[Vm-dev] Compiling Newspeak Cog VM on Ubuntu 12.10 64bit

Philipp Tessenow philipp at tessenow.org
Mon Feb 25 15:26:50 UTC 2013 

Hi,

I am trying to compile the Newspeak Cog VM on Ubuntu (12.10) 64bit, but
fate is not on my side ;) I'd higly appreciate any help, so here is my
story:

The VM seems to compile correctly, but the newly build nsvm binary
complains about a missing vm-display-X11 plugin.

Using strace, as suggested here
(http://forum.world.st/Cannot-load-vm-display-X11-module-after-build-from-latest-SVN-and-VMM-td104726.html)
shows, that nsvm actually finds vm-display-X11:

<code>
...
open("/home/philipp/stud/masterarbeit/build/squeak/nscogbuild/unixbuild/bld/../../../nsvmlinux/lib/nsvm/4.0-/vm-display-X11",
O_RDONLY|O_CLOEXEC) = 3
...
open("/usr/lib/i386-linux-gnu/libX11.so.6", O_RDONLY|O_CLOEXEC) = 3
...
open("/usr/lib/i386-linux-gnu/libxcb.so.1", O_RDONLY|O_CLOEXEC) = 3
...
open("/usr/lib/i386-linux-gnu/libXau.so.6", O_RDONLY|O_CLOEXEC) = 3
...
open("/usr/lib/i386-linux-gnu/libXdmcp.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240\16\0\0004\0\0\0"..., 512)
= 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=21888, ...}) = 0
mmap2(NULL, 24692, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0)
= 0xfffffffff7198000
mmap2(0xf719d000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4) = 0xfffffffff719d000
close(3)                                = 0
mprotect(0xf719d000, 4096, PROT_READ)   = 0
mprotect(0xf71a1000, 4096, PROT_READ)   = 0
mprotect(0xf71c3000, 4096, PROT_READ)   = 0
mprotect(0xf72f7000, 4096, PROT_READ)   = 0
munmap(0xf72fb000, 108384)              = 0
munmap(0xf71c5000, 1268568)             = 0
munmap(0xf71a3000, 135468)              = 0
munmap(0xf719f000, 12424)               = 0
munmap(0xf7198000, 24692)               = 0
stat64("/home/philipp/stud/masterarbeit/build/squeak/nscogbuild/unixbuild/bld/../../../nsvmlinux/lib/nsvm/4.0-/vm-display-X11.so",
0xffe7562c) = -1 ENOENT (No such file or dir
ectory)
...
</code>

Unfortunately, after finding vm-display-X11 and loading some additional
libraries nsvm aborts and continues searching for other vm-disply-X11
plugins elsewhere.

ldd gives the following output (which seems to be OK for me):
<code>
ldd
/home/philipp/stud/masterarbeit/build/squeak/nsvmlinux/lib/nsvm/4.0-//vm-display-X11
        linux-gate.so.1 =>  (0xf77d0000)
        libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf776d000)
        libX11.so.6 => /usr/lib/i386-linux-gnu/libX11.so.6 (0xf7637000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf748c000)
        /lib/ld-linux.so.2 (0xf77d1000)
        libxcb.so.1 => /usr/lib/i386-linux-gnu/libxcb.so.1 (0xf746a000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf7465000)
        libXau.so.6 => /usr/lib/i386-linux-gnu/libXau.so.6 (0xf7461000)
        libXdmcp.so.6 => /usr/lib/i386-linux-gnu/libXdmcp.so.6 (0xf745a000)
</code>

Reading the unixbuild/HowToBuild file I found the following:
<cite>
Testing an external plugin has completely linked
-------------------------------
You may find that an external plugin compiles and links but does not load.
This is usually because it contans undefined symbols.  To find undefined
symbols, remake the plugin, capturing the link step and then supply
        -Wl,--warn-unresolved-symbols -Wl,--no-allow-shlib-undefined
when manually repeating the link command
</cite>

So I tried to link vm-display-X11 again with warnings enabled:

<code>
gcc -m32 -shared  sqUnixX11.lo sqUnixMozilla.lo  -ldl -lpthread -lm
-lnsl -lX11 -lxcb -lpthread -lc -L/usr/lib32
-Wl,--warn-unresolved-symbols -Wl,--no-allow-shlib-undefined -Wl,-soname
-Wl,vm-display-X11 -o .libs/vm-display-X11
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_get_file_descriptor'
/lib32/libpthread.so.0: warning: undefined reference to
`_dl_deallocate_tls at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_connect'
/lib32/libc.so.6: warning: undefined reference to `_dl_argv at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_generate_id'
/lib32/libpthread.so.0: warning: undefined reference to
`_dl_allocate_tls at GLIBC_PRIVATE'
/lib32/libpthread.so.0: warning: undefined reference to
`_dl_get_tls_static_info at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_connect_to_display_with_auth_info'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_writev'
/lib32/libpthread.so.0: warning: undefined reference to
`__libc_stack_end at GLIBC_2.1'
/lib32/libc.so.6: warning: undefined reference to
`__libc_enable_secure at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `dlsym at GLIBC_2.0'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `dlopen at GLIBC_2.1'
/lib32/libpthread.so.0: warning: undefined reference to
`_dl_make_stack_executable at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_wait_for_reply'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_poll_for_event'
/lib32/libpthread.so.0: warning: undefined reference to
`_dl_allocate_tls_init at GLIBC_PRIVATE'
/lib32/libpthread.so.0: warning: undefined reference to
`_rtld_global at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_get_maximum_request_length'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_poll_for_reply'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_take_socket'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_wait_for_event'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_disconnect'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_connection_has_error'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_get_setup'
/lib32/libpthread.so.0: warning: undefined reference to
`___tls_get_addr at GLIBC_2.3'
/lib32/libpthread.so.0: warning: undefined reference to
`_rtld_global_ro at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../i386-linux-gnu/libX11.so:
warning: undefined reference to `xcb_parse_display'
</code>

That is a lot of warnings. For my unexperienced eyes this looks like
libX11.so cannot find xcb, albeit I installed every x11/xcb library I
can think of (to name them: libx11-xcb-dev:i386, libx11-xcb1:i386,
libx11-6:i386, libx11-dev:i386, xcb-proto:i386, xcb:i386, libxcb1:i386,
libxcb1-dev:i386).

I also tried the above steps on a Ubuntu 12.10 32bit VM with similar
results. Am I missing something? Do I need a special setup to compile a
CogVM? Any other ideas?

Thanks,
Philipp

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