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