2006-06-24 Zoltan Varga <vargaz@gmail.com>
[mono.git] / configure.in
index e7675d47482290128a8f8305ffdb68524132cd3f..b1b3b4b9fb504e7d524c6353ae1d89fce4114056 100644 (file)
@@ -6,7 +6,7 @@ AC_CANONICAL_SYSTEM
 m4_ifdef([_A][M_PROG_TAR],[_A][M_SET_OPTION([tar-ustar])])
 
 AM_CONFIG_HEADER(config.h)
-AM_INIT_AUTOMAKE(mono,1.1.5)
+AM_INIT_AUTOMAKE(mono,1.1.15)
 AM_MAINTAINER_MODE
 
 AC_PROG_LN_S
@@ -25,6 +25,7 @@ dnl
 gc_headers=no
 gc=included
 use_included_gc=no
+libgc_configure_args=
 
 if test -d $srcdir/libgc ; then
   gc_default=included
@@ -41,6 +42,11 @@ libmono_ldflags=""
 AC_SUBST(libmono_cflags)
 AC_SUBST(libmono_ldflags)
 
+# Variable to have relocatable .pc files (lib, or lib64)
+reloc_libdir=`basename ${libdir}`
+AC_SUBST(reloc_libdir)
+
+
 dnl if linker handles the version script
 no_version_script=no
 
@@ -54,25 +60,28 @@ case "$host" in
        *-*-mingw*|*-*-cygwin*)
                platform_win32=yes
                AC_DEFINE(PLATFORM_WIN32,1,[Platform is Win32])
-               CC="gcc -mno-cygwin -g"
+               if test "x$cross_compiling" = "xno"; then
+                       CC="gcc -mno-cygwin -g"
+                       # So libgc configure gets -mno-cygwin
+                       export CC
+               fi
                HOST_CC="gcc"
-               # So libgc configure gets -mno-cygwin
-               export CC
-# latest libgc already defines GC_WIN32_THREADS
-#              CPPFLAGS="$CPPFLAGS -DGC_WIN32_THREADS -DWIN32_THREADS"
-               CPPFLAGS="$CPPFLAGS -DWIN32_THREADS"
+               CPPFLAGS="$CPPFLAGS -DWIN32_THREADS -DFD_SETSIZE=1024"
                libdl=
                libgc_threads=win32
                gc_default=included
                with_nptl=default
                with_sigaltstack=no
                LN_S=cp
+               # This forces libgc to use the DllMain based thread registration code on win32
+               libgc_configure_args="$libgc_configure_args --enable-win32-dllmain=yes"
                ;;
        *-*-*netbsd*)
                platform_win32=no
                CPPFLAGS="$CPPFLAGS -D_REENTRANT"
                libmono_cflags="-D_REENTRANT"
                LDFLAGS="$LDFLAGS -pthread"
+               CPPFLAGS="$CPPFLAGS -DPLATFORM_BSD"
                libmono_ldflags="-pthread"
                need_link_unlink=yes
                libdl=
@@ -96,17 +105,15 @@ case "$host" in
                        LDFLAGS="$LDFLAGS $PTHREAD_LIBS"
                        libmono_ldflags="$PTHREAD_LIBS"
                fi
+               CPPFLAGS="$CPPFLAGS -DPLATFORM_BSD -DPLATFORM_BSD4"
                need_link_unlink=yes
                AC_DEFINE(PTHREAD_POINTER_ID)
                libdl=
                libgc_threads=pthreads
-# TLS isn't implemented at all on -STABLE
+# TLS isn't implemented at all on 4-STABLE
                with_nptl=no
                with_tls=pthread
                ;;
-# older versions of -CURRENT will break with these flags but testing
-# indicates these older versions won't run Mono anyway
-#
        *-*-*freebsd5*)
                platform_win32=no
                if test "x$PTHREAD_CFLAGS" = "x"; then
@@ -117,20 +124,48 @@ case "$host" in
                        libmono_cflags="$PTHREAD_CFLAGS"
                fi
                if test "x$PTHREAD_LIBS" = "x"; then
-                       LDFLAGS="$LDFLAGS -lpthread"
-                       libmono_ldflags="-lpthread"
+                       LDFLAGS="$LDFLAGS -pthread"
+                       libmono_ldflags="-pthread"
+               else
+                       LDFLAGS="$LDFLAGS $PTHREAD_LIBS"
+                       libmono_ldflags="$PTHREAD_LIBS"
+               fi
+               CPPFLAGS="$CPPFLAGS -DPLATFORM_BSD -DPLATFORM_BSD5"
+               need_link_unlink=yes
+               AC_DEFINE(PTHREAD_POINTER_ID)
+               libdl=
+               with_sigaltstack=yes
+               libgc_threads=pthreads
+# TLS is only partially implemented on 5-STABLE (compiler support
+# but NOT library support)
+#
+               with_tls=pthread
+               ;;
+       *-*-*freebsd6*)
+               platform_win32=no
+               if test "x$PTHREAD_CFLAGS" = "x"; then
+                       CPPFLAGS="$CPPFLAGS -DGC_FREEBSD_THREADS"
+                       libmono_cflags=
+               else
+                       CPPFLAGS="$CPPFLAGS $PTHREAD_CFLAGS -DGC_FREEBSD_THREADS"
+                       libmono_cflags="$PTHREAD_CFLAGS"
+               fi
+               if test "x$PTHREAD_LIBS" = "x"; then
+                       LDFLAGS="$LDFLAGS -pthread"
+                       libmono_ldflags="-pthread"
                else
                        LDFLAGS="$LDFLAGS $PTHREAD_LIBS"
                        libmono_ldflags="$PTHREAD_LIBS"
                fi
+               CPPFLAGS="$CPPFLAGS -DPLATFORM_BSD -DPLATFORM_BSD6"
                need_link_unlink=yes
                AC_DEFINE(PTHREAD_POINTER_ID)
                libdl=
                libgc_threads=pthreads
+               with_sigaltstack=yes
 # TLS is only partially implemented on -CURRENT (compiler support
 # but NOT library support)
 #
-               with_nptl=no
                with_tls=pthread
                ;;
        *-*-*openbsd*)
@@ -146,7 +181,7 @@ case "$host" in
                ;;
        *-*-linux*)
                platform_win32=no
-               CPPFLAGS="$CPPFLAGS -DGC_LINUX_THREADS -D_GNU_SOURCE -D_REENTRANT"
+               CPPFLAGS="$CPPFLAGS -DGC_LINUX_THREADS -D_GNU_SOURCE -D_REENTRANT -DUSE_MMAP -DUSE_MUNMAP"
                libmono_cflags="-D_REENTRANT"
                libmono_ldflags="-lpthread"
                libdl="-ldl"
@@ -164,14 +199,14 @@ case "$host" in
                 ;;
        *-*-solaris*)
                platform_win32=no
-               CPPFLAGS="$CPPFLAGS -DGC_SOLARIS_THREADS -DGC_SOLARIS_PTHREADS -D_REENTRANT"
+               CPPFLAGS="$CPPFLAGS -DGC_SOLARIS_THREADS -DGC_SOLARIS_PTHREADS -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -DUSE_MMAP -DUSE_MUNMAP"
                need_link_unlink=yes
                libmono_cflags="-D_REENTRANT"
                libgc_threads=pthreads
                ;;
        *-*-darwin*)
                platform_win32=no
-               CPPFLAGS="$CPPFLAGS -no-cpp-precomp -D_THREAD_SAFE -DGC_MACOSX_THREADS"
+               CPPFLAGS="$CPPFLAGS -no-cpp-precomp -D_THREAD_SAFE -DGC_MACOSX_THREADS -DPLATFORM_MACOSX"
                libmono_cflags="-D_THREAD_SAFE"
                LDFLAGS="$LDFLAGS -pthread"
                libmono_ldflags="-pthread"
@@ -200,6 +235,7 @@ AC_CHECK_TOOL(CC, gcc, gcc)
 AC_PROG_CC
 AM_PROG_CC_STDC
 AC_PROG_INSTALL
+AC_PROG_AWK
 dnl We should use AM_PROG_AS, but it's not available on automake/aclocal 1.4
 : ${CCAS='$(CC)'}
 # Set ASFLAGS if not already set.
@@ -217,18 +253,25 @@ dnl may require a specific autoconf version
 dnl AC_PROG_CC_FOR_BUILD
 dnl CC_FOR_BUILD not automatically detected
 CC_FOR_BUILD=$CC
+CFLAGS_FOR_BUILD=$CFLAGS
 BUILD_EXEEXT=
 if test "x$cross_compiling" = "xyes"; then
        CC_FOR_BUILD=cc
+       CFLAGS_FOR_BUILD=
        BUILD_EXEEXT=""
 fi
 AC_SUBST(CC_FOR_BUILD)
+AC_SUBST(CFLAGS_FOR_BUILD)
 AC_SUBST(HOST_CC)
 AC_SUBST(BUILD_EXEEXT)
 
