(_AC_FUNC_VFORK): this.
Remove AC_DEFINEs and don't guess cross-compilation values.
(_AC_FUNC_FORK): New, check whether fork() isn't just a stub.
(AC_FUNC_FORK): New, use _AC_FUNC_VFORK and _AC_FUNC_FORK to
define HAVE_WORKING_FORK, HAVE_WORKING_VFORK; and vfork to fork if
vfork doesn't work.
Guess values if cross-compiling, but warn.
* acfunctions: Add AC_FUNC_FORK.
* doc/autoconf.texi: Document AC_FUNC_FORK. Give example to define
and vfork appropriately.
+2001-06-18 Rüdiger Kuhlmann <autoconf-list-xf3QB=cvz1AP@ruediger-kuhlmann.de>
+
+ * acfunctions.m4: (AC_FUNC_VFORK) rename as...
+ (_AC_FUNC_VFORK): this.
+ Remove AC_DEFINEs and don't guess cross-compilation values.
+ (_AC_FUNC_FORK): New, check whether fork() isn't just a stub.
+ (AC_FUNC_FORK): New, use _AC_FUNC_VFORK and _AC_FUNC_FORK to
+ define HAVE_WORKING_FORK, HAVE_WORKING_VFORK; and vfork to fork if
+ vfork doesn't work.
+ Guess values if cross-compiling, but warn.
+ * acfunctions: Add AC_FUNC_FORK.
+ * doc/autoconf.texi: Document AC_FUNC_FORK. Give example to define
+ and vfork appropriately.
+
2001-06-18 Akim Demaille <akim@epita.fr>
* doc/autoconf.texi (Functions Portability): New section.
Robert Lipe robertlipe@usa.net
Robert S. Maier rsm@math.arizona.edu
Roland McGrath roland@gnu.org
+Rüdiger Kuhlmann autoconf-list-xf3QB=cvz1AP@ruediger-kuhlmann.de
Ruediger Kuhlmann uck4@rz.uni-karlsruhe.de
Russ Allbery rra@stanford.edu
Ryuji Abe raeva@t3.rim.or.jp
error AC_FUNC_ERROR_AT_LINE
error_at_line AC_FUNC_ERROR_AT_LINE
fnmatch AC_FUNC_FNMATCH
+fork AC_FUNC_FORK
fseeko AC_FUNC_FSEEKO
ftello AC_FUNC_FSEEKO
getgroups AC_FUNC_GETGROUPS
strftime AC_FUNC_STRFTIME
strtod AC_FUNC_STRTOD
utime AC_FUNC_UTIME_NULL
-vfork AC_FUNC_VFORK
+vfork AC_FUNC_FORK
vfprintf AC_FUNC_VPRINTF
vprintf AC_FUNC_VPRINTF
vsprintf AC_FUNC_VPRINTF
AU_ALIAS([AC_UTIME_NULL], [AC_FUNC_UTIME_NULL])
-# AC_FUNC_VFORK
+# AC_FUNC_FORK
# -------------
-AC_DEFUN([AC_FUNC_VFORK],
-[AC_REQUIRE([AC_TYPE_PID_T])dnl
-AC_CHECK_HEADERS(unistd.h vfork.h)
-AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
+AC_DEFUN([AC_FUNC_FORK],
+ [AC_REQUIRE([AC_TYPE_PID_T])dnl
+ AC_CHECK_HEADERS(unistd.h vfork.h)
+ AC_CHECK_FUNCS(fork vfork)
+ ac_cv_func_fork_works=$ac_cv_func_fork
+ if test "x$ac_cv_func_fork" = xyes; then
+ _AC_FUNC_FORK
+ fi
+ if test "x$ac_cv_func_fork_works" = xcross"; then
+ case "$host" in
+ *-*-amigaos* | *-*-msdosdjgpp*)
+ # Override, as these systems have only a dummy fork() stub
+ ac_cv_func_fork_works=no
+ ;;
+ *)
+ ac_cv_func_fork_works=yes
+ ;;
+ esac
+ AC_MSG_WARN(CROSS: Result $ac_cv_func_fork_works guessed due to cross-compiling.)
