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RFH: libgcc_s.so being unnecessarily linked for mipsel-linux cross compiler...

James E Wilson wilson@specifix.com
Thu Jul 28 21:26:00 GMT 2005 
On Thu, 2005-07-28 at 12:48, David Daney wrote:
> Also you can see that neither hello-world.o nor my libc-2.3.3.so have 
> any undefined symbols that would be satisfied by libgcc_s.so.

It looks like you forgot to check the crt*.o files for undefined
references.

If the gcc/glibc toolchain wasn't built the optimal way, it is possible
for crtbegin.o to have register_frame_info and deregister_frame_info
calls for C++ EH unwinding which would require libgcc always.

If built the optimal way, then the gcc/glibc toolchain will use an
alternate method for C++ EH unwinding that does not require crtbegin.o
support and hence does not require libgcc.  This is why the x86 FC3 is
OK.

See the USE_PT_GNU_EH_FRAME stuff in gcc/crtstuff.c.
-- 
Jim Wilson, GNU Tools Support, http://www.specifix.com
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