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[Bug ld/14915] --copy-dt-needed-entries not working

From: matz at suse dot de
Subject: [Bug ld/14915] --copy-dt-needed-entries not working
Date: Tue, 04 Dec 2012 14:06:26 +0000


Michael Matz <matz at suse dot de> changed:

           What    |Removed                     |Added
                 CC|                            |matz at suse dot de

--- Comment #1 from Michael Matz <matz at suse dot de> 2012-12-04 14:06:26 UTC 
Behaviour also doesn't change if we include objects that refer to stuff from
libm or libt1 into libt2.  I tried to debug ld a bit to see where this is
supposed to be handled but got lost after two hours.  It seems that some
handling of dt_needed entries in elf32.xm:gld*_after_open is only done
for executables, but even creating an executable doesn't help.

In any case, I couldn't find any code that really tries to add DT_NEEDED
entries from referred libraries to the output file.  The code in
elflink.c:elf_link_add_object_symbols at least only adds to the htab->needed
list on those entries (and 'libm.so.6' is included there), but doesn't actually
call elf_add_dt_needed_tag on those entries (and nobody else does

It certainly doesn't work as documented or expected (with my expectations).

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