Makefile improvement using LLM

Makefile

@@ -1,54 +1,77 @@
-CFLAGS=-Wall -Werror -pthread -O3 -g0
-CFLAGS += -DGETRANDOM -DARG_REPLACE_GETOPT=0
-LDFLAGS=-lm -s
+# Directories
+SRC_DIR := src
+OBJ_DIR := objs
 
+# Common flags
+CFLAGS_COMMON  := -Wall -Werror -pthread
+CFLAGS_RELEASE := -O3 -g0
+CFLAGS_DEBUG   := -O0 -g
+DEFINES        := -DGETRANDOM -DARG_REPLACE_GETOPT=0
+
+LDFLAGS_COMMON := -lm
+LDFLAGS_RELEASE := -s
+
+# Default build flags (can be overridden from the command line)
+CFLAGS  ?= $(CFLAGS_COMMON) $(CFLAGS_RELEASE) $(DEFINES)
+LDFLAGS ?= $(LDFLAGS_COMMON) $(LDFLAGS_RELEASE)
+
+# Source lists
+LIB_SOURCES := \
+	argtable3.c \
+	base64.c \
+	binhex.c \
+	curve25519.c \
+	inexact.c \
+	norx_inexact.c \
+	sha3.c \
+	tests.c \
+	readpassphrase.c \
+	randombytes.c \
+	chacha20_drng.c \
+	blake2.c
+
+ARGON2_SOURCES := \
+	argon2.c \
+	argon2-core.c \
+	argon2-thread.c \
+	argon2-encoding.c \
+	argon2-impl-select.c \
+	argon2-arch.c
+
+MAIN_SOURCE := main.c
+
+# Derived paths
+LIB_SRCS     := $(addprefix $(SRC_DIR)/,$(LIB_SOURCES))
+LIB_OBJS     := $(addprefix $(OBJ_DIR)/,$(LIB_SOURCES:.c=.o))
+ARGON2_SRCS  := $(addprefix $(SRC_DIR)/,$(ARGON2_SOURCES))
+MAIN_SRC     := $(addprefix $(SRC_DIR)/,$(MAIN_SOURCE))
+
+# Phony targets
+.PHONY: all default release debug clean
+
+# Default target
+all: inexact
 default: inexact
+release: inexact
 
-debug: CFLAGS=-Wall -Werror -pthread -O0 -g
-debug: CFLAGS += -DGETRANDOM -DARG_REPLACE_GETOPT=0
-debug: LDFLAGS=-lm
+# Debug build: override flags for this target only
+debug: CFLAGS  := $(CFLAGS_COMMON) $(CFLAGS_DEBUG) $(DEFINES)
+debug: LDFLAGS := $(LDFLAGS_COMMON)
 debug: inexact
 
-argtable3.o: src/argtable3.c
-	mkdir -p objs
-	$(CC) $(CFLAGS) -c src/argtable3.c -o objs/argtable3.o
+# Link final binary
+inexact: $(LIB_OBJS) $(ARGON2_SRCS) $(MAIN_SRC)
+	$(CC) $(CFLAGS) $(ARGON2_SRCS) $(MAIN_SRC) $(LIB_OBJS) -o $@ $(LDFLAGS)
 
-base64.o: src/base64.c
-	$(CC) $(CFLAGS) -c src/base64.c -o objs/base64.o
+# Ensure object directory exists
+$(OBJ_DIR):
+	mkdir -p $(OBJ_DIR)
 
-binhex.o: src/binhex.c
-	$(CC) $(CFLAGS) -c src/binhex.c -o objs/binhex.o
-
-curve25519.o: src/curve25519.c
-	$(CC) $(CFLAGS) -c src/curve25519.c -o objs/curve25519.o
-
-inexact.o: src/inexact.c
-	$(CC) $(CFLAGS) -c src/inexact.c -o objs/inexact.o
-
-norx_inexact.o: src/norx_inexact.c
-	$(CC) $(CFLAGS) -c src/norx_inexact.c -o objs/norx_inexact.o
-
-sha3.o: src/sha3.c
-	$(CC) $(CFLAGS) -c src/sha3.c -o objs/sha3.o
-
-tests.o: src/tests.c
-	$(CC) $(CFLAGS) -c src/tests.c -o objs/tests.o
-
-readpassphrase.o: src/readpassphrase.c
-	$(CC) $(CFLAGS) -c src/readpassphrase.c -o objs/readpassphrase.o
-
-randombytes.o: src/randombytes.c
-	$(CC) $(CFLAGS) -c src/randombytes.c -o objs/randombytes.o
-
-chacha20_drng.o: src/chacha20_drng.c
-	$(CC) $(CFLAGS) -c src/chacha20_drng.c -o objs/chacha20_drng.o
-
-blake2.o: src/blake2.c
-	$(CC) $(CFLAGS) -c src/blake2.c -o objs/blake2.o
-
-inexact: src/main.c argtable3.o base64.o binhex.o curve25519.o inexact.o norx_inexact.o sha3.o tests.o readpassphrase.o chacha20_drng.o randombytes.o blake2.o
-	$(CC) $(CFLAGS) src/argon2.c src/argon2-core.c src/argon2-thread.c src/argon2-encoding.c src/argon2-impl-select.c src/argon2-arch.c src/main.c objs/argtable3.o objs/base64.o objs/binhex.o objs/curve25519.o objs/inexact.o objs/norx_inexact.o objs/sha3.o objs/tests.o objs/readpassphrase.o objs/randombytes.o objs/chacha20_drng.o objs/blake2.o -o inexact $(LDFLAGS)
+# Generic rule to build objects from src/*.c into objs/*.o
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
+	$(CC) $(CFLAGS) -c $< -o $@
 
+# Cleanup
 clean:
-	-rm objs/*.o
-	-rm -f inexact inexact.exe
+	-$(RM) $(LIB_OBJS)
+	-$(RM) inexact inexact.exe