URL:
<https://savannah.gnu.org/bugs/?57692>
Summary: Parallel make doesn't work well with grouped targets
Project: make
Submitted by: spth
Submitted on: Wed 29 Jan 2020 10:42:26 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: None
Operating System: None
Fixed Release: None
Triage Status: None
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Details:
I use GNU make 4.2.1 (as part of Debian GNU/Linux testing); I have not checked
if other versions of GNU make are affected.
I noticed that parallel make results in the rules for grouped targets being
executed multiple times (for me it corrupted files by multiple processes
appending to the same file simultaneously). Which is unlikely to be what users
want, as it easily results in corrupted files, and is inefficient.
The following Makefile, when invoked using make -j 4 reproduces the issue (I
see the text "Sleeping" four times):
RESULTS = a b c d
.PHONY: all clean
all: $(RESULTS)
$(RESULTS) &:
echo "Sleeping"; sleep 1;
touch $(RESULTS)
clean:
rm -f $(RESULTS)
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