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https://gitlab.rtems.org/rtems/rtos/rtems.git
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ea562ee977
After upgrading my linux box to the brand new SuSE 6.2 release, which is
glibc-2.1 based, I came across a bug in RTEMS - IIRC, I even warned you
about it about 1/2 a year ago, but nothing has been done since then :-.
The *.m4 macros to check for SYSV/IPC are broken for linux/glibc2.1,
because they assume that linux always defines union semun, which isn't
true anymore for glibc2.1 (the manpage for semctl states _X_OPEN
specifies it this way). Therefore I have tried to implement a more
general approach for handling SYSV for unix/posix which checks for
presence of struct semun, instead of trying to evaluate OS specific
preprocessor symbols.
This approach is a bit adventureous, because I only tested it with
linux/glibc2.1 and linux/libc5, but not under other Unix variants RTEMS
supports. I am quite confident it will work on other hosts, too, but who
knows :-.
[FYI: I think this might also is the cause of some problems with RedHat
6.X / Mandrake linux recently reported on the rtems list -- rtems-4.0.0
can not be build for posix on any glibc2.1 based host]
Furthermore the patch below contains a couple of minor fixes and
configuration cleanups, which IMO should be applied before releasing a
new snapshot.
To apply this patch:
cd <source-tree>
patch -p1 < rtems-rc-19990709-8.diff
./autogen
134 lines
3.2 KiB
Plaintext
134 lines
3.2 KiB
Plaintext
dnl
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dnl $Id$
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dnl
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dnl Check for System V IPC calls used by Unix simulators
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dnl
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dnl 98/07/17 Dario Alcocer alcocer@netcom.com
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dnl Ralf Corsepius corsepiu@faw.uni-ulm.de
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dnl
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dnl Note: $host_os should probably *not* ever be used here to
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dnl determine if host supports System V IPC calls, since some
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dnl (e.g. FreeBSD 2.x) are configured by default to include only
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dnl a subset of the System V IPC calls. Therefore, to make sure
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dnl all of the required calls are found, test for each call explicitly.
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dnl
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dnl All of the calls use IPC_PRIVATE, so tests will not unintentionally
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dnl modify any existing key sets. See the man pages for semget, shmget,
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dnl msgget, semctl, shmctl and msgctl for details.
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AC_DEFUN(RTEMS_UNION_SEMUN,
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[
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AC_CACHE_CHECK([whether $RTEMS_HOST defines union semun],
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rtems_cv_HAS_UNION_SEMUN,
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[AC_TRY_COMPILE([
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/sem.h>],
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[union semun arg ;],
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[rtems_cv_HAS_UNION_SEMUN="yes"],
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[rtems_cv_HAS_UNION_SEMUN="no"])
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if test "$rtems_cv_HAS_UNION_SEMUN" = "yes"; then
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AC_DEFINE(HAS_UNION_SEMUN)
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fi])
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])
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AC_DEFUN(RTEMS_SYSV_SEM,
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([RTEMS_CANONICAL_HOST])
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AC_CACHE_CHECK(whether $RTEMS_HOST supports System V semaphores,
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rtems_cv_sysv_sem,
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[
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AC_TRY_RUN(
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[
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/sem.h>
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#if !HAS_UNION_SEMUN
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union semun {
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int val;
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struct semid_ds *buf;
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ushort *array;
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} ;
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#endif
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int main () {
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union semun arg ;
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int id=semget(IPC_PRIVATE,1,IPC_CREAT|0400);
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if (id == -1)
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exit(1);
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arg.val = 0; /* avoid implicit type cast to union */
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if (semctl(id, 0, IPC_RMID, arg) == -1)
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exit(1);
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exit(0);
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}
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],
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rtems_cv_sysv_sem="yes", rtems_cv_sysv_sem="no", :)
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])
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])
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AC_DEFUN(RTEMS_SYSV_SHM,
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([RTEMS_CANONICAL_HOST])
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AC_CACHE_CHECK(whether $RTEMS_HOST supports System V shared memory,
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rtems_cv_sysv_shm,
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[
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AC_TRY_RUN([
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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int main () {
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int id=shmget(IPC_PRIVATE,1,IPC_CREAT|0400);
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if (id == -1)
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exit(1);
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if (shmctl(id, IPC_RMID, 0) == -1)
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exit(1);
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exit(0);
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}
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],
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rtems_cv_sysv_shm="yes", rtems_cv_sysv_shm="no", :)
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])
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])
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AC_DEFUN(RTEMS_SYSV_MSG,
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([RTEMS_CANONICAL_HOST])
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AC_CACHE_CHECK(whether $RTEMS_HOST supports System V messages,
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rtems_cv_sysv_msg,
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[
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AC_TRY_RUN([
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/msg.h>
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int main () {
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int id=msgget(IPC_PRIVATE,IPC_CREAT|0400);
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if (id == -1)
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exit(1);
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if (msgctl(id, IPC_RMID, 0) == -1)
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exit(1);
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exit(0);
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}
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],
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rtems_cv_sysv_msg="yes", rtems_cv_sysv_msg="no", :)
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])
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])
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AC_DEFUN(RTEMS_CHECK_SYSV_UNIX,
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[AC_REQUIRE([RTEMS_CANONICAL_HOST])
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if test "$RTEMS_CPU" = "unix" ; then
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RTEMS_UNION_SEMUN
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RTEMS_SYSV_SEM
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if test "$rtems_cv_sysv_sem" != "yes" ; then
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AC_MSG_ERROR([System V semaphores don't work, required by simulator])
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fi
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RTEMS_SYSV_SHM
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if test "$rtems_cv_sysv_shm" != "yes" ; then
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AC_MSG_ERROR([System V shared memory doesn't work, required by simulator])
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fi
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RTEMS_SYSV_MSG
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if test "$rtems_cv_sysv_msg" != "yes" ; then
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AC_MSG_ERROR([System V messages don't work, required by simulator])
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fi
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fi
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])
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