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A: Modular design. You can change everything, modify to make your own compiler and even include on a proprietary project if you want(license much more permissive than GPL)).

It lets you interpret C and C++, if you want.

It lets you compile in C, C++ to bytecode like java if you want, native code if you want too.

It can compile JIT fast things like OpenCL or javascript.

D: It is huge for a compiler. I believe gigabytes or so.

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I was a bit surprised by Stallman's statement

"One of our main goals for GCC is to prevent any parts of it from being used together with non-free software. Thus, we have deliberately avoided many things that might possibly have the effect of facilitating such usage"

Clang is not gigabytes big. Even the uncompressed source code for it and LLVM (which are very big) aren't in the gigabytes.

http://llvm.org/releases/download.html#3.0

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