Re: [RFC PATCH] Don't use ELF weak for entities with vague linkage when COMDAT groups are available

[Daniel Jacobowitz <drow at false dot org>]

On Thu, Apr 14, 2005 at 01:27:57PM -0700, Mark Mitchell wrote:
> Julian Brown wrote:
> 
> >I have tried the building a gcc on x86-64 with the vanilla binutils from 
> >SuSE 9.2 built from source, and it doesn't exhibit this problem. With 
> >SuSE patches applied, the build fails for for me (on a non-SuSE system). 
> >So in this case, the problem would appear to be one of the SuSE patches.
> 
> It sounds like we need an autoconf test.  That's going to be a bit of a 
> pain, in that I guess we need to both assemble and link something.
> 
> We could do:
> 
>   as -o conftest.o conftest.s
>   ld -r -o /dev/null conftest.o conftest.o
> 
> to make sure that COMDAT works.  But, the linker warnings Diego is 
> seeing probably wouldn't show up, as that only happens when symbols have 
> different sizes in the two object files.

A multi-file autoconf test is not particularly hard to arrange.  I
think we should make a solid effort to have this work by default...

-- 
Daniel Jacobowitz
CodeSourcery, LLC