URL:
<https://savannah.gnu.org/bugs/?63981>
Summary: suppress "-jN forced in submake" warning with -j1
Group: make
Submitter: None
Submitted: Thu 30 Mar 2023 04:03:07 PM UTC
Severity: 3 - Normal
Item Group: Enhancement
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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Follow-up Comments:
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Date: Thu 30 Mar 2023 04:03:07 PM UTC By: Anonymous
In a recursive make model there may be a subdirectory which isn't
parallel-safe. This can happen particularly when building third-party code
which you can't or shouldn't fix. In this case you may want to suppress
parallelism in that sub-make by passing -j1 but this results in a warning. The
warning makes sense for any -j value >1 but not, I think, with -j1. And the
manual seems to agree. It says:
_This warning is generated if a recursive invocation of a make process is
forced to have ‘-jN’ in its argument list (*where N is greater than
one*)._
But even make 4.4.1 prints it with -j1.
Test case:
$ head -50 Makefile one.mk
==> Makefile <==
.PHONY: all
all:
$(info Building $@ in $(lastword $(MAKEFILE_LIST)))
$(MAKE) -j1 -f one.mk
==> one.mk <==
.PHONY: all
all:
$(info Building $@ in $(lastword $(MAKEFILE_LIST)))
@:
$ make-4.4.1 -j12 --no-print
Building all in Makefile
make-4.4.1 -j1 -f one.mk
make-4.4.1[1]: warning: -j1 forced in submake: resetting jobserver mode.
Building all in one.mk
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