9020ef64e3
The -j flag should only be submitted once. If we are enclosed by yet another layer of makes, then it will have setup everything for this sub-make to take part in the job pool.
44 lines
2.1 KiB
Makefile
44 lines
2.1 KiB
Makefile
# GNUmakefile is processed before Makefile, which is why we arrive here
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# first; when we call the other makefile, then we must specify its real
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# name with the -f parameter
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# figure out the number of processors from the system, add one and round
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# to nearest integer. this is the maximum number of processes we want running
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# at the same time (one for each core and one stuck on I/O)
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# if we are running this is a VM, then /proc won't be mounted and we revert
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# to single CPU processing
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CPUINFO:=/proc/cpuinfo
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NUM_CPUS:=$(shell test -r $(CPUINFO) && grep -P -c '^processor\t:' $(CPUINFO) || echo 0)
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PROCS:=$(shell echo "("$(NUM_CPUS)+1")"/1 | bc)
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# use these utilities if they are available
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IONICE:=$(shell test -x "$$(which ionice)" && echo ionice -c2 -n7)
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NICE:=$(shell test -x "$$(which nice)" && echo nice)
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# we do dependency management the right way; don't attempt to cache
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export CCACHE_DISABLE:=1
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# ignore that there may be files with these names, we are going to call
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# the other make regardless
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.PHONY: __everything $(MAKECMDGOALS)
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# outsource the processing to the real makefile, running in parallel and
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# in a nice environment so that it doesn't hog our workstation. if there
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# is nothing else happening on the box, then it will run just as fast
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# the leading plus makes us run this regardless of options, see
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# http://www.gnu.org/software/make/manual/make.html#Instead-of-Execution
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__everything:
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# only put on a parallel flag if there isn't already one; otherwise we
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# get the warning "-jN forced in submake: disabling jobserver mode".
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# this have to happen inside the rule, because -j option is removed from
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# MAKEFLAGS outside
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+@$(IONICE) $(NICE) $(MAKE) --no-print-directory -f Makefile $(if $(findstring -j,$(MAKEFLAGS)),,-j $(PROCS)) $(MAKECMDGOALS)
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# automatically generate all the goals we are asked to make and delegate
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# processing of them to the real makefile through the dependency (since
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# everything depends on the same thing, then we only call the other make
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# once). the dummy command is just there to make sure that make doesn't
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# show the "Nothing to do for `foo'" message after processing
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$(MAKECMDGOALS): __everything
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@true
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