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Support slim LTO bootstrap

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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  <ak@linux.intel.com>

	* bootstrap-lto.mk: Implement slim bootstrap.

/:
2014-09-01  Andi Kleen  <ak@linux.intel.com>

	* Makefile.tpl (POSTSTAGE1_HOST_EXPORTS): Add LTO_EXPORTS.
	POSTSTAGE1_FLAGS_TO_PASS):  Add LTO_FLAGS_TO_PASS.
	* Makefile.in: Regenerate.

From-SVN: r214801
This commit is contained in:
Andi Kleen 2014-09-01 16:41:28 +00:00 committed by Andi Kleen
parent b5617e5f69
commit e04733ee53
5 changed files with 25 additions and 5 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2014-09-01 Andi Kleen <ak@linux.intel.com>
* Makefile.tpl (POSTSTAGE1_HOST_EXPORTS): Add LTO_EXPORTS.
POSTSTAGE1_FLAGS_TO_PASS): Add LTO_FLAGS_TO_PASS.
* Makefile.in: Regenerate.
2014-08-28 David Malcolm <dmalcolm@redhat.com>
* rtx-classes-status.txt: Delete

2
Makefile.in
View File

@ -257,6 +257,7 @@ POSTSTAGE1_HOST_EXPORTS = \
$(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CC; \
CC_FOR_BUILD="$$CC"; export CC_FOR_BUILD; \
$(POSTSTAGE1_CXX_EXPORT) \
$(LTO_EXPORTS) \
GNATBIND="$$r/$(HOST_SUBDIR)/prev-gcc/gnatbind"; export GNATBIND; \
LDFLAGS="$(POSTSTAGE1_LDFLAGS) $(BOOT_LDFLAGS)"; export LDFLAGS; \
HOST_LIBS="$(POSTSTAGE1_LIBS)"; export HOST_LIBS;
@ -828,6 +829,7 @@ POSTSTAGE1_FLAGS_TO_PASS = \
GNATBIND="$${GNATBIND}" \
LDFLAGS="$${LDFLAGS}" \
HOST_LIBS="$${HOST_LIBS}" \
$(LTO_FLAGS_TO_PASS) \
"`echo 'ADAFLAGS=$(BOOT_ADAFLAGS)' | sed -e s'/[^=][^=]*=$$/XFOO=/'`"
# Flags to pass down to makes which are built with the target environment.

2
Makefile.tpl
View File

@ -260,6 +260,7 @@ POSTSTAGE1_HOST_EXPORTS = \
$(XGCC_FLAGS_FOR_TARGET) $$TFLAGS"; export CC; \
CC_FOR_BUILD="$$CC"; export CC_FOR_BUILD; \
$(POSTSTAGE1_CXX_EXPORT) \
$(LTO_EXPORTS) \
GNATBIND="$$r/$(HOST_SUBDIR)/prev-gcc/gnatbind"; export GNATBIND; \
LDFLAGS="$(POSTSTAGE1_LDFLAGS) $(BOOT_LDFLAGS)"; export LDFLAGS; \
HOST_LIBS="$(POSTSTAGE1_LIBS)"; export HOST_LIBS;
@ -633,6 +634,7 @@ POSTSTAGE1_FLAGS_TO_PASS = \
GNATBIND="$${GNATBIND}" \
LDFLAGS="$${LDFLAGS}" \
HOST_LIBS="$${HOST_LIBS}" \
$(LTO_FLAGS_TO_PASS) \
"`echo 'ADAFLAGS=$(BOOT_ADAFLAGS)' | sed -e s'/[^=][^=]*=$$/XFOO=/'`"
# Flags to pass down to makes which are built with the target environment.

4
config/ChangeLog
View File

@ -1,3 +1,7 @@
2014-09-01 Andi Kleen <ak@linux.intel.com>
* bootstrap-lto.mk: Implement slim bootstrap.
2014-08-21 Bin Cheng <bin.cheng@arm.com>
* isl.m4 (ISL_CHECK_VERSION): Check link of isl library

16
config/bootstrap-lto.mk
View File

@ -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)"