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 write@GLIBC_2.2.5.
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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