[PATCH] Enable ISL's small integer optimization

[Joerg Sonnenberger]

On Wed, Jun 17, 2015 at 11:47:27PM +0200, Michael Kruse wrote:
> My up-to-date Ubuntu 15.04 has gcc 4.9.2, which still requires
> -std=c99 or you get a link error (multiple definitions; debug builds
> only because gcc is very aggressive with inlining). gcc 5 changes the
> default to C11, but for know the build requirement for LLVM is only
> GCC 4.7 (http://llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library).

Not true, GCC 5 uses gnu11 as default. Which is the point, for GCC and
Clang, the choice if any should be gnu99.

Joerg