+ fi
+ ac_cv_func_vfork_works=$ac_cv_func_vfork
+ if test "x$ac_cv_func_vfork" = xyes; then
+ _AC_FUNC_VFORK
+ fi;
+ if test "x$ac_cv_func_fork_works" = xcross"; then
+ ac_cv_func_vfork_works=ac_cv_func_vfork
+ AC_MSG_WARN(CROSS: Result $ac_cv_func_vfork_works guessed due to cross-compiling.)
+ fi
+
+ if test "x$ac_cv_func_vfork_works" = xyes; then
+ AC_DEFINE(HAVE_WORKING_VFORK, 1, [Define if `vfork' works.])
+ else
+ AC_DEFINE(vfork, fork, [Define as `fork' if `vfork' does not work.])
+ fi
+ if test "x$ac_cv_func_fork_works" = xyes; then
+ AC_DEFINE(HAVE_WORKING_FORK, 1, [Define if `fork' works.])
+ endif
+])# AC_FUNC_FORK
+
+
+# _AC_FUNC_FORK
+# -------------
+AC_DEFUN([_AC_FUNC_FORK],
+ [AC_CACHE_CHECK(for working fork, ac_cv_func_fork_works,
+ [AC_RUN_IFELSE([/* By Rüdiger Kuhlmann. */
+ #include <sys/types.h>
+ #if HAVE_UNISTD_H
+ # include <unistd.h>
+ #endif
+ /* Some systems only have a dummy stub for fork() */
+ int main ()
+ {
+ if (fork() < 0)
+ exit (1);
+ exit (0);
+ }],
+ [ac_cv_func_fork_works=yes],
+ [ac_cv_func_fork_works=no],
+ [ac_cv_func_fork_works=cross])])]
+)# _AC_FUNC_FORK
+
+
+# _AC_FUNC_VFORK
+# -------------
+AC_DEFUN([_AC_FUNC_VFORK],
+[AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
[AC_TRY_RUN([/* Thanks to Paul Eggert for this test. */
#include <stdio.h>
#include <sys/types.h>
}],
[ac_cv_func_vfork_works=yes],
[ac_cv_func_vfork_works=no],
- [AC_CHECK_FUNC(vfork)
-ac_cv_func_vfork_works=$ac_cv_func_vfork])])
-if test "x$ac_cv_func_vfork_works" = xno; then
- AC_DEFINE(vfork, fork, [Define as `fork' if `vfork' does not work.])
-fi
-])# AC_FUNC_VFORK
+ [ac_cv_func_vfork_works=cross])])
+])# _AC_FUNC_VFORK
+# AU::AC_FUNC_VFORK
+# ------------
+AU_ALIAS([AC_FUNC_VFORK], [AC_FUNC_FORK])
+
# AU::AC_VFORK
# ------------
-AU_ALIAS([AC_VFORK], [AC_FUNC_VFORK])
+AU_ALIAS([AC_VFORK], [AC_FUNC_FORK])
# AC_FUNC_VPRINTF
Solaris 2.4), define @code{HAVE_FNMATCH}.
@end defmac
+@defmac AC_FUNC_FORK
+@maindex FUNC_FORK
+@cvindex HAVE_VFORK_H
+@cvindex HAVE_WORKING_FORK
+@cvindex HAVE_WORKING_VFORK
+@cvindex vfork
+This macro checks for the @code{fork} and @code{vfork} functions. If a
+working @code{fork} is found, define @code{HAVE_WORKING_FORK}. This macro
+checks whether @code{fork} is just a stub by trying to run it.
