.POSIX:
.SUFFIXES:

# Source code location and files to watch for changes.
SRC_DIR     := src/bootstrap
BUILD_DIR   := build
SRC_MAIN    := $(SRC_DIR)/main.c
WATCH_SRC   := $(shell find $(SRC_DIR) -name "*.c" -or -name "*.s" -or -name "*.h")
INC_DIRS    := $(shell find $(SRC_DIR) -type d)
INC_FLAGS   := $(addprefix -I,$(INC_DIRS))

# Output executable.
TARGET := bdl
BIN    := $(BUILD_DIR)/$(TARGET)

# Compiler and linker configuration.
CC             := cc
CFLAGS         := -Wall -Wextra -pedantic -DBIN_NAME=\"$(TARGET)\" -static
CFLAGS         += $(INC_FLAGS)
LDFLAGS        :=
LDLIBS         :=
RELEASE_CFLAGS := -DNDEBUG -O2
DEBUG_CFLAGS   := -DDEBUG -O2 -g

.PHONY: build tests run clean

# Setup debug/release builds.
#     make clean && make <target> DEBUG=0
#     make clean && make <target> DEBUG=1
DEBUG ?= 0
ifeq ($(DEBUG), 1)
    CFLAGS += $(DEBUG_CFLAGS)
else
    CFLAGS += $(RELEASE_CFLAGS)
endif

main: $(BIN)

$(BIN): $(SRC_MAIN) $(WATCH_SRC) $(BUILD_DIR)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $(BIN) $(SRC_MAIN) $(LDLIBS)

# Create build directory if needed.
$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

run: $(BIN)
	./$(BIN) -i

tests: $(BIN)
	./$(BIN) examples/arithmetic.bdl | diff tests/arithmetic_expected.txt -
	./$(BIN) examples/booleans.bdl | diff tests/booleans_expected.txt -
	./$(BIN) examples/lists.bdl | diff tests/lists_expected.txt -
	./$(BIN) examples/types.bdl | diff tests/types_expected.txt -
	./$(BIN) examples/variables.bdl | diff tests/variables_expected.txt -

# Remove build directory.
clean:
	rm -rf $(BUILD_DIR)