Improve build rules

- Build of portable and assembly versions separately
- test.py modified to launch the correct version
- Single rule for all programs
- Source objects for each specified by a variable

c/Makefile.testing

@@ -1,7 +1,7 @@
 # This Makefile is only for testing. C callers should follow the instructions
 # in ./README.md to incorporate these C files into their existing build.
 
-NAME=blake3
+PROGS = blake3 blake3-asm example
 CC=gcc
 CFLAGS=-O3 -Wall -Wextra -std=c11 -pedantic -fstack-protector-strong -D_FORTIFY_SOURCE=2 -fPIE -fvisibility=hidden
 LDFLAGS=-pie -Wl,-z,relro,-z,now
@@ -46,8 +46,22 @@ ifdef BLAKE3_NO_NEON
 EXTRAFLAGS += -DBLAKE3_USE_NEON=0
 endif
 
-all: blake3.c blake3_dispatch.c blake3_portable.c main.c $(TARGETS)
-	$(CC) $(CFLAGS) $(EXTRAFLAGS) $^ -o $(NAME) $(LDFLAGS)
+all: blake3
+asm: blake3-asm
+
+common-objs = blake3.o blake3_dispatch.o blake3_portable.o
+
+blake3-objs = main.o $(common-objs) $(TARGETS)
+blake3: $(blake3-objs)
+
+blake3-asm-objs = main.o $(common-objs) $(ASM_TARGETS)
+blake3-asm: $(blake3-asm-objs)
+
+example-objs = example.o $(common-objs) $(ASM_TARGETS)
+example: $(example-objs)
+
+$(PROGS):
+	$(CC) $(CFLAGS) $(EXTRAFLAGS) -o $@ $($@-objs) $(LDFLAGS)
 
 .c.o:
 	$(CC) $(CFLAGS) $(EXTRAFLAGS) $($@_CFLAGS) -o $@ -c $<
@@ -61,18 +75,14 @@ blake3_avx2.o_CFLAGS = -mavx2
 blake3_avx512.o_CFLAGS = -mavx512f -mavx512vl
 
 test: CFLAGS += -DBLAKE3_TESTING -fsanitize=address,undefined
-test: all
-	./test.py
+test: blake3
+	./test.py blake3
 
-asm: blake3.c blake3_dispatch.c blake3_portable.c main.c $(ASM_TARGETS)
-	$(CC) $(CFLAGS) $(EXTRAFLAGS) $^ -o $(NAME) $(LDFLAGS)
+test_asm: CFLAGS += -DBLAKE3_TESTING -fsanitize=address,undefined
+test_asm: blake3-asm
+	./test.py blake3-asm
 
-test_asm: CFLAGS += -DBLAKE3_TESTING -fsanitize=address,undefined 
-test_asm: asm
-	./test.py
+clean:
+	rm -f $(PROGS) *.o
 
-example: example.c blake3.c blake3_dispatch.c blake3_portable.c $(ASM_TARGETS)
-	$(CC) $(CFLAGS) $(EXTRAFLAGS) $^ -o $@ $(LDFLAGS)
-
-clean: 
-	rm -f $(NAME) *.o
+.PHONY: clean all asm test test_asm

c/test.py

@@ -4,14 +4,16 @@ from binascii import hexlify
 import json
 from os import path
 import subprocess
+import sys
 
 HERE = path.dirname(__file__)
 TEST_VECTORS_PATH = path.join(HERE, "..", "test_vectors", "test_vectors.json")
 TEST_VECTORS = json.load(open(TEST_VECTORS_PATH))
 
+NAME = sys.argv[1] if len(sys.argv) > 1 else "blake3"
 
 def run_blake3(args, input):
-    output = subprocess.run([path.join(HERE, "blake3")] + args,
+    output = subprocess.run([path.join(HERE, NAME)] + args,
                             input=input,
                             stdout=subprocess.PIPE,
                             check=True)