libgcc_s : What links to it and why?

Ian Lance Taylor iant@google.com
Thu Nov 2 17:06:00 GMT 2006


Jeff Blaine <jblaine@mitre.org> writes:

> Hi Ian, thanks for the reply.
> 
> >> I didn't get an answer to my previous long post about the
> >> problem I am having, so I figured I would try asking
> >> more direct questions:
> >>
> >> What, in GCC, makes the determination to link in -lgcc?
> > -lgcc is always linked in.
> > I assume you are asking: what decides whether to link it statically
> > or
> > dynamically?  That is controlled by the -static-libgcc and
> > -shared-libgcc options, q.v.
> 
> I forgot to mention this below -- I also tried LDFLAGS="-static-libgcc"
> and watched it be referenced/used during my build.  It did nothing.
> The resulting build had libgcc_s.so linked.

I have no explanation for this behaviour.  If you run the link command
using the -v option, does it pass -lgcc_s to the linker?  Is there any
chance that you somewhere have a file named libgcc.so?  (You should
normally have libgcc.a and libgcc_s.so).

Ian



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