Advent of Code 2021, see plus plus edition
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CXXFLAGS := -std=c++20 -O2 -Wall -Wextra
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sources := $(wildcard *.cc)
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progs := $(patsubst %.cc,%,$(sources))
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.PHONY: all
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all: $(progs)
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.PHONY: clean
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clean:
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rm -f $(progs) $(progs:=_test.txt)
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.PHONY: test
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test: $(addprefix test-,$(progs))
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.PHONY: test-%
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test-%: %_test.txt
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@test -f $*_output.txt && (diff -u $*_output.txt $<; rm -f $<) || true
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@test -f $*_output.txt || cat $<
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$(progs:=_test.txt): %_test.txt: %
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./$< $*_input.txt > $@
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