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ltdl weirdness

From: Matěj Týč
Subject: ltdl weirdness
Date: Mon, 23 Feb 2009 15:56:00 +0100

Hello all,
I am using libltdl in my project and I experience some unexpected things.

First of all, if I have some undefined references in my module, the
module can't be loaded using lt_dlopen neither using its ext variant.
The reason for that is stated as "could not find the file", but this
is not the case. If I correct those undefined references, everything
statrts to work. BTW the 'dltest' tool had helped me, although it is a
pity that it doesn't support loading symbols from executables that
would load the module.

Next, if the executable is compiled with -export-dynamic, things that
were compiled in really provide symbols that would be missing in the
module. However, things that were linked in as external libs don't
seem to be exported. Is this expected behaviour? However, there is a
difference between having nothing and between having linked external
symbols in executable compiled using -export-dynamic flag -- the first
case results in the inability to open the module (see the first
problem), whereas the latter results in runtime error.
Any suggestions regarding good practices?

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