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34 lines
920 B
Makefile
34 lines
920 B
Makefile
ifneq (, $(filter buildtest info-concurrency, $(MAKECMDGOALS)))
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ifeq (, $(strip $(NPROC)))
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# Linux (utility program)
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NPROC := $(shell nproc 2>/dev/null)
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ifeq (, $(strip $(NPROC)))
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# Linux (generic)
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NPROC := $(shell grep -c ^processor /proc/cpuinfo 2>/dev/null)
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endif
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ifeq (, $(strip $(NPROC)))
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# BSD (at least FreeBSD and Mac OSX)
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NPROC := $(shell sysctl -n hw.ncpu 2>/dev/null)
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endif
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ifeq (, $(strip $(NPROC)))
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# Fallback
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NPROC := 1
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endif
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NPROC := $(shell echo $$(($(NPROC) + 1)))
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ifneq (, $(NPROC_MAX))
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NPROC := $(shell if [ $(NPROC) -gt $(NPROC_MAX) ]; then echo $(NPROC_MAX); else echo $(NPROC); fi)
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endif
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ifneq (, $(NPROC_MIN))
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NPROC := $(shell if [ $(NPROC) -lt $(NPROC_MIN) ]; then echo $(NPROC_MIN); else echo $(NPROC); fi)
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endif
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endif
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endif
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.PHONY: info-concurrency
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info-concurrency:
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@echo "$(NPROC)"
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