+AM_CONDITIONAL(CROSS_COMPILING, [test x$cross_compiling = xyes])
+
 # Set STDC_HEADERS
 AC_HEADER_STDC
 AC_LIBTOOL_WIN32_DLL
+# This causes monodis to not link correctly
+#AC_DISABLE_FAST_INSTALL
 AM_PROG_LIBTOOL
 
 # Test whenever ld supports -version-script
@@ -249,11 +292,28 @@ AM_CONDITIONAL(HAVE_ZLIB, test x$have_zlib = xyes)
 # for mono/metadata/debug-symfile.c
 AC_CHECK_HEADERS(elf.h)
 
+# for support
+AC_CHECK_HEADERS(poll.h)
+AC_CHECK_HEADERS(sys/poll.h)
+AC_CHECK_HEADERS(sys/wait.h)
+AC_CHECK_HEADERS(grp.h)
+AC_CHECK_HEADERS(syslog.h)
+
 # for mono/dis
 AC_CHECK_HEADERS(wchar.h)
-AC_CHECK_HEADERS(ieeefp.h)
+case "$host" in
+       *-*-*freebsd6*)
+               AC_CHECK_HEADERS(ieeefp.h)
+       ;;
+       *-*-*freebsd*)
+               /* Only freebsd6 has a working ieeefp.h */
+       ;;
+       *)
+               AC_CHECK_HEADERS(ieeefp.h)
+       ;;
+esac
 AC_MSG_CHECKING(for isinf)
-AC_TRY_COMPILE([#include <math.h>], [
+AC_TRY_LINK([#include <math.h>], [
        int f = isinf (1);
 ], [
        AC_MSG_RESULT(yes)
@@ -305,20 +365,23 @@ fi
 mcs_topdir='$(top_srcdir)/'$mcsdir
 mcs_topdir_from_srcdir='$(top_builddir)/'$mcsdir
 
+## Maybe should also disable if mcsdir is invalid.  Let's punt the issue for now.
+AM_CONDITIONAL(BUILD_MCS, [test x$cross_compiling = xno])
+
 AC_SUBST([mcs_topdir])
 AC_SUBST([mcs_topdir_from_srcdir])
 
 AC_ARG_WITH([libgdiplus], 
-       [  --with-libgdiplus=no|sibling|<path>  Override the libgdiplus used for System.Drawing tests (defaults to NO)], 
-       [], [with_libgdiplus=no])
+       [  --with-libgdiplus=installed|sibling|<path>   Override the libgdiplus used for System.Drawing tests (defaults to NO)], 
+       [], [with_libgdiplus=installed])
 
 case $with_libgdiplus in
-no) libgdiplus_topdir= ;;
-yes|sibling) libgdiplus_topdir=`cd ../libgdiplus && pwd` ;;
-/*) libgdiplus_topdir=$with_libgdiplus ;;
-*) libgdiplus_topdir=`cd $with_libgdiplus && pwd` ;;
+no|installed) libgdiplus_loc= ;;
+yes|sibling) libgdiplus_loc=`cd ../libgdiplus && pwd`/src/libgdiplus.la ;;
+/*) libgdiplus_loc=$with_libgdiplus ;;
+*) libgdiplus_loc=`pwd`/$with_libgdiplus ;;
 esac
-AC_SUBST([libgdiplus_topdir])
+AC_SUBST([libgdiplus_loc])
 
 AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
 if test "x$PKG_CONFIG" = "xno"; then
@@ -332,15 +395,15 @@ BUILD_GLIB_LIBS=`$PKG_CONFIG --libs glib-2.0 gthread-2.0`
 AC_SUBST(BUILD_GLIB_CFLAGS)
 AC_SUBST(BUILD_GLIB_LIBS)
 
