https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60818
--- Comment #25 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> --- Hi Segher! Your patch fixes the issue for me. I had issues building ghc on powerpcspe. With gcc-6 it failed in the expected way, with gcc-7, it went past the problematic source code file. Would it be possible that your backport your fix to the gcc-6 branch so we can use it in the current Debian release? Thanks, Adrian