The warning all flag is added.

makefile

@@ -12,22 +12,22 @@ test: test.exe
 	./test.exe
 	
 example-01.exe: example-01.o tiny-json.o
-	gcc -o example-01.exe example-01.o tiny-json.o
+	gcc -Wall -o example-01.exe example-01.o tiny-json.o
 
 example-02.exe: example-02.o tiny-json.o
-	gcc -o example-02.exe example-02.o tiny-json.o
+	gcc -Wall -o example-02.exe example-02.o tiny-json.o
 
 test.exe: tests.o tiny-json.o
-	gcc -o test.exe tests.o tiny-json.o
+	gcc -Wall -o test.exe tests.o tiny-json.o
 	
 tiny-json.o: tiny-json.c tiny-json.h
-	gcc -c tiny-json.c
+	gcc -Wall -c tiny-json.c
 
 example-01.o: example-01.c tiny-json.h
-	gcc -c example-01.c
+	gcc -Wall -c example-01.c
 
 example-02.o: example-02.c tiny-json.h
-	gcc -c example-02.c
+	gcc -Wall -c example-02.c
 	
 tests.o: tests.c tiny-json.h
-	gcc -c tests.c	
+	gcc -Wall -c tests.c