https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83308
--- Comment #11 from Ian Lance Taylor <ian at airs dot com> --- As far as I know libbacktrace and libgo use the same criteria for whether they are built or not. Why is libbacktrace not being built for m4-fpu? What is preventing that build from occurring? What is the value of TIOCGWINSZ on SH? What is the output of grep TIOCGWINSZ TARGET/libgo/sysinfo.go ?