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configure.ac: auto-disable MITSHM if we lack IPC

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The MITSHM extension uses SYSV IPC, but even if configure's test
for IPC failed, MITSHM was still enabled by default, breaking
MinGW builds by default.

Unfortunately, fixing this exposes the fact that the HAVE_SYSV_IPC
test wasn't being used for anything before and so we hadn't noticed it
was failing on Cygwin.

Change from using SHM_W|SHM_R flags (which aren't required by POSIX) to
S_IRUSR|S_IWUSR flags (which are)

Signed-off-by: Ryan Pavlik <rpavlik@iastate.edu>
Reviewed-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
This commit is contained in:
Ryan Pavlik 2011-11-04 13:30:43 -05:00 committed by Jon TURNEY
parent 0426e6d65b
commit 2225208c2e
1 changed files with 6 additions and 2 deletions
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8
configure.ac
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@ -271,10 +271,11 @@ AC_CACHE_CHECK([for SYSV IPC],
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
],[
{
int id;
id = shmget(IPC_PRIVATE, 512, SHM_W | SHM_R);
id = shmget(IPC_PRIVATE, 512, S_IRUSR | S_IWUSR);
if (id < 0) return -1;
return shmctl(id, IPC_RMID, 0);
}],
@ -592,7 +593,7 @@ AC_ARG_WITH(khronos-spec-dir, AS_HELP_STRING([--with-khronos-spec-dir=PATH], [Pa
dnl Extensions.
AC_ARG_ENABLE(registry, AS_HELP_STRING([--disable-registry], [Build string registry module (default: enabled)]), [XREGISTRY=$enableval], [XREGISTRY=yes])
AC_ARG_ENABLE(composite, AS_HELP_STRING([--disable-composite], [Build Composite extension (default: enabled)]), [COMPOSITE=$enableval], [COMPOSITE=yes])
AC_ARG_ENABLE(mitshm, AS_HELP_STRING([--disable-mitshm], [Build SHM extension (default: enabled)]), [MITSHM=$enableval], [MITSHM=yes])
AC_ARG_ENABLE(mitshm, AS_HELP_STRING([--disable-mitshm], [Build SHM extension (default: auto)]), [MITSHM=$enableval], [MITSHM=auto])
AC_ARG_ENABLE(xres, AS_HELP_STRING([--disable-xres], [Build XRes extension (default: enabled)]), [RES=$enableval], [RES=yes])
AC_ARG_ENABLE(record, AS_HELP_STRING([--disable-record], [Build Record extension (default: enabled)]), [RECORD=$enableval], [RECORD=yes])
AC_ARG_ENABLE(xv, AS_HELP_STRING([--disable-xv], [Build Xv extension (default: enabled)]), [XV=$enableval], [XV=yes])
@ -1000,6 +1001,9 @@ if test "x$COMPOSITE" = xyes; then
COMPOSITE_INC='-I$(top_srcdir)/composite'
fi
if test "x$MITSHM" = xauto; then
MITSHM="$ac_cv_sysv_ipc"
fi
AM_CONDITIONAL(MITSHM, [test "x$MITSHM" = xyes])
if test "x$MITSHM" = xyes; then
AC_DEFINE(MITSHM, 1, [Support MIT-SHM extension])