PHONY_TARGETS := distclean all configure

.PHONY: install $(PHONY_TARGETS)

SHELL := /bin/bash

RM := rm -rf

CONFIGURE_CMD := ./configure

# Automatically select the number of processors.

# You can override that on the command line: "make NPROC=1".

NPROC := 1

ifeq ($(OS),Windows_NT)

else

UNAME_S := $(shell uname -s)

ifeq ($(UNAME_S),Linux)

# Keep one proc for system tasks

NPROC := $(shell nproc --ignore=1)

endif

ifeq ($(UNAME_S),Darwin)

NPROC := $(shell sysctl -n hw.ncpu)

endif

endif

all: ./build/Makefile

$(MAKE) -C build -j$(NPROC)

build/Makefile:

@ ($(CONFIGURE_CMD))

configure:

@ ($(CONFIGURE_CMD))

distclean:

@- $(RM) ./build/

SUBTARGETS := $(filter-out $(PHONY_TARGETS), $(MAKECMDGOALS))

ifneq ($(SUBTARGETS),)

$(SUBTARGETS): ./build/Makefile

$(MAKE) -C build -j$(NPROC) $(MAKECMDGOALS)

endif