Did you even _think_ of looking at the sh configury, and do something vaguely similar for x86?
You should not duplicate t-linux64 at all. Instead, in config.gcc set m64/m32 as the default value for with_multilib_list on i386 biarch and x86_64. Pass $with_multilib_list to t-linux64 using TM_MULTILIB_CONFIG. Then, do something like comma=, MULTILIB_OPTIONS = $(subst $(comma),/,@TM_MULTILIB_CONFIG@) MULTILIB_DIRNAMES = $(patsubst m%, %, $(subst /, ,$(MULTILIB_OPTIONS))) MULTILIB_OSDIRNAMES = 64=../lib64 MULTILIB_OSDIRNAMES += 32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib) MULTILIB_OSDIRNAMES += x32=../libx32 in config/t-linux64. (Each on one line, apologies for any wrapping) The option will be used as --with-multilib-list=m64,m32,mx32 (allowing the user to omit some of the variants, too). Paolo
