https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117771
--- Comment #3 from Edwin Lu <ewlu at rivosinc dot com> --- (In reply to Andrew Pinski from comment #2) > Created attachment 59699 [details] > Patch to test > > Can you test this patch? It moves the include of sstream above safe-ctype.h. > I don't know why it worked before; memory was included originally after > safe-ctype.h but now included before. I was able to build stage2 with gcc-9 with this patch applied. I've also been able to build stage1 with gcc-11 with no problems so far.