[Vm-dev] [commit][2661] Add yet another libc line to the linux
launch script(s), and try and make the
Eliot Miranda
eliot.miranda at gmail.com
Tue Jan 8 23:23:26 UTC 2013
Hi Bert,
its necessary because the VM and the image must use the same libc.so,
and to do that reliably one needs to specify a LD_LIBRARY_PATH that will
include the directory containing the actual libc.so in use by the VM first.
LD_LIBRARY_PATH may need to be set by the user, e.g. to pick up specific
versions of plugins or support libraries but if that LD_LIBRARY_PATH
doesn't include the right dir for libc then the image may load the wrong
libc and things will break. This is a real case that Cadence customers saw
in using a complex application that uses a number of C libraries. i.e.
even if my explanation sounds waffly there's actual experience behind it :)
On Tue, Jan 8, 2013 at 12:35 PM, Bert Freudenberg <bert at freudenbergs.de>wrote:
>
> Why is this even necessary? To look up libc functions we used to leave the
> module name empty in the FFI declaration, so it wouldn't ever need to know
> the exact location of libc. This used to end up in a dlopen() call with a
> null file name.
>
> - Bert -
>
>
> On 08.01.2013, at 11:57, commits at squeakvm.org wrote:
>
> >
> > Revision: 2661
> > Author: eliot
> > Date: 2013-01-08 11:57:41 -0800 (Tue, 08 Jan 2013)
> > Log Message:
> > -----------
> > Add yet another libc line to the linux launch script(s), and try and
> make the
> > script suggest users extend it themselves. you can lead a horse to
> water...
> > Rationalize the includes in sqUnixUUID.c.
> >
> > Modified Paths:
> > --------------
> > branches/Cog/platforms/unix/config/bin.squeak.sh.in
> > branches/Cog/platforms/unix/config/squeak.sh.in
> > branches/Cog/platforms/unix/plugins/UUIDPlugin/sqUnixUUID.c
> >
> > Property Changed:
> > ----------------
> > branches/Cog/platforms/Cross/vm/sqSCCSVersion.h
> >
> >
> > Property changes on: branches/Cog/platforms/Cross/vm/sqSCCSVersion.h
> > ___________________________________________________________________
> > Modified: checkindate
> > - Mon Jan 7 13:52:47 PST 2013
> > + Tue Jan 8 11:56:08 PST 2013
> >
> > Modified: branches/Cog/platforms/unix/config/bin.squeak.sh.in
> > ===================================================================
> > --- branches/Cog/platforms/unix/config/bin.squeak.sh.in
> 2013-01-07 21:54:37 UTC (rev 2660)
> > +++ branches/Cog/platforms/unix/config/bin.squeak.sh.in
> 2013-01-08 19:57:41 UTC (rev 2661)
> > @@ -14,15 +14,18 @@
> > # libc (e.g. through the FFI) then it must use the same version that the
> VM uses
> > # and so it should take precedence over /lib libc. This is done by
> setting
> > # LD_LIBRARY_PATH appropriately, based on ldd's idea of the libc use by
> the VM.
> > -case `/usr/bin/ldd "$BIN/squeak" | /bin/fgrep /libc. | sed 's/^.*=>
> //'` in
> > +LIBC_SO="`/usr/bin/ldd "$BIN/squeak" | /bin/fgrep /libc. | sed 's/^.*=>
> //'`"
> > +case "$LIBC_SO" in
> > /lib/libc*) SVMLLP="/lib:/usr/lib";;
> > /lib32/libc*) SVMLLP="/lib32:/usr/lib32";;
> > /lib64/libc*) SVMLLP="/lib64:/usr/lib64";;
> > /lib/tls/libc*)
> SVMLLP="/lib/tls:/lib:/usr/lib/tls:/usr/lib";;
> > /lib/i386-linux-gnu/libc*) \
> > - SVMLLP="/lib/i386-linux-gnu:/usr/lib/i386-linux-gnu";;
> > +
> SVMLLP="/lib/i386-linux-gnu:/lib:/usr/lib/i386-linux-gnu:/usr/lib";;
> > /lib/tls/i686/cmov/libc*) \
> > SVMLLP="/lib/tls/i686/cmov:/lib:/usr/lib/tls/i686/cmov:/usr/lib";;
> > +/lib/386-linux-gnu/i686/cmov/libc*) \
> > +
> SVMLLP="/lib/386-linux-gnu/i686/cmov:/lib:/usr/lib/386-linux-gnu/i686/cmov:/usr/lib";;
> > /lib/tls/i686/nosegneg/libc*) \
> >
> SVMLLP="/lib/i686/nosegneg/tls:/lib:/usr/lib/i686/nosegneg/tls:/usr/lib";;
> > "") case `/bin/uname -m || /usr/bin/uname -m` in
> > @@ -30,7 +33,7 @@
> > *) echo "/usr/bin/ldd didn't produce any output. Can't infer
> base LD_LIBRARY_PATH. Aborting." 1>&2
> > esac
> > exit 1;;
> > -*) echo "Can't infer base LD_LIBRARY_PATH. Aborting." 1>&2
> > +*) echo "Can't infer base LD_LIBRARY_PATH. Aborting. Try adding a
> line for $LIBC_SO to $0. Please report your edit to squeak vm-dev." 1>&2
> > exit 1
> > esac
> > # prepending is less flexible but safer because it ensures we find the
> plugins
> >
> > Modified: branches/Cog/platforms/unix/config/squeak.sh.in
> > ===================================================================
> > --- branches/Cog/platforms/unix/config/squeak.sh.in 2013-01-07
> 21:54:37 UTC (rev 2660)
> > +++ branches/Cog/platforms/unix/config/squeak.sh.in 2013-01-08
> 19:57:41 UTC (rev 2661)
> > @@ -14,15 +14,18 @@
> > # libc (e.g. through the FFI) then it must use the same version that the
> VM uses
> > # and so it should take precedence over /lib libc. This is done by
> setting
> > # LD_LIBRARY_PATH appropriately, based on ldd's idea of the libc use by
> the VM.
