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Re: Relocatable linking of weak symbols with LTO

OK, thanks.  I submitted bug 15323.

- Josh

On 3/29/13 12:25 PM, H.J. Lu wrote:
On Fri, Mar 29, 2013 at 11:54 AM, Joshua Conner <> 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
   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.

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