https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- Comment #81 from EML <elowe at elowe dot com> --- Correction My make line is: make STAGE1_CFLAGS="-O0 -g -D_XOPEN_SOURCE_EXTENDED" STAGE1_CXXFLAGS="-O0 -g -D_XOPEN_SOURCE_EXTENDED" CFLAGS_FOR_TARGET="-O0 -g -D_XOPEN_SOURCE_EXTENDED" STAGE1_TFLAGS="-O0 -g -D_XOPEN_SOURCE_EXTENDED" BOOT_CFLAGS="-D_XOPEN_SOURCE_EXTENDED" LDFLAGS="-Wl,+allowdups" (allowdups to work around the duplicate symbols)