Re: problem with dynamic_cast

[Chris Faylor <cgf@cygnus.com>]

On Fri, Sep 08, 2000 at 11:00:49PM -0400, Chris Faylor wrote:
>On Fri, Sep 08, 2000 at 12:46:31PM -0400, Chris Faylor wrote:
>>On Fri, Sep 08, 2000 at 10:18:42AM -0400, Fleischer, Karsten (K.) wrote:
>>>How about including the stub libraries in the distribution, rather than the
>>>symlinks?
>>
>>The reason for the symlinks is that some packages search libc.a and libm.a
>>for symbols.
>>
>>If linking libc.a twice causes problems, then it *is* a bug in either gcc or
>>ld.
>>
>>Mumit had vowed once to fix this problem but then he disappeared...
>
>Ok, I looked into this.  It is a linker problem.  Specifying -lm or -lc on
>the command line causes ld to put symbols into the import section in improperly
>sorted order.
>
>This confuses the Windows "dynamic loader" (and I use the term loosely) so that
>certain function calls (namely strcmp and strlen) are not resolved.  So when
>a function in libgcc needs to call strcmp it ends up jumping into unallocated
>memory, causing a SIGSEGV.
>
>That's the analysis.  I have no idea how to fix this, but I've sent some details
>to DJ in the hopes that he'll be able to do something about this.

FYI, DJ has checked in fixes for this into the latest binutils.

I'll probably provide an experimental binutils version in the next couple of
days.

cgf

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