[RFA] load lipthread symbols even when auto-solib-add is off

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

Between having to document a side-effect of "set auto-solib-add 0"
and fixing the actual issue, I finally decided to try to fix the issue...
If you don't remember what the issue is, we started discussing it at:

        http://www.sourceware.org/ml/gdb/2006-09/msg00065.html

In short, when doing "set auto-solib-add 0", and then running
a multi-threaded program on x86-linux, the "thread" layer doesn't
get pushed on the target stack. I couldn't demonstrate a visibly
bad behavior with GDB from CVS, but with gdb-6.4, I get:

    (gdb) c
    Continuing.

    Program terminated with signal SIGTRAP, Trace/breakpoint trap.
    The program no longer exists.

After discussing this a bit with Daniel, we determined that we could
always load the symbols for libpthread. This is what this patch
implements.

2006-10-17  Joel Brobecker  <brobecker@adacore.com>

        * solib.c (libpthread_solib_p): New function.
        (solib_add): Always read the symbols from the libpthread library.

Tested on x86-linux, no regression. I verified that this also makes
GDB push the thread layer despite "set auto-solib-add 0".

Is this OK?

Thanks,
-- 
Joel

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