From 870e466f3853fb59faf1ad83465bedc4447240d1 Mon Sep 17 00:00:00 2001 From: ak Date: Mon, 1 Sep 2014 16:41:28 +0000 Subject: Support slim LTO bootstrap Change the bootstrap-lto config file to use slim (non fat) LTO.. Speeds up the LTO bootstrap by ~18% on a 4 core system. This requires using gcc-ar/ranlib in post stage 1 builds, so these are passed to all sub builds. config/: 2014-09-01 Andi Kleen * bootstrap-lto.mk: Implement slim bootstrap. /: 2014-09-01 Andi Kleen * Makefile.tpl (POSTSTAGE1_HOST_EXPORTS): Add LTO_EXPORTS. POSTSTAGE1_FLAGS_TO_PASS): Add LTO_FLAGS_TO_PASS. * Makefile.in: Regenerate. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214801 138bc75d-0d04-0410-961f-82ee72b054a4 --- config/ChangeLog | 4 ++++ config/bootstrap-lto.mk | 16 +++++++++++----- 2 files changed, 15 insertions(+), 5 deletions(-) (limited to 'config') diff --git a/config/ChangeLog b/config/ChangeLog index 82c73bd5cde..a1653c6328a 100644 --- a/config/ChangeLog +++ b/config/ChangeLog @@ -1,3 +1,7 @@ +2014-09-01 Andi Kleen + + * bootstrap-lto.mk: Implement slim bootstrap. + 2014-08-21 Bin Cheng * isl.m4 (ISL_CHECK_VERSION): Check link of isl library diff --git a/config/bootstrap-lto.mk b/config/bootstrap-lto.mk index 27bad1529be..9e065e1d85a 100644 --- a/config/bootstrap-lto.mk +++ b/config/bootstrap-lto.mk @@ -1,7 +1,13 @@ -# This option enables LTO for stage2 and stage3. -# FIXME: Our build system is not yet able to use gcc-ar wrapper, so we need -# to go with -ffat-lto-objects. +# This option enables LTO for stage2 and stage3 in slim mode -STAGE2_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects -STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1 -ffat-lto-objects +STAGE2_CFLAGS += -flto=jobserver -frandom-seed=1 +STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1 STAGEprofile_CFLAGS += -fno-lto + +# assumes the host supports the linker plugin +LTO_AR = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ar$(exeext) -B$$r/$(HOST_SUBDIR)/prev-gcc/ +LTO_RANLIB = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ranlib$(exeext) -B$$r/$(HOST_SUBDIR)/prev-gcc/ + +LTO_EXPORTS = AR="$(LTO_AR)"; export AR; \ + RANLIB="$(LTO_RANLIB)"; export RANLIB; +LTO_FLAGS_TO_PASS = AR="$(LTO_AR)" RANLIB="$(LTO_RANLIB)" -- cgit v1.2.1