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[build] Properly handle multiple goals per BIN directory 

When building multiple targets per BIN with multiple jobs, for
example:

  make -j16 bin-i386-efi/ipxe.efi{,drv,rom} bin-x86_64-efi/ipxe.efi{,drv,rom}

we would invoke a make subprocess for each goal in parallel resulting
in multiple makes running in a single BIN directory.  Fix by grouping
goals per BIN directory and invoking only one make per BIN.  It is
both safer and faster.

Signed-off-by: Piotr Jaroszyński <p.jaroszynski@gmail.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1/head
Piotr Jaroszyński 2010-07-29 15:17:30 +02:00 committed by Michael Brown
parent 6142b721bf
commit 2d98d4a018
2 changed files with 17 additions and 6 deletions
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1
src/Makefile
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@ -21,6 +21,7 @@ CP := cp
ECHO := echo
PRINTF := printf
PERL := perl
TRUE := true
CC := $(CROSS_COMPILE)gcc
CPP := $(CC) -E
AS := $(CROSS_COMPILE)as

22
src/Makefile.housekeeping
View File

@ -174,8 +174,9 @@ endif
# make goals.
#
BIN_GOALS := $(filter bin/% bin-%,$(MAKECMDGOALS))
BIN_GOAL_BINS := $(foreach BG,$(BIN_GOALS),$(firstword $(subst /, ,$(BG))))
NUM_BINS := $(words $(sort $(BIN_GOAL_BINS)))
BIN_GOALS_BINS := $(sort $(foreach BG,$(BIN_GOALS),\
$(firstword $(subst /, ,$(BG)))))
NUM_BINS := $(words $(BIN_GOALS_BINS))
ifeq ($(NUM_BINS),0)
@ -191,20 +192,29 @@ ifeq ($(NUM_BINS),1)
# If exactly one BIN directory was specified, set BIN to match this
# directory.
#
BIN := $(firstword $(BIN_GOAL_BINS))
BIN := $(firstword $(BIN_GOALS_BINS))
else # NUM_BINS == 1
# More than one BIN directory was specified. We cannot handle the
# latter case within a single make invocation, so set up recursive
# targets for each BIN directory.
# targets for each BIN directory. Use exactly one target for each BIN
# directory since running multiple make invocations within the same
# BIN directory is likely to cause problems.
#
# Leave $(BIN) undefined. This has implications for any target that
# depends on $(BIN); such targets should be made conditional upon the
# existence of $(BIN).
#
$(BIN_GOALS) : % : BIN_RECURSE
$(Q)$(MAKE) --no-print-directory BIN=$(firstword $(subst /, ,$@)) $@
BIN_GOALS_FIRST := $(foreach BGB,$(BIN_GOALS_BINS),\
$(firstword $(filter $(BGB)/%,$(BIN_GOALS))))
BIN_GOALS_OTHER := $(filter-out $(BIN_GOALS_FIRST),$(BIN_GOALS))
$(BIN_GOALS_FIRST) : % : BIN_RECURSE
$(Q)$(MAKE) --no-print-directory BIN=$(firstword $(subst /, ,$@)) \
$(filter $(firstword $(subst /, ,$@))/%, $(BIN_GOALS))
$(BIN_GOALS_OTHER) : % : BIN_RECURSE
$(Q)$(TRUE)
.PHONY : BIN_RECURSE
endif # NUM_BINS == 1