URL:
<https://savannah.gnu.org/bugs/?57178>
Summary: Job server not invoked in initial pass
Project: make
Submitted by: paulberg
Submitted on: Wed 06 Nov 2019 11:07:42 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.2.1
Operating System: Any
Fixed Release: None
Triage Status: None
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Details:
In a recipe, a call to a sub-make process using the $(MAKE) macro coordinates
with the job server to maintain a maximum number of parallel jobs as
instructed by the -j parameter. It is expected that any use of this macro
would do the same, but in the initial expansion, use of this macro does not
coordinate and is restricted to -j1.
To Repro use 2 files (below) Makefile and test.mk. test.mk called with -j10
will return 10 normally (some race conditions possible). However, if Makefile
is called with -j10, it invokes test.mk as a sub-make and test.mk will report
that only -j1 was invoked, indicating that the job server is not being
utilized.
Expected: This test when invoked with -j n should report n (or close to n,
race conditions permitting) since the job server should coordinate the number
of available jobs and the sub process should parallelize accordingly.
FILE1 Makefile:
$(info $(shell $(MAKE) -f test.mk all))
all:
@:
FILE2 test.mk:
all: | parallel ; @echo $(JOB_COUNT)
parallel: .parallel ; @$(eval JOB_COUNT := $(shell sort -n $< | tail -n 1))
.parallel: FORCE ; @$(MAKE) -f test.mk --no-print-directory par 2>/dev/null
>$@ || true
FORCE:
to_n = $(words $2) $(if $(filter-out $1,$(words x $2)),$(call to_n,$1,x $2))
PAR_COUNT :=
par: $(addprefix par-,$(call to_n,32))
par-%: ; @$(eval PAR_COUNT += x)@echo $(words $(PAR_COUNT)) && sleep 1 &&
false
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