+
+If @file{vfork.h} is found, define @code{HAVE_VFORK_H}. If a working
+@code{vfork} is found, define @code{HAVE_WORKING_VFORK}. Otherwise,
+define @code{vfork} to be @code{fork} for backward compatibility with
+previous versions of @command{autoconf}. This macro checks for several known
+errors in implementations of @code{vfork} and considers the system to not
+have a working @code{vfork} if it detects any of them. It is not considered
+to be an implementation error if a child's invocation of @code{signal}
+modifies the parent's signal handler, since child processes rarely change
+their signal handlers.
+
+Since this macro defines @code{vfork} only for backward compatibility with
+previous versions of @command{autoconf} you're encouraged to define it
+yourself in new code:
+@example
+@group
+#if !HAVE_WORKING_VFORK
+# define vfork fork
+#endif
+@end group
+@end example
+@end defmac
+
@defmac AC_FUNC_FSEEKO
@maindex FUNC_FSEEKO
@cvindex _LARGEFILE_SOURCE
the present, define @code{HAVE_UTIME_NULL}.
@end defmac
-@defmac AC_FUNC_VFORK
-@maindex FUNC_VFORK
-@cvindex HAVE_VFORK_H
-@cvindex vfork
-If @file{vfork.h} is found, define @code{HAVE_VFORK_H}. If a working
-@code{vfork} is not found, define @code{vfork} to be @code{fork}. This
-macro checks for several known errors in implementations of @code{vfork}
-and considers the system to not have a working @code{vfork} if it
-detects any of them. It is not considered to be an implementation error
-if a child's invocation of @code{signal} modifies the parent's signal
-handler, since child processes rarely change their signal handlers.
-@end defmac
-
@defmac AC_FUNC_VPRINTF
@maindex FUNC_VPRINTF
@cvindex HAVE_VPRINTF
AU_ALIAS([AC_UTIME_NULL], [AC_FUNC_UTIME_NULL])
-# AC_FUNC_VFORK
+# AC_FUNC_FORK
# -------------
-AC_DEFUN([AC_FUNC_VFORK],
-[AC_REQUIRE([AC_TYPE_PID_T])dnl
-AC_CHECK_HEADERS(unistd.h vfork.h)
-AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
+AC_DEFUN([AC_FUNC_FORK],
+ [AC_REQUIRE([AC_TYPE_PID_T])dnl
+ AC_CHECK_HEADERS(unistd.h vfork.h)
+ AC_CHECK_FUNCS(fork vfork)
+ ac_cv_func_fork_works=$ac_cv_func_fork
+ if test "x$ac_cv_func_fork" = xyes; then
+ _AC_FUNC_FORK
+ fi
+ if test "x$ac_cv_func_fork_works" = xcross"; then
+ case "$host" in
+ *-*-amigaos* | *-*-msdosdjgpp*)
+ # Override, as these systems have only a dummy fork() stub
+ ac_cv_func_fork_works=no
+ ;;
+ *)
+ ac_cv_func_fork_works=yes
+ ;;
+ esac
+ AC_MSG_WARN(CROSS: Result $ac_cv_func_fork_works guessed due to cross-compiling.)
+ fi
+ ac_cv_func_vfork_works=$ac_cv_func_vfork
+ if test "x$ac_cv_func_vfork" = xyes; then
+ _AC_FUNC_VFORK
+ fi;
+ if test "x$ac_cv_func_fork_works" = xcross"; then
+ ac_cv_func_vfork_works=ac_cv_func_vfork
+ AC_MSG_WARN(CROSS: Result $ac_cv_func_vfork_works guessed due to cross-compiling.)
+ fi
+
+ if test "x$ac_cv_func_vfork_works" = xyes; then
+ AC_DEFINE(HAVE_WORKING_VFORK, 1, [Define if `vfork' works.])
+ else
+ AC_DEFINE(vfork, fork, [Define as `fork' if `vfork' does not work.])
