C templates GNUmakefile : cleanup and doc update

c/templates/GNUmakefile

@@ -9,46 +9,44 @@
 #   code.
 #
 # To use this makefile (GNU make only):
-#   "make": build with all predefined tests (without editing test source code)
-#   "make debugall": build with all predefined tests and debug code
-#   "make mem": perform memcheck with all tests enabled
-#   "make unit": build standalone (unit) test
-#   "make debug": build standalone test with debugging code
+# 1) copy it into exercise directory
+# 2) add ex.h to exercise include file
+# 3) add ex.c to exercise source code, and create a suitable main function
+# 4) use make with one of the following targets :
+#   all: compile and run all predefined tests.
+#   nowarn: compile with no -Wall and -Wextra, and run all predefined tests
+#   debug: compile with -DDEBUG and run all predefined tests
+#   mem: perform memcheck with all tests enabled
+#   unit: build standalone (unit) binary
+#   unitnowarn: build standalone binary with -Wall and -Wextra disabled
+#   unitdebug: build standalone binary with -DDEBUG
 #
 # Original 'makefile' targets can be used (test, memcheck, clean, ...)
 
-.PHONY: default all mem unit debug std debugtest
+.PHONY: default all nowarn debug mem unitnowarn unitdebug unit
 
 default: all
 
-# default is to build with all predefined tests
-BUILD := teststall
-
 include makefile
 
 all: CFLAGS+=-DTESTALL
 all: clean test
 
 nowarn: CFLAGS:=$(filter-out -Wextra -Wall,$(CFLAGS))
-nowarn: clean test
+nowarn: clean all
 
-debugall: CFLAGS+=-DDEBUG
-debugall: all
-
-debugtest: CFLAGS+=-DDEBUG
-debugtest: test
+debug: CFLAGS+=-DDEBUG
+debug: all
 
 mem: CFLAGS+=-DTESTALL
 mem: clean memcheck
 
+unitnowarn: CFLAGS:=$(filter-out -Wextra -Wall,$(CFLAGS))
+unitnowarn: clean unit
+
+unitdebug: CFLAGS+=-DDEBUG
+unitdebug: clean unit
+
 unit: CFLAGS+=-DUNIT_TEST
-unit: clean std
-
-debug: CFLAGS+=-DUNIT_TEST -DDEBUG
-debug: clean std
-
-debugtest: CFLAGS+=-DDEBUG
-debugtest: test
-
-std: src/*.c src/*.h
+unit: src/*.c src/*.h
 	$(CC) $(CFLAGS) src/*.c -o tests.out  $(LIBS)