Hi Andreas,
Well I can shed some light on how this problem is happening, although
not necessarily why:
de/dbt/simplelibclient/SimpleCPPLib.o:(.data.rel+0x68): undefined reference to
`hidden alias for de::dbt::simplelibclient::SimpleCPPLib::square(int)'
Looking at libSimpleCPPLib.so, where you would expect to find the
definition of the alias shows:
% nm -C SimpleCPPLib/Debug/libSimpleCPPLib.so | grep square
0000071c t hidden alias for
de::dbt::simplelibclient::SimpleCPPLib::square(int)
0000071c T de::dbt::simplelibclient::SimpleCPPLib::square(int)
The "t" is critical. It indicates that the hidden alias is local to the
file and not visible outside the library. Hence you are getting the
link-time error. Looking at the SimpleCPPLib.o file on its own, (ie not
inside the library) shows:
% nm -C SimpleCPPLib/Debug/SimpleCPPLib.o | grep square
00000000 T hidden alias for
de::dbt::simplelibclient::SimpleCPPLib::square(int)
00000000 T de::dbt::simplelibclient::SimpleCPPLib::square(int)
ie here the hidden alias is type "T", an exported text symbol. This
explains why you can link directly against the SimpleCPPLib.o file and
obtain a fully resolved executable.
I am not an expert on java, but it seems to me that you should not be
trying to reference the hidden alias at all, (after all it is hidden).
Instead SimpleLibClient/de/dbt/simplelibclient/SimpleCPPLib.o ought to
be referencing the unaliased symbol
[de::dbt::simplelibclient::SimpleCPPLib::square(int)] which *is*
exported from libSimpleCPPLib.so. So to me this implies that this is a
java compiler (gcj) problem.
If there is a good reason for referencing the hidden alias then the
problem is either that you should not be linking against the
libSimpleCPPLib.so library but instead linking against the object file,
or that the transformation of SimpleCPPLib.o into libSimpleCPPLib.so
should not be transforming the globally visible hidden alias into a
local-only hidden alias.
Cheers
Nick
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