[LLVMdev] 3.4 branch gcc 4.9 build error

[Holger Hoffstätte]

On Sun, 27 Apr 2014 16:18:52 +0200, Tuncer Ayaz wrote:

> 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).

Explained under "Header <cstddef> changes" in:
http://gcc.gnu.org/gcc-4.9/porting_to.html

-h