all ISO C90 headers unconditionally.]) # AC_HEADER_SYS_WAIT # ------------------ AC_DEFUN([AC_HEADER_SYS_WAIT], [AC_CACHE_CHECK([for sys/wait.h that is POSIX.1 compatible], ac_cv_header_sys_wait_h, [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([#include <sys/types.h> #include <sys/wait.h> #ifndef WEXITSTATUS # define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8) #endif #ifndef WIFEXITED # define WIFEXITED(stat_val) (((stat_val) & 255) == 0) #endif ], [ int s; wait (&s); s = WIFEXITED (s) ? WEXITSTATUS (s) : 1;])], [ac_cv_header_sys_wait_h=yes], [ac_cv_header_sys_wait_h=no])]) if test $ac_cv_header_sys_wait_h = yes; then AC_DEFINE(HAVE_SYS_WAIT_H, 1, [Define to 1 if you have <sys/wait.h> that is POSIX.1 compatible.]) fi ])# AC_HEADER_SYS_WAIT # AU::AC_HEADER_TIME # ------------------ AU_DEFUN([AC_HEADER_TIME], [AC_CHECK_HEADERS_ONCE([sys/time.h]) # Obsolete code to be removed. if test $ac_cv_header_sys_time_h = yes; then AC_DEFINE(TIME_WITH_SYS_TIME, 1, [Define to 1 if you can safely include both <sys/time.h> and <time.h>. This macro is obsolete.]) fi # End of obsolete code. ], [Update your code to rely only on HAVE_SYS_TIME_H, then remove this warning and the obsolete code below it. All current systems provide time.h; it need not be checked for. Not all systems provide sys/time.h, but those that do, all allow you to include it and time.h simultaneously.]) # AC_HEADER_TIME # _AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H # ---------------------------------- m4_define([_AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H], [AC_CACHE_CHECK([whether termios.h defines TIOCGWINSZ], ac_cv_sys_tiocgwinsz_in_termios_h, [AC_EGREP_CPP([yes], [#include <sys/types.h> #include <termios.h> #ifdef TIOCGWINSZ yes #endif ], ac_cv_sys_tiocgwinsz_in_termios_h=yes, ac_cv_sys_tiocgwinsz_in_termios_h=no)]) ])# _AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H # _AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL # ---------------------------------- m4_define([_AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL], [AC_CACHE_CHECK([whether sys/ioctl.h defines TIOCGWINSZ], ac_cv_sys_tiocgwinsz_in_sys_ioctl_h, [AC_EGREP_CPP([yes], [#include <sys/types.h> #include <sys/ioctl.h> #ifdef TIOCGWINSZ yes #endif ], ac_cv_sys_tiocgwinsz_in_sys_ioctl_h=yes, ac_cv_sys_tiocgwinsz_in_sys_ioctl_h=no)]) ])# _AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL # AC_HEADER_TIOCGWINSZ # -------------------- # Look for a header that defines TIOCGWINSZ. # FIXME: Is this the proper name? Is this the proper implementation? # I need more help. AC_DEFUN([AC_HEADER_TIOCGWINSZ], [_AC_HEADER_TIOCGWINSZ_IN_TERMIOS_H if test $ac_cv_sys_tiocgwinsz_in_termios_h != yes; then _AC_HEADER_TIOCGWINSZ_IN_SYS_IOCTL if test $ac_cv_sys_tiocgwinsz_in_sys_ioctl_h = yes; then AC_DEFINE(GWINSZ_IN_SYS_IOCTL,1, [Define to 1 if `TIOCGWINSZ' requires <sys/ioctl.h>.]) fi fi ])# AC_HEADER_TIOCGWINSZ # AU::AC_UNISTD_H # --------------- AU_DEFUN([AC_UNISTD_H], [# Autoupdate added the following line to ensure that your configure # script's behavior did not change. It is probably safe to remove. AC_CHECK_INCLUDES_DEFAULT]) # AU::AC_USG # ---------- # Define `USG' if string functions are *not* in strings.h. AU_DEFUN([AC_USG], [# Obsolete code to be removed. AC_MSG_CHECKING([for BSD string and memory functions]) AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <strings.h>]], [[rindex("", 0); bzero(0, 0);]])], [AC_MSG_RESULT(yes)], [AC_MSG_RESULT(no) AC_DEFINE(USG, 1, [Define to 1 if you do not have <strings.h>, index, bzero, etc... This symbol is obsolete, you should not depend upon it.])]) # End of obsolete code. ], [Update your code to use string.h, then remove this warning and the code below it. It is not necessary to check for string.h.]) # AU::AC_MEMORY_H # --------------- # To be precise this macro used to be: # # | AC_MSG_CHECKING(whether string.h declares mem functions) # | AC_EGREP_HEADER(memchr, string.h, ac_found=yes, ac_found=no) # | AC_MSG_RESULT($ac_found) # | if test $ac_found = no; then # | AC_CHECK_HEADER(memory.h, [AC_DEFINE(NEED_MEMORY_H)]) # | fi # # But it is better to check for both headers, and alias NEED_MEMORY_H to # HAVE_MEMORY_H. AU_DEFUN([AC_MEMORY_H], [# Obsolete code to be removed. AC_CHECK_HEADERS_ONCE([memory.h]) if test $ac_cv_header_memory_h = yes; then AC_DEFINE([NEED_MEMORY_H], [1], [Same as `HAVE_MEMORY_H', don't depend on me.]) fi # End of obsolete code. ], [Update your code to use string.h, then remove this warning and the code below it. It is not necessary to check for string.h.]) # AU::AC_DIR_HEADER # ----------------- # Like calling `AC_HEADER_DIRENT' and `AC_FUNC_CLOSEDIR_VOID', but # defines a different set of C preprocessor macros to indicate which # header file is found. AU_DEFUN([AC_DIR_HEADER], [AC_HEADER_DIRENT AC_FUNC_CLOSEDIR_VOID test ac_cv_header_dirent_dirent_h && AC_DEFINE([DIRENT], 1, [Same as `HAVE_DIRENT_H', don't depend on me.]) test ac_cv_header_dirent_sys_ndir_h && AC_DEFINE([SYSNDIR], 1, [Same as `HAVE_SYS_NDIR_H', don't depend on me.]) test ac_cv_header_dirent_sys_dir_h && AC_DEFINE([SYSDIR], 1, [Same as `HAVE_SYS_DIR_H', don't depend on me.]) test ac_cv_header_dirent_ndir_h && AC_DEFINE([NDIR], 1, [Same as `HAVE_NDIR_H', don't depend on me.])], [Remove this warning and the four `AC_DEFINE' when you adjust your code to use `AC_HEADER_DIRENT'.])