[LLVMdev] getting gold plugin to work?

[Viktor Kutuzov]

> I'd expect that gold will need an option that tells it that some
> following option or options are to be passed to the plugin. The plugin
> API will need to pass these flags down.

This is already in place. Linker command line options could look like

-plugin pathname [ -plugin-opt arg1 ] [ -plugin-opt arg2 ] ... 

gold will load plug-in by pathname and pass to it the arguments arg1, arg2, etc. in the same order in which they appear on the command line.

-Viktor

________________________________________
From: llvmdev-bounces at cs.uiuc.edu [llvmdev-bounces at cs.uiuc.edu] On Behalf Of Sandeep Patel [deeppatel1987 at gmail.com]
Sent: Monday, October 05, 2009 1:21 PM
To: Rafael Espindola
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] getting gold plugin to work?

On Mon, Oct 5, 2009 at 8:04 PM, Rafael Espindola <espindola at google.com> wrote:
>> I have no idea how to reduce this.
>>
>> Configure llvm-gcc for "arm-eabi" and use "--with-cpu=cortex-a8
>> --with-fpu=neon --with-abi=aapcs --with-float=hard". The triple in the
>> bitcode will be "armv7-eabi" but the actual CPU subtarget won't be
>> known to the gold plugin. I'd think the same would be true for any
>> cross-compiler. Note that self-hosting X86 will eventually use a CPUID
>> instruction to determine the proper subtarget on the fly so it will
>> usually be correct.
>
> I will try to take a look, but it will take some time.

If we can decide the way we want the options passed, I can take a stab
at it (or more likely Viktor will).

I'd expect that gold will need an option that tells it that some
following option or options are to be passed to the plugin. The plugin
API will need to pass these flags down. Any suggestions here that
would be compatible with the FSF view of the universe would be
welcome.

I assume the plugin's options should be either the existing cl::opt
ones (-mcpu, etc.) or similar to the llc ones.

deep
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