[cfe-dev] Clang versus GCC speed

[Douglas Gregor]

On Nov 20, 2009, at 10:36 AM, David Chisnall wrote:
> Has anyone done any tests comparing gcc compilation speed to clang
> recently?

Yes.

>  I just did some tests with Objective-C programs and found
> clang much slower than GCC 4.2, with an optimized build of LLVM and
> Clang and a stock build of GCC.


This isn't what we're seeing. We're seeing Clang being consistently  
faster than GCC 4.2.

Are you certain that you built LLVM and Clang in Release-Asserts?  
Debug builds are horribly slow, and Release builds are still a bit  
slower than Release-Asserts builds.

	- Doug