-PKG_PATH=
+pkg_config_path=
 AC_ARG_WITH(crosspkgdir, [  --with-crosspkgdir=/path/to/pkg-config/dir],
        if test x$with_crosspkgdir = "x"; then
                if test -s $PKG_CONFIG_PATH; then
-                       PKG_PATH=$PKG_CONFIG_PATH
+                       pkg_config_path=$PKG_CONFIG_PATH
                fi
        else
-               PKG_PATH=$with_crosspkgdir
-               PKG_CONFIG_PATH=$PKG_PATH
+               pkg_config_path=$with_crosspkgdir
+               PKG_CONFIG_PATH=$pkg_config_path
                export PKG_CONFIG_PATH
        fi
 )
@@ -360,7 +423,7 @@ AC_SUBST(GLIB_LIBS)
 AC_SUBST(GMODULE_CFLAGS)
 AC_SUBST(GMODULE_LIBS)
 
-if test x$platform_win32 = xyes; then   
+if test x$cross_compiling$platform_win32 = xnoyes; then
    AC_MSG_CHECKING(for cygwin glib2-dev package)
    if [ cygcheck --f /usr/lib/libglib-2.0.dll.a | grep -q glib2-devel ]; then
       AC_MSG_RESULT(found)
@@ -411,18 +474,45 @@ if test "x$enable_static" = "xno"; then
    with_static_mono=no
 fi
 
+if test "x$platform_win32" = "xyes"; then
+   # Boehm GC requires the runtime to be in its own dll
+   with_static_mono=no
+fi
+
 AM_CONDITIONAL(STATIC_MONO, test x$with_static_mono != xno)
 
+AC_ARG_WITH(xen_opt,   [  --with-xen_opt=yes,no      Enable Xen-specific behaviour],[],[with_xen_opt=yes])
+if test "x$with_xen_opt" = "xyes"; then
+       AC_DEFINE(MONO_XEN_OPT, 1, [Xen-specific behaviour])
+       ORIG_CFLAGS=$CFLAGS
+       CFLAGS="$CFLAGS -mno-tls-direct-seg-refs"
+       AC_MSG_CHECKING(for -mno-tls-direct-seg-refs option to gcc)
+       AC_TRY_COMPILE([], [
+                                          void main () { }
+       ], [
+          AC_MSG_RESULT(yes)
+       ], [
+          AC_MSG_RESULT(no)
+          CFLAGS=$ORIG_CFLAGS
+       ])
+fi
+
+DISABLED_FEATURES=none
+
 AC_ARG_ENABLE(minimal, [  --enable-minimal=LIST      drop support for LIST subsystems.
-  LIST is a comma-separated list from: aot, profiler, decimal, pinvoke, debug, reflection_emit.],
+  LIST is a comma-separated list from: aot, profiler, decimal, pinvoke, debug,
+  reflection_emit, large_code, logging, com, ssa, generics.],
 [
        for feature in `echo "$enable_minimal" | sed -e "s/,/ /g"`; do
                eval "mono_feature_disable_$feature='yes'"
                AC_MSG_NOTICE([Disabled support for feature: $feature])
        done
+       DISABLED_FEATURES=$enable_minimal
        disabled="Disabled:    $enable_minimal"
 ],[])
 
+AC_DEFINE_UNQUOTED(DISABLED_FEATURES, "$DISABLED_FEATURES", [String of disabled features])
+
 if test "x$mono_feature_disable_aot" = "xyes"; then
        AC_DEFINE(DISABLE_AOT, 1, [Disable AOT support])
 fi
@@ -447,6 +537,38 @@ if test "x$mono_feature_disable_reflection_emit" = "xyes"; then
        AC_DEFINE(DISABLE_REFLECTION_EMIT, 1, [Disable reflection emit support])
 fi
 
+if test "x$mono_feature_disable_large_code" = "xyes"; then
+       AC_DEFINE(DISABLE_LARGE_CODE, 1, [Disable support for huge assemblies])
+fi
+
+if test "x$mono_feature_disable_logging" = "xyes"; then
+       AC_DEFINE(DISABLE_LOGGING, 1, [Disable support debug logging])
+fi
+
+if test "x$mono_feature_disable_com" = "xyes"; then
+       AC_DEFINE(DISABLE_COM, 1, [Disable COM support])
+fi
+
+if test "x$mono_feature_disable_ssa" = "xyes"; then
+       AC_DEFINE(DISABLE_SSA, 1, [Disable advanced SSA JIT optimizations])
+fi
+
+if test "x$mono_feature_disable_generics" = "xyes"; then
+       AC_DEFINE(DISABLE_GENERICS, 1, [Disable generics support])
+fi
+
+AC_MSG_CHECKING(for visibility __attribute__)
+AC_TRY_COMPILE([], [
+   void __attribute__ ((visibility ("hidden"))) doit (void) {}
+   void main () { doit (); }
+], [
+   have_visibility_hidden=yes
+   AC_MSG_RESULT(yes)
+], [
+   have_visibility_hidden=no
+   AC_MSG_RESULT(no)
+])
+
 LIBGC_CFLAGS=
 LIBGC_LIBS=
 LIBGC_STATIC_LIBS=
@@ -472,6 +594,9 @@ case "x$gc" in
                AC_CHECK_LIB(gc, GC_gcj_malloc, found_gcj_malloc="yes",,$libdl)
                if test "x$found_gcj_malloc" = "xyes"; then
                        AC_DEFINE(HAVE_GC_GCJ_MALLOC)
+                       AC_DEFINE_UNQUOTED(USED_GC_NAME, "System Boehm (with typed GC)", [GC description])
+               else
+                       AC_DEFINE_UNQUOTED(USED_GC_NAME, "System Boehm (no typed GC)", [GC description])
                fi
                AC_CHECK_LIB(gc, GC_enable, found_gc_enable="yes",,$libdl)
                if test "x$found_gc_enable" = "xyes"; then
@@ -482,6 +607,11 @@ case "x$gc" in
        xincluded)
                AC_CONFIG_SUBDIRS(libgc)
 
