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(libtool.info)Multiple dependencies

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Multiple dependencies
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   On most modern platforms the order that dependent libraries are
listed has no effect on object generation.  In theory, there are
platforms which require libraries which provide missing symbols to
other libraries to listed after those libraries whose symbols they
provide.

   Particularly, if a pair of static archives each resolve some of the
other's symbols, it might be necessary to list one of those archives
both before and after the other one.  Libtool does not currently cope
with this situation well, since dupicate libraries are removed from the
link line by default.  Libtool provides the command line option
`--preserve-dup-deps' to preserve all duplicate dependencies in cases
where it is necessary.