--emit=bc generates bitcode that fails to compile using clang > 3.3

[Dominator008]

Reproducing would take some efforts, but the general problem is that clang complained about "invalid value" when reading the bitcode file. Clang 3.3 and some 3.4 version work fine. I'm not exactly sure how to debug this, nor that I'm sure it's a problem with rustc, but I guess it warrants an issue.

[alexcrichton]

The compiler is currently using LLVM 3.5-dev by default, so unless you're using HEAD clang the bytecode isn't guaranteed to be compatible.

[alexcrichton]

You can, however, compile rustc with an older LLVM if you desire bitcode compatibility

[Dominator008]

Confirmed that the bitcode compiles under HEAD clang. Thanks!

[alexcrichton]

Good to hear! I'm going to close this as intended behavior for now, but feel free to reopen if you run into more issues!