[LLVMdev] Using thin archives when building llvm

[Rafael Espíndola]

On 17 July 2015 at 07:19, Brad King <brad.king at kitware.com> wrote:
> On 07/15/2015 09:00 PM, Rafael Espíndola wrote:
>> I have just committed support to llvm-ar for creating thin archives.
>> The idea of thin archives is that they contain just the symbol table
>> and the path to find the original .o files.
>
> Neat!  Is this expected to be used only for non-installed archives?

Yes, the idea is to speed up a regular development build.

>> Is there any way to do that with cmake without having to have a hacked
>> llvm-ar? All that is needed is for cmake to run
>>
>> .../llvm-ar cqT foo.a ....
>>
>> instead of
>>
>> .../llvm-ar cq foo.a ....
>
> CMake has undocumented variables set by the Modules/Platform/*
> files to specify the rules for creating archives.  These are:
>
>  CMAKE_<LANG>_ARCHIVE_{CREATE,APPEND,FINISH}

I went with this one on my run-cmake script, thanks.

Cheers,
Rafael