[llvm-dev] linkonce_odr & coff

[Sean Silva via llvm-dev]

On Wed, Jun 1, 2016 at 9:14 AM, Reid Kleckner via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Use comdats. linkonce_odr no longer implicitly creates comdats on COFF:
>   if (!Triple.isOSBinFormatMachO())
>

David recently added Triple.supportsCOMDAT() which makes the intent a bit
clearer.

-- Sean Silva


>     GV->setComdat(MyModule.getOrInsertComdat(GV->getName()));
>
> I think the same is true for ELF, but linkonce_odr gives things weak
> linkage in addition to making them comdat.
>
> On Wed, Jun 1, 2016 at 9:06 AM, Carlo Kok via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> I have @_rtti_a_a = linkonce_odr constant in two files that end up as
>> coff object files. Shoudln't the linkonce_odr prevent duplicate symbol:
>> __rtti_a_a \consoleapplication149.o and __rtti_a_a island.lib(island.o)
>> from happening in LLD?
>>
>> If not what alternative can I use? THis is used for template like
>> generics, so having duplicate functions and globals is going to happen a
>> lot)
>>
>> (Side note: How do I see linkonce* when dumping object files?)
>> --
>> Carlo Kok
>> RemObjects Software
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>> llvm-dev at lists.llvm.org
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>>
>
>
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