+               # Pass CPPFLAGS to libgc configure
+               # Maybe we should use a separate variable for this to avoid passing useless and
+               # potentially problematic defines to libgc (like -D_FILE_OFFSET_BITS=64)
+               export CPPFLAGS
+
                found_boehm=yes
                gc_headers=yes
                use_included_gc=yes
@@ -500,19 +630,37 @@ case "x$gc" in
                # The included libgc contains GCJ support
                AC_DEFINE(HAVE_GC_GCJ_MALLOC)
                AC_DEFINE(HAVE_GC_ENABLE)
+               AC_DEFINE_UNQUOTED(USED_GC_NAME, "Included Boehm (with typed GC)", [GC description])
+               ;;
+
+       xsgen)
+               found_boehm=no
+               gc_headers=no
+               use_included_gc=no
+               AC_DEFINE(HAVE_SGEN_GC,1,[Using the simple generational GC.])
+               AC_DEFINE(HAVE_MOVING_COLLECTOR,1,[The GC can move objects.])
+               AC_DEFINE(HAVE_WRITE_BARRIERS,1,[The GC needs write barriers.])
+               AC_DEFINE_UNQUOTED(USED_GC_NAME, "Simple generational", [GC description])
                ;;
 
        xnone)
                AC_MSG_WARN("Compiling mono without GC.")
+               AC_DEFINE_UNQUOTED(USED_GC_NAME, "none", [GC description])
+               AC_DEFINE(HAVE_NULL_GC,1,[No GC support.])
                ;;
        *)
                AC_MSG_ERROR([Invalid argument to --with-gc.])
                ;;
 esac
 
+AC_ARG_WITH(large-heap, [  --with-large-heap=yes,no    Enable support for GC heaps larger than 3GB], [large_heap=$withval], [large_heap=no])
+if test "x$large_heap" = "xyes"; then
+   echo "FOO"
+   CPPFLAGS="$CPPFLAGS -DLARGE_CONFIG"
+fi
 
 # tell libgc/configure about what we want
-ac_configure_args="$ac_configure_args --disable-embed-check --with-libgc-threads=$libgc_threads"
+ac_configure_args="$ac_configure_args --disable-embed-check --with-libgc-threads=$libgc_threads $libgc_configure_args"
 
 AM_CONDITIONAL(INCLUDED_LIBGC, test x$use_included_gc = xyes)
 AC_SUBST(LIBGC_CFLAGS)
@@ -539,6 +687,8 @@ if test x$platform_win32 = xno; then
 
        AC_SUBST(ikvm_native_dir)
 
+       AC_CHECK_HEADERS(execinfo.h)
+
        AC_CHECK_FUNCS(getgrgid_r)
        AC_CHECK_FUNCS(getgrnam_r)
        AC_CHECK_FUNCS(getpwnam_r)
@@ -557,7 +707,7 @@ if test x$platform_win32 = xno; then
        # potential compiler bugs.  Defines LARGE_FILE_SUPPORT, adds $1 to
        # CPPFLAGS and sets $large_offt to yes if the test succeeds
        large_offt=no
-       AC_DEFUN(LARGE_FILES, [
+       AC_DEFUN([LARGE_FILES], [
                large_CPPFLAGS=$CPPFLAGS
                CPPFLAGS="$CPPFLAGS $1"
                AC_TRY_RUN([
@@ -674,6 +824,20 @@ if test x$platform_win32 = xno; then
                AC_MSG_RESULT(no)
        ])
 
+       dnl *****************************
+    dnl *** Checks for IPV6_PKTINFO ***
+    dnl *****************************
+    AC_MSG_CHECKING(for IPV6_PKTINFO)
+    AC_TRY_COMPILE([#include <netdb.h>], [
+        int level = IPV6_PKTINFO;
+    ], [
+        # Yes, we have it...
+        AC_MSG_RESULT(yes)
+        AC_DEFINE(HAVE_IPV6_PKTINFO)
+    ], [
+        AC_MSG_RESULT(no)
+    ])
        dnl *********************************
        dnl *** Check for struct ip_mreqn ***
        dnl *********************************
@@ -796,6 +960,12 @@ if test x$platform_win32 = xno; then
                *-*-*freebsd4*)
                        AC_CHECK_LIB(pthread, main, LIBS="$LIBS -pthread")
                ;;
+               *-*-*freebsd5*)
+                       AC_CHECK_LIB(pthread, main, LIBS="$LIBS -pthread")
+               ;;
+               *-*-*freebsd6*)
+                       AC_CHECK_LIB(pthread, main, LIBS="$LIBS -pthread")
+               ;;
                *)
                        AC_CHECK_LIB(pthread, main, LIBS="$LIBS -lpthread")
                ;;
@@ -815,6 +985,8 @@ if test x$platform_win32 = xno; then
                AC_DEFINE(USE_MONO_MUTEX)
        ])
        AC_CHECK_FUNCS(pthread_attr_setstacksize)
+       AC_CHECK_FUNCS(pthread_attr_getstack)
+       AC_CHECK_FUNCS(pthread_get_stacksize_np pthread_get_stackaddr_np)
 
        dnl ***********************************
        dnl *** Checks for working __thread ***
@@ -825,7 +997,6 @@ if test x$platform_win32 = xno; then
        else
                AC_TRY_RUN([
                        #include <pthread.h>
-
                        __thread int i;
                        static int res1, res2;
 
@@ -874,7 +1045,9 @@ if test x$platform_win32 = xno; then
                        #include <signal.h>
                        #include <pthread.h>
                        #include <sys/wait.h>
-
+                       #if defined(__FreeBSD__) || defined(__NetBSD__)
+                       #define SA_STACK SA_ONSTACK
+                       #endif
                        static void
                        sigsegv_signal_handler (int _dummy, siginfo_t *info, void *context)
                        {
@@ -900,23 +1073,23 @@ if test x$platform_win32 = xno; then
 
                                sa.sa_sigaction = sigsegv_signal_handler;
                                sigemptyset (&sa.sa_mask);
-                               sa.sa_flags = SA_SIGINFO | SA_STACK;
+                               sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
                                if (sigaction (SIGSEGV, &sa, NULL) == -1) {
-                                       perror ("lala");
+                                       perror ("sigaction");
                                        return;
                                }
 
                                sas.ss_sp = malloc (SIGSTKSZ);
                                sas.ss_size = SIGSTKSZ;
-                               sas.ss_flags = SS_ONSTACK;
+                               sas.ss_flags = 0;
                                if (sigaltstack (&sas, NULL) == -1) {
-                                       perror ("lala");
+                                       perror ("sigaltstack");
                                        return;
                                }
 
                                pthread_attr_init (&attr);
                                if (pthread_create(&id, &attr, loop, &attr) != 0) {
-                                       printf ("failed\n");
+                                       printf ("pthread_create\n");
                                        return;
                                }
 
