missing stderr?

[Christian Helmuth]

Hi Daniel,

thanks to your (admittedly) simple test case I could reproduce and
research into the issue (summary follows), which has nothing to do
with linking order as I guessed:

First, the 'stderr' symbol is private to the cxx library. This is by
intention, as we do not provide a POSIX environment with the Genode
base system, but have to make the G++ support library - libsupc++ -
happy.

Since 11.08, the dynamic linker does not export all symbols of any
library it is linked to to prevent some issues we had during
development. It rather uses a whitelist of global symbols that will be
exported in os/src/lib/ldso/symbol.map. Any other symbol will become
local.

Also, as I stated in the last email libstdc++ seems to include all
objects from libsupc++, effectively providing the same symbols but not
localized. Therefore, the linker does not nag about undefined
(localized) symbols from libsupc++(vterminate.o), but about the
consequential error of a missing 'stderr' needed by
libstdc++(vterminate.o).

The attached patch fixes the problem but is not approved by our
dynamic-linking specialist. As soon as he gives his nod, we'll commit
a solution into the public SVN and notify this list.

Regards
-- 
Christian Helmuth
Genode Labs

http://www.genode-labs.com/ · http://genode.org/ · /ˈdʒiː.nəʊd/

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
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