+ fi
+ if test "x$ac_cv_func_fork_works" = xyes; then
+ AC_DEFINE(HAVE_WORKING_FORK, 1, [Define if `fork' works.])
+ endif
+])# AC_FUNC_FORK
+
+
+# _AC_FUNC_FORK
+# -------------
+AC_DEFUN([_AC_FUNC_FORK],
+ [AC_CACHE_CHECK(for working fork, ac_cv_func_fork_works,
+ [AC_RUN_IFELSE([/* By Rüdiger Kuhlmann. */
+ #include <sys/types.h>
+ #if HAVE_UNISTD_H
+ # include <unistd.h>
+ #endif
+ /* Some systems only have a dummy stub for fork() */
+ int main ()
+ {
+ if (fork() < 0)
+ exit (1);
+ exit (0);
+ }],
+ [ac_cv_func_fork_works=yes],
+ [ac_cv_func_fork_works=no],
+ [ac_cv_func_fork_works=cross])])]
+)# _AC_FUNC_FORK
+
+
+# _AC_FUNC_VFORK
+# -------------
+AC_DEFUN([_AC_FUNC_VFORK],
+[AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
[AC_TRY_RUN([/* Thanks to Paul Eggert for this test. */
#include <stdio.h>
#include <sys/types.h>
}],
[ac_cv_func_vfork_works=yes],
[ac_cv_func_vfork_works=no],
- [AC_CHECK_FUNC(vfork)
-ac_cv_func_vfork_works=$ac_cv_func_vfork])])
-if test "x$ac_cv_func_vfork_works" = xno; then
- AC_DEFINE(vfork, fork, [Define as `fork' if `vfork' does not work.])
-fi
-])# AC_FUNC_VFORK
+ [ac_cv_func_vfork_works=cross])])
+])# _AC_FUNC_VFORK
+# AU::AC_FUNC_VFORK
+# ------------
+AU_ALIAS([AC_FUNC_VFORK], [AC_FUNC_FORK])
+
# AU::AC_VFORK
# ------------
-AU_ALIAS([AC_VFORK], [AC_FUNC_VFORK])
+AU_ALIAS([AC_VFORK], [AC_FUNC_FORK])
# AC_FUNC_VPRINTF
error AC_FUNC_ERROR_AT_LINE
error_at_line AC_FUNC_ERROR_AT_LINE
fnmatch AC_FUNC_FNMATCH
+fork AC_FUNC_FORK
fseeko AC_FUNC_FSEEKO
ftello AC_FUNC_FSEEKO
getgroups AC_FUNC_GETGROUPS
strftime AC_FUNC_STRFTIME
strtod AC_FUNC_STRTOD
utime AC_FUNC_UTIME_NULL
-vfork AC_FUNC_VFORK
+vfork AC_FUNC_FORK
vfprintf AC_FUNC_VPRINTF
vprintf AC_FUNC_VPRINTF
vsprintf AC_FUNC_VPRINTF
AT_CHECK_MACRO([AC_FUNC_CLOSEDIR_VOID])
AT_CHECK_MACRO([AC_FUNC_ERROR_AT_LINE])
AT_CHECK_MACRO([AC_FUNC_FNMATCH])
+AT_CHECK_MACRO([AC_FUNC_FORK])
AT_CHECK_MACRO([AC_FUNC_FSEEKO])
AT_CHECK_MACRO([AC_FUNC_GETGROUPS])
AT_CHECK_MACRO([AC_FUNC_GETLOADAVG])
AT_CHECK_MACRO([AC_FUNC_STRFTIME])
AT_CHECK_MACRO([AC_FUNC_STRTOD])
AT_CHECK_MACRO([AC_FUNC_UTIME_NULL])
-AT_CHECK_MACRO([AC_FUNC_VFORK])
AT_CHECK_MACRO([AC_FUNC_VPRINTF])
AT_CHECK_MACRO([AC_FUNC_WAIT3])
projects / thirdparty / autoconf.git / commitdiff