@@ -1063,20 +1236,66 @@ if test x$platform_win32 = xno; then
                AC_DEFINE_UNQUOTED(SIGVAL_PTR,$SIGVAL_PTR,[Pointer field name in 'union sigval'])
        fi
 
+       dnl **********************************
+       dnl *** epoll                      ***
+       dnl **********************************
+       AC_CHECK_HEADERS(sys/epoll.h)
+       haveepoll=no
+       AC_CHECK_FUNCS(epoll_ctl, [haveepoll=yes], )
+       if test "x$haveepoll" = "xyes" -a "x$ac_cv_header_sys_epoll_h" = "xyes" ; then
+               AC_DEFINE(HAVE_EPOLL, 1, [epoll supported])
+       fi
+
+       dnl ******************************
+       dnl *** Checks for SIOCGIFCONF ***
+       dnl ******************************
+       AC_CHECK_HEADERS(sys/ioctl.h)
+       AC_CHECK_HEADERS(net/if.h)
+       AC_MSG_CHECKING(for ifreq)
+       AC_TRY_COMPILE([
+               #include <sys/ioctl.h>
+               #include <net/if.h>
+               ], [
+               struct ifconf ifc;
+               struct ifreq *ifr;
+               void *x;
+               ifc.ifc_len = 0;
+               ifc.ifc_buf = NULL;
+               x = (void *) &ifr->ifr_addr;
+               ],[
+                       AC_MSG_RESULT(yes)
+                       AC_DEFINE(HAVE_SIOCGIFCONF, 1, [Can get interface list])
+               ], [
+                       AC_MSG_RESULT(no)
+               ])
        dnl **********************************
        dnl *** Checks for MonoPosixHelper ***
        dnl **********************************
+       AC_CHECK_FUNC(setkey, ,
+               AC_CHECK_LIB(crypt, setkey, [ 
+                       AC_DEFINE(HAVE_SETKEY, 1, [Define if setkey(3) is available]) 
+                       CRYPT_LIBS="-lcrypt" 
+               ])
+       )
+       AC_SUBST(CRYPT_LIBS)
        AC_CHECK_HEADERS(checklist.h)
        AC_CHECK_HEADERS(fstab.h)
+       AC_CHECK_HEADERS(attr/xattr.h)
+       AC_CHECK_HEADERS(sys/extattr.h)
        AC_CHECK_HEADERS(sys/sendfile.h)
        AC_CHECK_HEADERS(sys/statvfs.h)
        AC_CHECK_HEADERS(sys/vfstab.h)
+       AC_CHECK_HEADERS(sys/xattr.h)
+       AC_CHECK_HEADERS(sys/mman.h)
        AC_CHECK_FUNCS(getdomainname)
        AC_CHECK_FUNCS(setdomainname)
        AC_CHECK_FUNCS(fgetgrent)
        AC_CHECK_FUNCS(fgetpwent)
        AC_CHECK_FUNCS(fgetpwent)
        AC_CHECK_FUNCS(getfsstat)
+       AC_CHECK_FUNCS(lutimes)
+       AC_CHECK_FUNCS(mremap)
+       AC_CHECK_FUNCS(remap_file_pages)
        AC_CHECK_FUNCS(posix_fadvise)
        AC_CHECK_FUNCS(posix_fallocate)
        AC_CHECK_FUNCS(posix_madvise)
@@ -1096,6 +1315,12 @@ if test x$platform_win32 = xno; then
                [#include <sys/types.h>
                 #include <dirent.h>])
 
+       dnl Favour xattr through glibc, but use libattr if we have to
+       AC_CHECK_FUNC(lsetxattr, ,
+               AC_CHECK_LIB(attr, lsetxattr, XATTR_LIB="-lattr",)
+       )
+       AC_SUBST(XATTR_LIB)
+
        dnl *********************************
        dnl *** Check for Console 2.0 I/O ***
        dnl *********************************
@@ -1106,11 +1331,16 @@ if test x$platform_win32 = xno; then
         #endif
        ])
        AC_CHECK_HEADERS([termios.h])
+
+       dnl * This is provided in io-layer, but on windows it's only available
+       dnl * on xp+
+       AC_DEFINE(HAVE_GETPROCESSID, 1, [Define if GetProcessId is available])
 else
        jdk_headers_found=no
        AC_CHECK_LIB(ws2_32, main, LIBS="$LIBS -lws2_32", AC_ERROR(bad mingw install?))
        AC_CHECK_LIB(psapi, main, LIBS="$LIBS -lpsapi", AC_ERROR(bad mingw install?))
        AC_CHECK_LIB(ole32, main, LIBS="$LIBS -lole32", AC_ERROR(bad mingw install?))
+       AC_CHECK_LIB(oleaut32, main, LIBS="$LIBS -loleaut32", AC_ERROR(bad mingw install?))
 
        dnl *********************************
        dnl *** Check for struct ip_mreqn ***
@@ -1139,6 +1369,7 @@ else
                        AC_MSG_RESULT(no)
                ])
        ])
+       AC_CHECK_FUNCS(GetProcessId)
 fi
 
 dnl socklen_t check
@@ -1257,38 +1488,6 @@ if test "x$try_shared_handles" != "xyes"; then
        AC_SUBST(DISABLE_SHARED_HANDLES)
 fi
 
-#
-# ICU 
-#
-ICU_CFLAGS=""
-ICU_LIBS=""
-enable_glob="normal;  default"
-
-probe_icu=false
-AC_ARG_WITH(icu, [  --with-icu=yes/no],
-       if test x$with_icu = xno; then
-          probe_icu=false;
-          AC_MSG_RESULT(Will not probe for ICU)
-       fi
-       if test x$with_icu = xyes; then
-          probe_icu=true;
-       fi
-)
-
-if $probe_icu; then
-       AC_PATH_PROG(ICU_CONFIG, icu-config, no)
-       if test "x$ICU_CONFIG" = "xno" -o ! -x "$ICU_CONFIG"; then
-               enable_glob="ICU not found, using non-ICU globalization code."
-       else
-               enable_glob="ICU, unsupported. Version: `$ICU_CONFIG --version`"
-               AC_DEFINE(HAVE_ICU)
-               ICU_CFLAGS=`$ICU_CONFIG --cppflags`
-               ICU_LIBS=`$ICU_CONFIG --ldflags`
-       fi
-fi
-AC_SUBST(ICU_CFLAGS)
-AC_SUBST(ICU_LIBS)
-
 AC_ARG_ENABLE(nunit-tests, [ --enable-nunit-tests      Run the nunit tests of the class library on 'make check'])
 AM_CONDITIONAL(ENABLE_NUNIT_TESTS, [test x$enable_nunit_tests = xyes])
 
