31 lines
1.4 KiB
Makefile
31 lines
1.4 KiB
Makefile
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# 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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PROCS:=$(shell echo "("$$(grep -P -c '^processor\t:' /proc/cpuinfo)+1")"/1 | bc)
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# use these utilities if they are available
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IONICE:=$(shell test -x "$$(which ionice)" && echo ionice -c2 -n7)
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NICE:=$(shell test -x "$$(which nice)" && echo nice)
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# 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 $(MAKECMDGOALS)
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# outsource the processing to the real makefile, running in parallel and
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# in a nice environment so that it doesn't hog our workstation. if there
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# is nothing else happening on the box, then it will run just as fast
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__everything:
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@$(IONICE) $(NICE) $(MAKE) -f Makefile -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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