Guest additions will not build using gcc 6

[tomasth]

See attached log. This is on a Ubuntu 1204 guest using gcc6 from ​https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test

Builds are OK using gcc5 from same source

[Valery Ushakov]

Your kernel doesn't provide compiler-gcc6.h header. Not much we can do about that.

[tomasth]

Replying to vushakov:

Your kernel doesn't provide compiler-gcc6.h header. Not much we can do about that.

Thanks, I didn't realize the headers were kernel-generated. Found this workaround suggestion ​https://stackoverflow.com/questions/29925513/compile-a-linux-2-6-kernel-module-with-newer-compiler but I guess it could be risky.