https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68126
--- Comment #2 from Hu Liang <hl8765 at 163 dot com> --- (In reply to Steve Ellcey from comment #1) > It looks like this is actually a bug in the GCC 4.4.7 compiler on the system > where you are building GCC. gensupport.c is compiled with the system > compiler in order to build gensupport which is run as part of the build. > Your best bet would be to do the build with a newer system compiler if you > have one. I just want to update the GCC compiler from GCC 4.4.7 to GCC 4.9.2