https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85114
--- Comment #4 from Thomas Klausner <tk at giga dot or.at> --- Thank you for looking at this. Yes, there are quite a number of changes in NetBSD's gcc: http://danbala.tuwien.ac.at/~wiz/tmp/netbsd.gcc-6.4.0.diff.gz (created by: cd /usr/src/external/gpl3/gcc/dist cvs diff -kk -rgcc-6-4-0) The corresponding cvsweb path is: http://cvsweb.netbsd.org/bsdweb.cgi/src/external/gpl3/gcc/dist/?only_with_tag=MAIN if you want to investigate the reason for particular changes. In addition, there is a separate build system used. You can find the Makefiles at http://cvsweb.netbsd.org/bsdweb.cgi/src/external/gpl3/gcc/?only_with_tag=MAIN and below the lib and usr.bin directories.
