1 files changed, 56 insertions, 12 deletions

diff --git a/makefile b/makefile
index d842299..ea514c2 100644
--- a/makefile
+++ b/makefile
@@ -1,22 +1,66 @@
-all: bcrypt-test
+BCRYPT_VERSION=2.3-1
 
-# git clone https://github.com/mikejsavage/lua-bcrypt.git
-LUA_BCRYPT_PATH=../lua-bcrypt/src
+BCRYPT_DIR=libbcrypt
 
-CFLAGS=-Wall -Werror -Wno-pointer-sign -std=c17 -O2 -I$(LUA_BCRYPT_PATH)
+BCRYPT_SRC_DIR=$(BCRYPT_DIR)/lua-bcrypt-$(BCRYPT_VERSION)/src
+BCRYPT_OBJ_DIR=$(BCRYPT_DIR)/obj
+BCRYPT_LIB_DIR=$(BCRYPT_DIR)/lib
 
-bcrypt-test: bcrypt-test.o bcrypt-lib.a
-        cc -o $@ bcrypt-test.o bcrypt-lib.a
+BCRYPT_ARCHIVE=$(BCRYPT_DIR)/lua-bcrypt.tar.gz
 
-bcrypt-lib.a: bcrypt.o blowfish.o ggentropy.o safebfuns.o
+BCRYPT_SOURCES= \
+        $(BCRYPT_SRC_DIR)/bcrypt.c \
+        $(BCRYPT_SRC_DIR)/blowfish.c \
+        $(BCRYPT_SRC_DIR)/ggentropy.c \
+        $(BCRYPT_SRC_DIR)/safebfuns.c
+
+BCRYPT_OBJS=$(BCRYPT_SOURCES:$(BCRYPT_SRC_DIR)/%.c=$(BCRYPT_OBJ_DIR)/%.o)
+
+BCRYPT_LIB=$(BCRYPT_LIB_DIR)/libbcrypt.a
+
+BCRYPT_UNPACKED=$(BCRYPT_DIR)/.unpacked
+
+CFLAGS=-Wall -Werror -pedantic -Wno-pointer-sign -std=c11 -O2 -I$(BCRYPT_SRC_DIR)
+
+all: bin/bcrypt-test
+
+# === App ===
+
+bin/bcrypt-test: obj/bcrypt-test.o $(BCRYPT_LIB) | bin
+        cc -o $@ obj/bcrypt-test.o $(BCRYPT_LIB)
+
+obj/%.o: src/%.c $(BCRYPT_UNPACKED) | obj
+        cc $(CFLAGS) -c $< -o $@
+
+obj bin:
+        mkdir -p $@
+
+# === libbcrypt ===
+
+$(BCRYPT_ARCHIVE): | $(BCRYPT_DIR)
+        curl -f -L -o $@ https://github.com/mikejsavage/lua-bcrypt/archive/refs/tags/v$(BCRYPT_VERSION).tar.gz
+
+$(BCRYPT_UNPACKED): $(BCRYPT_ARCHIVE)
+        tar -xzf $< -C $(BCRYPT_DIR)
+        touch $@
+
+download: $(BCRYPT_UNPACKED)
+
+# The extracted sources are generated as a side effect of unpacking.
+$(BCRYPT_SOURCES): $(BCRYPT_UNPACKED)
+
+$(BCRYPT_OBJ_DIR)/%.o: $(BCRYPT_SRC_DIR)/%.c | $(BCRYPT_OBJ_DIR)
+        cc $(CFLAGS) -c $< -o $@
+
+$(BCRYPT_LIB): $(BCRYPT_OBJS) | $(BCRYPT_LIB_DIR)
         ar -crs $@ $^
 
-%.o: %.c
-        cc $(CFLAGS) -o $@ -c $<
+$(BCRYPT_DIR) $(BCRYPT_LIB_DIR) $(BCRYPT_OBJ_DIR):
+        mkdir -p $@
 
-%.o: $(LUA_BCRYPT_PATH)/%.c
-        cc $(CFLAGS) -o $@ -c $<
+# === clean ===
 
 .PHONY: clean
 clean:
-        rm -f bcrypt-test *.a *.o
+        rm -rf bin obj $(BCRYPT_DIR)
+