в апреле вышла 2.7
в блоге писали о целях для релиза 2.8впрочем вот что вышло
# The MachO file format support is now fully functional and works.
# The MC disassembler now fully supports ARM and Thumb. ARM assembler support is still in early development though.
# The X86 MC assembler now supports the X86 AES and AVX instruction set.
# Work on ELF and COFF object files and ARM target support is well underway, but isn't useful yet in LLVM 2.8. Please contact the llvmdev mailing list if you're interested in this.
т.е. поддержка разных платформ у них сколько-нибудь реализована
хотя о поддержке чего-то кроме darwin не заявлено
The MC subproject has made great leaps in LLVM 2.8. For example, support for directly writing .o files from LLC (and clang) now works reliably for darwin/x86[-64] (including inline assembly support) and the integrated assembler is turned on by default in Clang for these targets. This provides improved compile times among other things.