https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- Comment #252 from The Written Word <bugzilla-gcc at thewrittenword dot com> --- (In reply to Larkin Nickle from comment #249) > Then, if libcpp's Makefile is patched so that charset.c is built with -O1, I > eventually run into other errors: > > ../../../../sources/gcc-11.1.0-new/libgcc/libgcov-interface.c: In function > 'gcov_clear': > ../../../../sources/gcc-11.1.0-new/libgcc/libgcov-interface.c:143:1: > internal compiler error: Illegal instruction > 143 | } > | ^ > libbacktrace could not find executable to open I tried building 10.3.0 using the same patches as in 11.1.0 and ran into the above for the 10.3.0 build.