https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82686
--- Comment #13 from Dennis Clarke <dclarke at blastwave dot org> --- Finally managed to get a decent looking three stage bootstrap to complete without bizarre errors. Thanks to Matthias Klose for the suggestion to get away from that gc issue entirely. Testsuite is running however I am not thrilled with what I see : === gcc Summary === # of expected passes 112961 # of unexpected failures 910 # of unexpected successes 22 # of expected failures 347 # of unresolved testcases 1 # of unsupported tests 2794 /usr/local/build/gcc-7.3.0_linux_4.15.0-2-powerpc64_ppc64.005/gcc/xgcc version 7.3.0 (genunix Mon Apr 16 00:04:56 GMT 2018) I'll followup with the libquadmath issues that may yet exist. Not sure yet. Dennis