llvm dev - Jul 2015 - [LLVMdev] Using thin archives when building llvm

> The Modules/Platform/Windows-MSVC.cmake module unconditionally
> sets CMAKE_CXX_CREATE_STATIC_LIBRARY and uses CMAKE_LINKER.
> As mentioned earlier the CMAKE_<LANG>_CREATE_STATIC_LIBRARY
> and similar variables are internal implementation details
> that are not meant to be set by users or project code.  That
> is why the above works only on certain platforms.
>
> Will thin archive support be distributed as part of llvm-ar
> proper for general use or is this only for LLVM's own build?
> If it will be for general use then it may also be worthwhile
> teaching CMake this option directly.
It is generally useful. The gnu ar already supports it. The
implementation in llvm-ar is compatible with it.

Making it available in llvm-lib is an extension over lib.exe.

Cheers,
Rafael

> It is generally useful. The gnu ar already supports it. The
> implementation in llvm-ar is compatible with it.
>
> Making it available in llvm-lib is an extension over lib.exe.
I was able to get this to work on windows by using

-DCMAKE_STATIC_LINKER_FLAGS=/llvmlibthin

Thanks,
Rafael

> I was able to get this to work on windows by using
>
> -DCMAKE_STATIC_LINKER_FLAGS=/llvmlibthin
And with r242926 it looks like the new lld just works with thin
archives on windows :-)

Cheers,
Rafael