1# This option enables LTO for stage4 and LTO for generators in stage3 with profiledbootstrap. 2# Otherwise, LTO is used in only stage3. 3 4STAGE3_CFLAGS += -flto=jobserver 5override STAGEtrain_CFLAGS := $(filter-out -flto=jobserver,$(STAGEtrain_CFLAGS)) 6STAGEtrain_GENERATOR_CFLAGS += -flto=jobserver 7STAGEfeedback_CFLAGS += -flto=jobserver 8 9# assumes the host supports the linker plugin 10LTO_AR = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ar$(exeext) -B$$r/$(HOST_SUBDIR)/prev-gcc/ 11LTO_RANLIB = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ranlib$(exeext) -B$$r/$(HOST_SUBDIR)/prev-gcc/ 12 13LTO_EXPORTS = AR="$(LTO_AR)"; export AR; \ 14 RANLIB="$(LTO_RANLIB)"; export RANLIB; 15LTO_FLAGS_TO_PASS = AR="$(LTO_AR)" RANLIB="$(LTO_RANLIB)" 16 17do-compare = /bin/true 18