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Speed up parallel builds

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- make should be $(MAKE)
 - add + in front of rules spawning long-lasted make process in a
subshell. (This would not be needed with $(MAKE) -C .. target, but our
makefiles do not handle that because they use $(PWD))
 - split the main 'all' rule as all 4 targets are independant
 - fix dependencies where appropriate for parallelism

Extra, not speed-related changes:
 - remove some double-colon for targets as they do not need it

This cuts build time from 5s to 1.5s on a laptop with -j4, and more
importantly from 85s to 35s on a KNL node.
As a bonus, the fixed dependencies removes the need to clean before
rebuilding all the time. Probably.
This commit is contained in:
Dominique Martinet
2017-09-14 17:17:25 +09:00
parent b962da700b
commit b894619d1b
5 changed files with 32 additions and 24 deletions
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2
executer/kernel/mcoverlayfs/Makefile.in
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@@ -33,7 +33,7 @@ endif
modules:
ifneq ($(BUILD_MODULE),none)
@(cd $(BUILD_MODULE); make modules)
+@(cd $(BUILD_MODULE); make modules)
endif
clean: