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Build: wrap make invocations with flock(1)

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Lock each directory before entering it so when using -j, the same
dependency isn't built more than once at a time.

This doesn't get full -j parallelism though, since one make child
will be sitting idle waiting for flock to receive its lock and
continue making (which should then do nothing since it will have
been built already).  Unfortunately there's not much that can be
done to fix that since it can't proceed until its dependency is
built by another make process.
This commit is contained in:
joshua stein 2019-12-27 23:50:39 -06:00 • committed by Andreas Kling
parent d622e4d224
commit 0b501335f5
10 changed files with 21 additions and 21 deletions
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8
Libraries/LibHTML/Makefile
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@ -71,10 +71,10 @@ GENERATE_CSS_PROPERTYID_CPP = CodeGenerators/Generate_CSS_PropertyID_cpp/Generat
GENERATE_CSS_PROPERTYID_H = CodeGenerators/Generate_CSS_PropertyID_h/Generate_CSS_PropertyID_h
$(GENERATE_CSS_PROPERTYID_H):
@$(MAKE) -C $(dir $(GENERATE_CSS_PROPERTYID_H))
@flock $(dir $(GENERATE_CSS_PROPERTYID_H)) $(MAKE) -C $(dir $(GENERATE_CSS_PROPERTYID_H))
$(GENERATE_CSS_PROPERTYID_CPP):
@$(MAKE) -C $(dir $(GENERATE_CSS_PROPERTYID_CPP))
@flock $(dir $(GENERATE_CSS_PROPERTYID_CPP)) $(MAKE) -C $(dir $(GENERATE_CSS_PROPERTYID_CPP))
CSS/DefaultStyleSheetSource.cpp: CSS/Default.css Scripts/GenerateStyleSheetSource.sh
@echo "GENERATE $@"
@ -82,11 +82,11 @@ CSS/DefaultStyleSheetSource.cpp: CSS/Default.css Scripts/GenerateStyleSheetSourc
CSS/PropertyID.h: CSS/Properties.json $(GENERATE_CSS_PROPERTYID_H)
@echo "GENERATE $@"
$(QUIET) $(GENERATE_CSS_PROPERTYID_H) $< > $@
$(QUIET) flock CSS $(GENERATE_CSS_PROPERTYID_H) $< > $@
CSS/PropertyID.cpp: CSS/Properties.json $(GENERATE_CSS_PROPERTYID_CPP)
@echo "GENERATE $@"
$(QUIET) $(GENERATE_CSS_PROPERTYID_CPP) $< > $@
$(QUIET) flock CSS $(GENERATE_CSS_PROPERTYID_CPP) $< > $@
EXTRA_CLEAN = CSS/DefaultStyleSheetSource.cpp CSS/PropertyID.h CSS/PropertyID.cpp