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build system: Split linking into multiple steps 

After collecting dependencies for ramstage, add an intermediate step
in which object files are linked per directory. The results are then
linked into the final binary.

This reduces the maximum command line length and might also help with
future use of LTO linking.

Also adapt the lint test for build dir handling, since printall
doesn't provide individual object files for ramstage anymore.

Change-Id: Ie40febd8c1eaf4609944eedeab46d870639e53df
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/1911
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Patrick Georgi 2012-11-25 17:10:47 +01:00
parent 79f9010e80
commit f33e395213
2 changed files with 38 additions and 4 deletions
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34
Makefile.inc
View File

@ -60,6 +60,40 @@ subdirs-y += site-local
# Add source classes and their build options # Add source classes and their build options
classes-y := ramstage romstage smm cpu_microcode classes-y := ramstage romstage smm cpu_microcode
#######################################################################
# Helper functions for ramstage postprocess
spc :=
spc +=
$(spc) :=
$(spc) +=
# files-in-dir-recursive,dir,files
files-in-dir-recursive=$(filter $(1)%,$(2))
# parent-dir,dir/
parent-dir=$(dir $(subst $( ),/,$(strip $(subst /, ,$(1)))))
# filters out exactly the directory specified
# filter-out-dir,dir_to_keep,dirs
filter-out-dir=$(filter-out $(1),$(2))
# filters out dir_to_keep and all its parents
# filter-out-dirs,dir_to_keep,dirs
filter-out-dirs=$(if $(filter-out ./,$(1)),$(call filter-out-dirs,$(call parent-dir,$(1)),$(call filter-out-dir,$(1),$(2))),$(call filter-out-dir,$(1),$(2)))
# dir-wildcards,dirs
dir-wildcards=$(addsuffix %,$(1))
# files-in-dir,dir,files
files-in-dir=$(filter-out $(call dir-wildcards,$(call filter-out-dirs,$(1),$(dir $(2)))),$(call files-in-dir-recursive,$(1),$(2)))
#######################################################################
# reduce command line length by linking the objects of each
# directory into an intermediate file
ramstage-postprocess=$(foreach d,$(sort $(dir $(1))), \
$(eval $(d)ramstage.o: $(call files-in-dir,$(d),$(1)); $$(LD) -o $$@ -r $$^ ) \
$(eval ramstage-objs:=$(d)ramstage.o $(filter-out $(call files-in-dir,$(d),$(1)),$(ramstage-objs))))
romstage-c-ccopts:=-D__PRE_RAM__ romstage-c-ccopts:=-D__PRE_RAM__
romstage-S-ccopts:=-D__PRE_RAM__ romstage-S-ccopts:=-D__PRE_RAM__
ifeq ($(CONFIG_TRACE),y) ifeq ($(CONFIG_TRACE),y)

8
util/lint/lint-stable-002-build-dir-handling
View File

@ -61,10 +61,10 @@ $MAKE DOTCONFIG=$TMPCONFIG allyesconfig >/dev/null
CURRENTDIR=`pwd -P` CURRENTDIR=`pwd -P`
PARENTDIR=`dirname $CURRENTDIR` PARENTDIR=`dirname $CURRENTDIR`
compare_output "`run_printall build`" "build/.../static.c build/.../static.c build/.../static.ramstage.o build/.../static.romstage.o" compare_output "`run_printall build`" "build/.../static.c build/.../static.c build/.../static.romstage.o"
compare_output "`run_printall ../obj`" "$PARENTDIR/obj/.../static.c $PARENTDIR/obj/.../static.c $PARENTDIR/obj/.../static.ramstage.o $PARENTDIR/obj/.../static.romstage.o" compare_output "`run_printall ../obj`" "$PARENTDIR/obj/.../static.c $PARENTDIR/obj/.../static.c $PARENTDIR/obj/.../static.romstage.o"
compare_output "`run_printall /tmp`" "/tmp/.../static.c /tmp/.../static.c /tmp/.../static.ramstage.o /tmp/.../static.romstage.o" compare_output "`run_printall /tmp`" "/tmp/.../static.c /tmp/.../static.c /tmp/.../static.romstage.o"
compare_output "`run_printall /../tmp`" "/tmp/.../static.c /tmp/.../static.c /tmp/.../static.ramstage.o /tmp/.../static.romstage.o" compare_output "`run_printall /../tmp`" "/tmp/.../static.c /tmp/.../static.c /tmp/.../static.romstage.o"
rm -f $TMPCONFIG rm -f $TMPCONFIG