[LLVMdev] llvm-link deprecated in favor of gold plugin?

[Rafael Espíndola]

llvm-link and llvm-lto are developer tools. They exist only as a way
of making portable tests easy to write.

On 10 February 2015 at 13:20, Russell Wallace <russell.wallace at gmail.com> wrote:
> Ah, so the gold plugin does use the same Linker class as the other tools, so
> that code should be considered current and actively maintained? Thanks.
>
> I tried my test case just now with llvm-link on Linux and it worked
> correctly, so I'm guessing there's a bug in the way the Linker class works
> on Windows.
>
> On Tue, Feb 10, 2015 at 5:09 PM, Teresa Johnson <tejohnson at google.com>
> wrote:
>>
>> I don't recall hitting that but I am using a modified version of
>> llvm-lto and the linking code to work on an LTO-related prototype (I
>> find llvm-lto is easier than using the linker plugin for testing). My
>> source code bits are also a little stale though.
>>
>> But llvm-lto is generally just a wrapper around the code that does the
>> linking, which is shared with the gold plugin, and is where that
>> assert comes from. So I am not sure why it would give an error like
>> that assuming these are the same bitcode files you can successfully
>> feed into an LTO link using gold.
>>
>> Teresa
>>
>> On Tue, Feb 10, 2015 at 8:58 AM, Russell Wallace
>> <russell.wallace at gmail.com> wrote:
>> > Ah! Okay. A quick test of llvm-lto gets an error:
>> >
>> > llvm-lto: error adding file 'main.bc': Linking COMDATs named '
>> > ??_7_Iostream_error_category at std@@6B@': invalid selection kinds!
>> >
>> > Would it be the case that llvm-lto is also deprecated in favor of the
>> > gold
>> > plugin?
>> >
>> > On Tue, Feb 10, 2015 at 4:47 PM, Teresa Johnson <tejohnson at google.com>
>> > wrote:
>> >>
>> >> LTOCodeGenerator is used by the llvm-lto tool, which is a standalone
>> >> tool for doing LTO links.
>> >>
>> >> Teresa
>> >>
>> >> On Tue, Feb 10, 2015 at 8:37 AM, Russell Wallace
>> >> <russell.wallace at gmail.com> wrote:
>> >> > Following on from my last question, based on such information as I've
>> >> > been
>> >> > able to find on Google, I get the impression llvm-link is effectively
>> >> > deprecated / not actively maintained, because the focus of
>> >> > whole-program
>> >> > optimization is now on the gold plugin. Is that the case, or am I
>> >> > missing
>> >> > something?
>> >> >
>> >> > Running searches over the source tree, it seems the Linker class that
>> >> > actually implements the functionality of llvm-link is not used by any
>> >> > other
>> >> > modules except LTOCodeGenerator. I couldn't find anything referencing
>> >> > LTOCodeGenerator. Does the gold plugin or anything else use
>> >> > LTOCodeGenerator?
>> >> >
>> >> > _______________________________________________
>> >> > LLVM Developers mailing list
>> >> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> >> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Teresa Johnson | Software Engineer | tejohnson at google.com |
>> >> 408-460-2413
>> >
>> >
>>
>>
>>
>> --
>> Teresa Johnson | Software Engineer | tejohnson at google.com | 408-460-2413
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>