[commit] Error while loading core file on mips-irix

[Joel Brobecker]

On mips-irix, GDB reports the following error while loading a core file:
 
    (gdb) core core 
    Reading symbols from /usr/lib32/libm.so...done.
    Loaded symbols for /usr/lib32/libm.so
    Reading symbols from /usr/lib32/libc.so.1...done.
    Loaded symbols for /usr/lib32/libc.so.1
    You can't do that without a process to debug.

This is a familiar issue, as we've seen thing before on other targets
(probably Tru64, for instance).
 
The problem is yet again in the irix_solib_create_inferior_hook,
where we try to resume the inferior execution in order to reach
the point where all shared libraries have been mapped.  This is not
necessary when debugging from a core file.  The error comes from
the fact that we attempt a "target_resume", which fails because
the "core" layer does cannot run/resume...

Fixed by simply doing nothing when debugging from a core file.
     
gdb/ChangeLog: 

        Error while loading core file on mips-irix. 
        * solib-irix.c (irix_solib_create_inferior_hook): Do nothing
        if debugging from a core file.

-- 
Joel
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