[LLVMdev] 3.4 branch gcc 4.9 build error

[Tuncer Ayaz]

Using gcc 4.9 to build the llvm 3.4 branch fails with the following error:

llvm[1]: Compiling APFloat.cpp for Release build
[...]
/usr/lib64/gcc/x86_64-unknown-linux-gnu/4.9.0/../../../../include/c++/4.9.0/cstddef:51:11:
error: no member named 'max_align_t' in the global namespace
  using ::max_align_t;
        ~~^

gcc 4.8.2's caused no such issue, so it must be a change in 4.9.0/cstddef.

To be clear, I have no idea who's at fault (gcc 4.9.0 header or llvm sources),
assuming any code is to be blamed (at all).