[cfe-dev] Using Clang -O4 with CMake

[Rafael Espindola]

> You can add -emit-llvm to your CFLAGS, then use llvm-link to link the resulting bitcode files together, use opt to produce an optimised version, and then llc to generate the native code, which you then pass to the linker.  It's a bit more effort (and involves spawning a lot of processes, so will be slower), but should have the same end result.


One thing that is different is that gold (or the Apple linker) knows
what symbols are used and can optimize:

http://llvm.org/releases/2.6/docs/LinkTimeOptimization.html

> David
>
> -- Sent from my IBM 1620
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Cheers,
-- 
Rafael Ávila de Espíndola