Clang

[Borneq]

In new Code::Blocks is possibility to use Clang?

[anotherOpenGLFan]

No. Clang is not a supported compiler in Code::Blocks 12.11, However you can run Clang
like MinGW. So you can build with Clang, Even if Code::Blocks thinks it's using MinGW.
Fallowing the instructions in this stack-overflow answer: http://stackoverflow.com/questions/14419168/using-clang-with-codeblocks-on-windows-7
you can set it up to do just that.

You can change around what compiling executables are used by going to "Settings->Compiler...->Toolchain Executables",
when you get to that part of his answer.

[oBFusCATed]

Or you can try a nightly build, where it is supported.