http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57653
--- Comment #13 from Allan McRae <allan at archlinux dot org> --- The Arch gcc does the full bootstrap. The debug build I am using was compiled with DEBUG_CFLAGS="-g -fvar-tracking-assignments". The file "/usr/include/stdc-predef.h" is from glibc (v2.17 on Arch) and is specifically mentioned as being preincluded in http://gcc.gnu.org/gcc-4.8/porting_to.html. In fact, using -ffreestanding "solves" the issue.
