# Recursive wildcard function (properly defined)
rwildcard = $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) $(filter $(subst *,%,$2),$d))

CXX = g++
CXXFLAGS = -Wall -std=c++20

# Use $(call ...) not ${call ...}
ALL_LIBS = $(call rwildcard,math/,*.cpp) $(call rwildcard,generators/,*.cpp) $(call rwildcard,randomness_tests/,*.cpp)

# Expand wildcard properly for current directory
SRCS = main.cpp $(ALL_LIBS)

TEST_SRCS = code_tests/test.cpp $(ALL_LIBS)

TARGET = splat
TEST_TARGET = splat_test

.PHONY: all main test clean
all: $(TARGET) ${TEST_TARGET}
$(TARGET): $(SRCS)
	$(CXX) $(CXXFLAGS) -o $@ $^

test: $(TEST_TARGET)

$(TEST_TARGET): $(TEST_SRCS)
	$(CXX) $(CXXFLAGS) -o $@ $^

clean:
	rm -f $(TARGET) $(TEST_TARGET) *.o