bootstrap fails while compiling gcc-4.9.4 packages from source on yakkety and later

On yakkety and zesty, trying to compile the gcc-4.9.4 packages from source will fail on bootstrap phase. This is because gccgo-4.9.4 will try to store non-zero values in .bss in the assembler source, and that will trigger an assembler error in binutils >= 2.27 provided with yakkety and zesty. The error is explained in binutils/gas/Changelog-2015 (search bss).
I didn't go further to see if other compilers from the gcc package will trigger this error, but it's possible as well (so far, g++, objc, objc++ and gcc itself do not).

I know that this is rather a gcc bug and the 4.9.4 is just a maintenance release, and the development of this version ceased; but there are still many apps out there requiring gcc-4.9. I think a patch to solve this would be more than useful.

Florin