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[Bug gold/16417] executable linked with gold segfaults before main


From: amodra at gmail dot com
Subject: [Bug gold/16417] executable linked with gold segfaults before main
Date: Fri, 04 Apr 2014 03:45:31 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=16417

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |amodra at gmail dot com
         Resolution|WONTFIX                     |---

--- Comment #8 from Alan Modra <amodra at gmail dot com> ---
bfd ld behaviour with the testcase in comment #6 is a little weird, but I think
correct given the description of --as-needed.

On my x86_64 Ubuntu 12.04 box, it isn't __pthread_key_create that causes
libpthread to be seen as needed.  libpthread.so.0 is being included in the link
due to a strong reference in libstdc++.so.6 to address@hidden 
libpthread.so.0 defines a weak write@@GLIBC_2.2.5 so satisfies the --as-needed
requirement.

The order in which the libraries are linked, -lstdc++, -lpthread, -lc, means we
haven't seen the definition in libc.so.6 for "write" at the time we're checking
whether libpthread.so.6 is needed..  If I modify the order to -lstdc++, -lc,
-lpthread, -lc then libpthread is seen as not needed, and the resulting a.out
does not crash.

So I think Cary was a little hasty in closing this bug.

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