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Relocatable linking of weak symbols with LTO

H.J. Lu hjl.tools@gmail.com
Fri Mar 29 19:26:00 GMT 2013 
On Fri, Mar 29, 2013 at 11:54 AM, Joshua Conner <jconner@nvidia.com> wrote:
> Hello -
>
> I have a weak function that is input to an incremental link with -flto -r.
>
> Then, when I re-link the output with another object file in which the same
> function is declared non-weak, I get an error message:
>
> `foo' referenced in section `.text.startup' of test-intermediate: defined in
> discarded section `.text' of test.o (symbol from plugin)
> collect2: error: ld returned 1 exit status
>
> Here's the command lines I'm executing:
>
>   gcc -flto -g -O2 -c -o test-weak.o test-weak.c # declares foo as weak
>   gcc -flto -g -O2 -c -o test.o test.c # declares foo, not as weak
>   gcc -flto -g -O2 -r -o test-intermediate test-weak.o -nostdlib
> -nostartfiles
>   gcc -flto -g -O2 -o test test-intermediate test.o
>
> I can work around this with -fno-use-linker-plugin, but I would like to get
> the benefit of whole-program optimization.  Is this just a limitation of the
> linker plugin, that once I perform an incremental link with a weak symbol I
> can't then try to overload it?
>
> Thanks for any insight you can provide -
>

Please open a binutils bug.


-- 
H.J.
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