@@ -1299,6 +1498,9 @@ JIT_SUPPORTED=no
 INTERP_SUPPORTED=no
 LIBC="libc.so.6"
 INTL="libc.so.6"
+SQLITE="libsqlite.so.0"
+SQLITE3="libsqlite3.so.0"
+X11="libX11.so"
 
 jit_wanted=false
 interp_wanted=false
@@ -1312,6 +1514,23 @@ case "$host" in
                arch_target=x86;
                JIT_SUPPORTED=yes
                jit_wanted=true
+               case $host_os in
+                 solaris*)
+                       LIBC="libc.so"
+                       INTL="libintl.so"
+
+                       # On solaris 10 x86, gcc prints a warning saying 'visibility attribute not supported on this configuration; ignored', but linking fails. A test case:
+                       # int astruct __attribute__ ((visibility ("hidden")));
+                       # void foo ()
+                       # {
+                       #       void *p = &astruct;
+                       # }
+                       # gcc -fPIC --shared -o libfoo.so foo.c
+                       # yields:
+                       # foo.c:6: warning: visibility attribute not supported in this configuration; ignored
+                       # ld: fatal: relocation error: R_386_GOTOFF: file /var/tmp//ccxYR96k.o: symbol astruct: relocation must bind locally
+                       have_visibility_hidden=no
+               esac
                ;;
        x86_64-*-* | amd64-*-*)
                TARGET=AMD64;
@@ -1319,6 +1538,17 @@ case "$host" in
                JIT_SUPPORTED=yes
                jit_wanted=true
                ;;
+       ia64-*-*)
+               TARGET=IA64
+               arch_target=ia64
+               ACCESS_UNALIGNED="no"
+               JIT_SUPPORTED=yes
+               jit_wanted=true
+               LIBC="libc.so.6.1"
+               INTL="libc.so.6.1"
+               AC_CHECK_LIB(unwind, _U_dyn_register, [], [AC_MSG_ERROR(library libunwind not found)])
+               libmono_ldflags="-lunwind"
+               ;;
        sparc*-*-*)
                if test "x$ac_cv_sizeof_void_p" = "x8"; then
                   TARGET=SPARC64
@@ -1328,11 +1558,19 @@ case "$host" in
                arch_target=sparc;
                JIT_SUPPORTED=yes
                ACCESS_UNALIGNED="no"
-               LIBC="libc.so"
-               INTL="libintl.so"
+               case $host_os in
+                 linux*) ;;
+                 *)
+                       LIBC="libc.so"
+                       INTL="libintl.so"
+               esac
                jit_wanted=true
                if test x"$GCC" = xyes; then
-                       CFLAGS="$CFLAGS -Wno-cast-align"
+                       # We don't support v8 cpus
+                       CFLAGS="$CFLAGS -Wno-cast-align -mcpu=v9"
+               fi
+               if test x"$AR" = xfalse; then
+                       AC_MSG_ERROR([The required utility 'ar' is not found in your PATH. Usually it can be found in /usr/ccs/bin.])
                fi
                ;;
        alpha*-*-linux* | alpha*-*-osf*)
@@ -1342,23 +1580,15 @@ case "$host" in
                INTERP_SUPPORTED=yes
                interp_wanted=true
                arch_target=alpha;
+               case $host_os in
+                 linux*)
+                       LIBC="libc.so.6.1"
+                       INTL="libc.so.6.1"
+               esac
               ;;
        *-*-mingw*|*-*-cygwin*)
                INTL="intl"
                ;;
-#      ia64-*-linux* | ia64-*-hpux*)
-#              TARGET=IA64;
-#              arch_target=ia64;
-#              JIT_SUPPORTED=no;
-#              ACCESS_UNALIGNED="no";
-#              case "$host_os" in
-#                      linux*) LIBC="libc.so.6.1";;
-#                      hpux*)  LIBC="libc.so.1";;
-#              esac
-#              ;;
-#       m68k-*-linux*)
-#              TARGET=M68K
-#              ;;
        hppa2.0w-hp-hpux11.00 | hppa64-hp-hpux11.00)
                TARGET=HPPA;
                arch_target=hppa; 
@@ -1382,12 +1612,12 @@ case "$host" in
                JIT_SUPPORTED=yes
                jit_wanted=true
                ;;
-       arm-*-linux-* | armv4l-*-linux-*)
+       arm*-linux*)
                TARGET=ARM;
                arch_target=arm;
                ACCESS_UNALIGNED="no"
-               INTERP_SUPPORTED=yes
-               interp_wanted=true
+               JIT_SUPPORTED=yes
+               jit_wanted=true
                ;;
        s390-*-linux*)
                TARGET=S390;
@@ -1395,6 +1625,7 @@ case "$host" in
                arch_target=s390;
                ACCESS_UNALIGNED="no"
                JIT_SUPPORTED=yes
+               jit_wanted=true
                ;;
        s390x-*-linux*)
                TARGET=S390x;
@@ -1402,9 +1633,14 @@ case "$host" in
                arch_target=s390x;
                ACCESS_UNALIGNED="no"
                JIT_SUPPORTED=yes
+               jit_wanted=true
                ;;
 esac
 