> > -case `/usr/bin/ldd "$BIN/squeak" | /bin/fgrep /libc. | sed 's/^.*=>
> //'` in
> > +LIBC_SO="`/usr/bin/ldd "$BIN/squeak" | /bin/fgrep /libc. | sed 's/^.*=>
> //'`"
> > +case "$LIBC_SO" in
> > /lib/libc*) SVMLLP="/lib:/usr/lib";;
> > /lib32/libc*) SVMLLP="/lib32:/usr/lib32";;
> > /lib64/libc*) SVMLLP="/lib64:/usr/lib64";;
> > /lib/tls/libc*)
> SVMLLP="/lib/tls:/lib:/usr/lib/tls:/usr/lib";;
> > /lib/i386-linux-gnu/libc*) \
> > - SVMLLP="/lib/i386-linux-gnu:/usr/lib/i386-linux-gnu";;
> > +
> SVMLLP="/lib/i386-linux-gnu:/lib:/usr/lib/i386-linux-gnu:/usr/lib";;
> > /lib/tls/i686/cmov/libc*) \
> > SVMLLP="/lib/tls/i686/cmov:/lib:/usr/lib/tls/i686/cmov:/usr/lib";;
> > +/lib/386-linux-gnu/i686/cmov/libc*) \
> > +
> SVMLLP="/lib/386-linux-gnu/i686/cmov:/lib:/usr/lib/386-linux-gnu/i686/cmov:/usr/lib";;
> > /lib/tls/i686/nosegneg/libc*) \
> >
> SVMLLP="/lib/i686/nosegneg/tls:/lib:/usr/lib/i686/nosegneg/tls:/usr/lib";;
> > "") case `/bin/uname -m || /usr/bin/uname -m` in
> > @@ -30,7 +33,7 @@
> > *) echo "/usr/bin/ldd didn't produce any output. Can't infer
> base LD_LIBRARY_PATH. Aborting." 1>&2
> > esac
> > exit 1;;
> > -*) echo "Can't infer base LD_LIBRARY_PATH. Aborting." 1>&2
> > +*) echo "Can't infer base LD_LIBRARY_PATH. Aborting. Try adding a
> line for $LIBC_SO to $0. Please report your edit to squeak vm-dev." 1>&2
> > exit 1
> > esac
> > # prepending is less flexible but safer because it ensures we find the
> plugins
> >
> > Modified: branches/Cog/platforms/unix/plugins/UUIDPlugin/sqUnixUUID.c
> > ===================================================================
> > --- branches/Cog/platforms/unix/plugins/UUIDPlugin/sqUnixUUID.c
> 2013-01-07 21:54:37 UTC (rev 2660)
> > +++ branches/Cog/platforms/unix/plugins/UUIDPlugin/sqUnixUUID.c
> 2013-01-08 19:57:41 UTC (rev 2661)
> > @@ -3,12 +3,12 @@
> > #if defined(HAVE_SYS_UUID_H)
> > # include <sys/types.h>
> > # include <sys/uuid.h>
> > -#endif
> > -#if defined(HAVE_UUID_UUID_H)
> > +#elif defined(HAVE_UUID_UUID_H)
> > # include <uuid/uuid.h>
> > -#endif
> > -#if defined(HAVE_UUID_H)
> > +#elif defined(HAVE_UUID_H)
> > # include <uuid.h>
> > +#else
> > +# error cannot find a uuid.h to include
> > #endif
> >
> > #include "sq.h"
> >
>
>
--
best,
Eliot
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