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ports/unix/check: Split depfiles for faster build

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Having just one depfile (.depend) means it has to be fully regenerated
on every change, and it can't be done in parallel.

After this change the rebuild time after touching a single test file has
gone from 5.0 to 0.9 seconds. (make -j12)

Build of tests from clean has gone from 8.1 to 5.5s.

We could go even further and have one depfile per c-file, but this felt
like a simple first step giving a nice improvement.
This commit is contained in:
Erik Ekman 2020-12-03 21:32:47 +01:00
parent c748395bda
commit 63fb3721ef
2 changed files with 14 additions and 8 deletions
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2
.gitignore vendored
View File

@ -4,7 +4,7 @@
*lwip_unittests.xml
*.suo
*.log
.depend
.depend*
/.vscode/ipch

20
contrib/ports/unix/check/Makefile
View File

@ -57,22 +57,28 @@ TESTDIR=$(LWIPDIR)/../test/unit
include $(TESTDIR)/Filelists.mk
TESTOBJS=$(notdir $(TESTFILES:.c=.o))
DEPFILES=.depend_test .depend_lwip .depend_app
clean:
@rm -f *.o $(LWIPLIBCOMMON) $(APPLIB) lwip_unittests *.s .depend* *.core core lwip_unittests.xml
@rm -f *.o $(LWIPLIBCOMMON) $(APPLIB) lwip_unittests *.s $(DEPFILES) *.core core lwip_unittests.xml
depend dep: .depend
depend dep: $(DEPFILES)
include .depend
include $(DEPFILES)
.depend: $(LWIPFILES) $(APPFILES) $(TESTFILES)
$(CCDEP) $(CFLAGS) -MM $^ > .depend || rm -f .depend
.depend_test: $(TESTFILES)
$(CCDEP) $(CFLAGS) -MM $^ > .depend_test || rm -f .depend_test
.depend_lwip: $(LWIPFILES)
$(CCDEP) $(CFLAGS) -MM $^ > .depend_lwip || rm -f .depend_lwip
.depend_app: $(APPFILES)
$(CCDEP) $(CFLAGS) -MM $^ > .depend_app || rm -f .depend_app
ifneq ($(UNAME_S),Darwin)
# clang on Darwin doesn't support --start-group
lwip_unittests: .depend $(TESTOBJS) $(LWIPLIBCOMMON) $(APPLIB)
lwip_unittests: $(DEPFILES) $(TESTOBJS) $(LWIPLIBCOMMON) $(APPLIB)
$(CC) $(CFLAGS) -o lwip_unittests $(TESTOBJS) -Wl,--start-group $(LWIPLIBCOMMON) $(APPLIB) $(LDFLAGS) -Wl,--end-group
else
lwip_unittests: .depend $(TESTOBJS) $(LWIPLIBCOMMON) $(APPLIB)
lwip_unittests: $(DEPFILES) $(TESTOBJS) $(LWIPLIBCOMMON) $(APPLIB)
$(CC) $(CFLAGS) -o lwip_unittests $(TESTOBJS) $(LWIPLIBCOMMON) $(APPLIB) $(LDFLAGS)
endif