Makefile

C_DEPS_DIR := $(abspath c-deps)
ZLIB_SRC_DIR    := $(C_DEPS_DIR)/zlib
LIBJPEG_SRC_DIR := $(C_DEPS_DIR)/libjpeg-turbo
QPDF_SRC_DIR    := $(C_DEPS_DIR)/qpdf

UNAME := $(shell uname)

ifneq ($(UNAME), Darwin)
XGO_LDFLAGS += -extldflags "-static"
endif

all: build

zlib: .submodules-initialized
	cd $(ZLIB_SRC_DIR) && ./configure --static && make

libjpeg: .submodules-initialized
	cd $(LIBJPEG_SRC_DIR) && cmake -G"Unix Makefiles" -DENABLE_SHARED=0 && make

qpdf: zlib libjpeg .submodules-initialized
	export LDFLAGS="-L$(ZLIB_SRC_DIR) -L$(LIBJPEG_SRC_DIR)"; \
	export CFLAGS="-I$(ZLIB_SRC_DIR) -I$(LIBJPEG_SRC_DIR)"; \
	export CPPFLAGS="$${CFLAGS}"; \
	cd $(QPDF_SRC_DIR) && ./autogen.sh && ./configure --disable-shared && make

bin/pdftilecut: qpdf zlib libjpeg
	go build -o bin/pdftilecut -ldflags "$(XGO_LDFLAGS)"

.submodules-initialized:
ifneq ($$(git rev-parse --git-dir 2>/dev/null),)
	git submodule update --init --recursive
endif
	mkdir -p $(@D)
	touch $@

build: bin/pdftilecut
	
.PHONY: clean
clean:
	cd $(ZLIB_SRC_DIR) && make clean
	cd $(LIBJPEG_SRC_DIR) && make clean
	cd $(QPDF_SRC_DIR) && make clean