+if test "x$have_visibility_hidden" = "xyes"; then
+   AC_DEFINE(HAVE_VISIBILITY_HIDDEN, 1, [Support for the visibility ("hidden") attribute])
+fi
+
 AC_ARG_WITH(jit, [  --with-jit=yes,no       If you want to build scripts that default to the JIT],[
        if test x$withval = xyes; then
           jit_wanted=true
@@ -1434,7 +1670,7 @@ if test x$JIT_SUPPORTED = xyes; then
       fi
    fi
 else
-   if $interp_wanted; then
+   if test x$interp_wanted = xtrue; then
       jit_status="interpreter"
    else
       AC_ERROR(No JIT or interpreter support available or selected.)
@@ -1446,10 +1682,13 @@ AM_CONDITIONAL(USE_JIT, test x$USEJIT = xtrue)
 libsuffix=".so"
 
 case "$host" in
-     powerpc-*-darwin*)
+     *-*-darwin*)
        libsuffix=".dylib"
        LIBC="libc.dylib"
        INTL="libintl.dylib"
+       SQLITE="libsqlite.0.dylib"
+       SQLITE3="libsqlite3.0.dylib"
+       X11="libX11.dylib"
        ;;
      *-*-*netbsd*)
        LIBC="libc.so.12"
@@ -1463,7 +1702,25 @@ case "$host" in
        LIBC="libc.so"
        INTL="libintl.so"
        ;;
+    *-*-*linux*)
+       AC_PATH_X
+       AC_MSG_CHECKING(for the soname of libX11.so)
+       for i in $x_libraries /usr/lib /usr/lib64; do
+               for r in 4 5 6; do
+                       if test -f $i/libX11.so.$r; then
+                               X11=libX11.so.$r
+                               AC_MSG_RESULT($X11)
+                       fi
+               done
+       done
+       
+       if test "x$X11" = "xlibX11.so"; then
+               AC_MSG_WARN([Could not find X development libs. Do you have the -devel package installed? WinForms may not work...]);
+       fi
+       ;;
 esac
+
+
 AC_SUBST(libsuffix)
 
 if test "x$TARGET" != "xAMD64"; then
@@ -1480,8 +1737,8 @@ if test "x$TARGET" = "xAMD64" -o "x$TARGET" = "xX86"; then
                #
                rm -f conftest.c conftest.so conftest
                echo "static __thread int foo; void main () { foo = 5; }" > conftest.c
-               gcc -fPIC --shared -o conftest.so conftest.c > /dev/null 2>&1
-               gcc -o conftest conftest.so > /dev/null 2>&1
+               $CC -fPIC --shared -o conftest.so conftest.c > /dev/null 2>&1
+               $CC -o conftest conftest.so > /dev/null 2>&1
                if test ! -f conftest; then
                   AC_MSG_WARN([Disabling usage of __thread.]);
                   with_tls=pthread
@@ -1490,11 +1747,28 @@ if test "x$TARGET" = "xAMD64" -o "x$TARGET" = "xX86"; then
        fi
 fi
 
+mono_debugger_supported=no
+if test "x$TARGET" = "xAMD64" -o "x$TARGET" = "xX86"; then
+       if test x$use_included_gc = xyes; then
+               case "$host" in
+               *-*-*linux*)
+                       mono_debugger_supported=yes
+                       ;;
+               esac
+       fi
+fi
+
+AC_MSG_CHECKING(if the Mono Debugger is supported on this platform)
+if test "x$mono_debugger_supported" = "xyes"; then
+       AC_DEFINE(MONO_DEBUGGER_SUPPORTED,1,[The Mono Debugger is supported on this platform])
+fi
+AC_MSG_RESULT($mono_debugger_supported)
+AM_CONDITIONAL(MONO_DEBUGGER_SUPPORTED, test x$mono_debugger_supported = xyes)
+
 if test "x$with_tls" = "x__thread"; then
        AC_DEFINE(HAVE_KW_THREAD)
-   # Pass the information to libgc
+       # Pass the information to libgc
        CPPFLAGS="$CPPFLAGS -DUSE_COMPILER_TLS"
-       export CPPFLAGS
        AC_MSG_CHECKING(if the tls_model attribute is supported)
        AC_TRY_COMPILE([static __thread int foo __attribute__((tls_model("initial-exec")));], [
                ], [
@@ -1533,10 +1807,10 @@ if test ${ACCESS_UNALIGNED} = no; then
        CPPFLAGS="$CPPFLAGS -DNO_UNALIGNED_ACCESS"
 fi
 
-PREVIEW=no
+PREVIEW=yes
 AC_ARG_WITH(preview, [ --with-preview=yes,no     If you want to install the 2.0 FX preview],[
-       if test x$with_preview = xyes; then
-             PREVIEW=yes
+       if test x$with_preview = xno; then
+             PREVIEW=no
        fi
 ])
 
@@ -1563,6 +1837,9 @@ AM_CONDITIONAL(INCLUDED_LIBGC, test x$gc = xincluded)
 
 AC_SUBST(LIBC)
 AC_SUBST(INTL)
+AC_SUBST(SQLITE)
+AC_SUBST(SQLITE3)
+AC_SUBST(X11)
 
 AC_SUBST(arch_target)
 AC_SUBST(CFLAGS)
@@ -1588,11 +1865,13 @@ fi
 AC_SUBST(mono_cfg_dir)
 
 AC_CONFIG_FILES([runtime/mono-wrapper],[chmod +x runtime/mono-wrapper])
+AC_CONFIG_FILES([runtime/monodis-wrapper],[chmod +x runtime/monodis-wrapper])
+AC_CONFIG_FILES([runtime/semdel-wrapper],[chmod +x runtime/semdel-wrapper])
 
 AC_CONFIG_COMMANDS([runtime/etc/mono/1.0/machine.config],
 [   depth=../../../..
     case $srcdir in
-    [\\/$]* | ?:[\\/]* ) reldir=$srcdir ;;
+    [[\\/$]]* | ?:[[\\/]]* ) reldir=$srcdir ;;
     .) reldir=$depth ;;
     *) reldir=$depth/$srcdir ;;
     esac
@@ -1606,7 +1885,7 @@ AC_CONFIG_COMMANDS([runtime/etc/mono/1.0/machine.config],
 AC_CONFIG_COMMANDS([runtime/etc/mono/2.0/machine.config],
 [   depth=../../../..
     case $srcdir in
-    [\\/$]* | ?:[\\/]* ) reldir=$srcdir ;;
+    [[\\/$]]* | ?:[[\\/]]* ) reldir=$srcdir ;;
     .) reldir=$depth ;;
     *) reldir=$depth/$srcdir ;;
     esac
@@ -1617,11 +1896,30 @@ AC_CONFIG_COMMANDS([runtime/etc/mono/2.0/machine.config],
     cd $depth
 ],[LN_S='$LN_S'])
 
+AC_CONFIG_COMMANDS([runtime/etc/mono/2.0/web.config],
+[   depth=../../../..
+    case $srcdir in
+    [[\\/$]]* | ?:[[\\/]]* ) reldir=$srcdir ;;
+    .) reldir=$depth ;;
+    *) reldir=$depth/$srcdir ;;
+    esac
+    $ac_aux_dir/install-sh -d runtime/etc/mono/2.0
+    cd runtime/etc/mono/2.0
+    rm -f web.config
+    $LN_S $reldir/data/net_2_0/web.config web.config
+    cd $depth
+],[LN_S='$LN_S'])
+
 AC_OUTPUT([
 Makefile
 mint.pc
 mono.pc
+mono-cairo.pc
+dotnet.pc
+mono-uninstalled.pc
 scripts/mono-nunit.pc
+scripts/mono-find-provides
+scripts/mono-find-requires
 mono/Makefile
 mono/utils/Makefile
 mono/metadata/Makefile
@@ -1629,8 +1927,6 @@ mono/dis/Makefile
 mono/cil/Makefile
 mono/arch/Makefile
 mono/os/Makefile
-mono/os/win32/Makefile
-mono/os/unix/Makefile
 mono/arch/x86/Makefile
 mono/arch/amd64/Makefile
 mono/arch/hppa/Makefile
@@ -1640,14 +1936,20 @@ mono/arch/s390/Makefile
 mono/arch/s390x/Makefile
 mono/arch/arm/Makefile
 mono/arch/alpha/Makefile
+mono/arch/ia64/Makefile
 mono/interpreter/Makefile
 mono/tests/Makefile
 mono/tests/tests-config
+mono/tests/cas/Makefile
+mono/tests/cas/assembly/Makefile
+mono/tests/cas/demand/Makefile
+mono/tests/cas/inheritance/Makefile
+mono/tests/cas/linkdemand/Makefile
+mono/tests/cas/threads/Makefile
 mono/benchmark/Makefile
 mono/monoburg/Makefile
 mono/monograph/Makefile
 mono/io-layer/Makefile
-mono/handles/Makefile
 mono/mini/Makefile
 mono/profiler/Makefile
 ikvm-native/Makefile
@@ -1661,41 +1963,80 @@ data/net_2_0/Makefile
 samples/Makefile
 support/Makefile
 data/config
-mono.spec
 tools/Makefile
 tools/locale-builder/Makefile
 runtime/Makefile
 ])
 
+if test x$platform_win32 = xyes; then
+   # Get rid of 'cyg' prefixes in library names
+   sed -e "s/\/cyg\//\/\//" libtool > libtool.new; mv libtool.new libtool; chmod 755 libtool
+   # libtool seems to inherit -mno-cygwin from our CFLAGS, and uses it to compile its executable
+   # wrapper scripts which use exec(). gcc has no problem compiling+linking this, but the resulting
+   # executable doesn't work...
+   sed -e "s,-mno-cygwin,,g" libtool > libtool.new; mv libtool.new libtool; chmod 755 libtool
+fi
+
 (
   case $prefix in
-  NONE) prefix=/usr/local ;;
+  NONE) prefix=$ac_default_prefix ;;
   esac
   case $exec_prefix in
-  NONE | '${prefix}') exec_prefix=$prefix ;;
+  NONE) exec_prefix='${prefix}' ;;
   esac
 
-  echo "prefix=$prefix" > $srcdir/$mcsdir/build/config.make
-  echo "exec_prefix=$exec_prefix" >> $srcdir/$mcsdir/build/config.make
-  echo "libdir=$libdir" >> $srcdir/$mcsdir/build/config.make
-  echo 'MCS_FLAGS = $(PLATFORM_DEBUG_FLAGS)' >> $srcdir/$mcsdir/build/config.make
+  test -w $srcdir/$mcsdir/build || chmod +w $srcdir/$mcsdir/build
+
+  #
+  # If we are cross compiling, we don't build in the mcs/ tree.  Let us not clobber
+  # any existing config.make.  This allows people to share the same source tree
+  # with different build directories, one native and one cross
+  #
+  if test x$cross_compiling = xno; then
+    echo "prefix=$prefix" > $srcdir/$mcsdir/build/config.make
+    echo "exec_prefix=$exec_prefix" >> $srcdir/$mcsdir/build/config.make
+    echo 'mono_libdir=${exec_prefix}/lib' >> $srcdir/$mcsdir/build/config.make
+    echo 'MCS_FLAGS = $(PLATFORM_DEBUG_FLAGS)' >> $srcdir/$mcsdir/build/config.make
+    echo 'IL_FLAGS = /debug' >> $srcdir/$mcsdir/build/config.make
+    echo "RUNTIME = $mono_build_root/runtime/mono-wrapper" >> $srcdir/$mcsdir/build/config.make
+    echo "ILDISASM = $mono_build_root/runtime/monodis-wrapper" >> $srcdir/$mcsdir/build/config.make
+
+    case $INSTALL in
+    [[\\/$]]* | ?:[[\\/]]* ) mcs_INSTALL=$INSTALL ;;
+    *) mcs_INSTALL=$mono_build_root/$INSTALL ;;
+    esac
+
+    echo "INSTALL = $mcs_INSTALL" >> $srcdir/$mcsdir/build/config.make
+
+    export VERSION
+    [myver=$($AWK 'BEGIN {
+      split (ENVIRON["VERSION"] ".0.0.0", vsplit, ".")
+      print vsplit [1] "." vsplit [2] "." vsplit [3] "." vsplit [4]
+    }')]
+
+    echo "MONO_VERSION = $myver" >> $srcdir/$mcsdir/build/config.make
+  fi
 )
 
-case $libgdiplus_topdir in
-'') libgdiplus_loc='installed (assumed to exist, have not checked)' ;;
-*) libgdiplus_loc=$libgdiplus_topdir ;;
-esac
+libgdiplus_msg=${libgdiplus_loc:-assumed to be installed}
 
 echo "
         mcs source:  $mcs_topdir
        GC:          $gc
-       Globalization:     $enable_glob
        TLS:         $with_tls
        SIGALTSTACK: $with_sigaltstack
        Engine:      $jit_status
        2.0 Alpha:   $PREVIEW
        JNI support: $jdk_headers_found
-       libgdiplus:  $libgdiplus_loc
+       libgdiplus:  $libgdiplus_msg
        $disabled
 
 "
+if test x$gc = xsgen; then
+        echo IMPORTANT:
+       echo IMPORTANT: You have selected an experimental, work-in-progress 
+       echo IMPORTANT: GC engine.  This GC engine is currently not supported
+       echo IMPORTANT: and is not yet ready for use.  
+       echo IMPORTANT:
+       echo IMPORTANT: There are known problems with it, use at your own risk.
+fi