ptrude/: more comments; copyright headers; improved Makefile

ptrude/Makefile

@@ -1,13 +1,66 @@
-CFLAGS = -Wall -g
+#
+# Makefile - Makefile of ptrude
+#
+# Written 2011 by Werner Almesberger
+# Copyright 2011 by Werner Almesberger
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+
+SHELL = /bin/bash
+
+MAIN = ptrude
+OBJS = $(MAIN).o path.o
+
+CFLAGS = -Wall -g -Wshadow -Wmissing-prototypes \
+         -Wmissing-declarations -Wno-format-zero-length
 LDFLAGS = -lm
-OBJS = ptrude.o path.o
 
-.PHONY:	clean try
+# ----- Verbosity control -----------------------------------------------------
 
-ptrude:	$(OBJS)
+CC_normal	:= $(CC)
+DEPEND_normal	:= $(CPP) $(CFLAGS) -MM -MG
 
-try:	ptrude
-	./ptrude <try | tee out
+CC_quiet	= @echo "  CC       " $@ && $(CC_normal)
+DEPEND_quiet	= @$(DEPEND_normal)
+
+ifeq ($(V),1)
+    CC		= $(CC_normal)
+    DEPEND	= $(DEPEND_normal)
+else
+    CC		= $(CC_quiet)
+    DEPEND	= $(DEPEND_quiet)
+endif
+
+# ----- Rules -----------------------------------------------------------------
+
+.PHONY:		clean try
+
+$(MAIN):		$(OBJS)
+
+try:		$(MAIN)
+		./$(MAIN) <try | tee out
 
 clean:
-	rm -f $(OBJS)
+		rm -f $(OBJS) $(OBJS:.o=.d)
+
+spotless:	clean
+		rm -f $(MAIN)
+
+# ----- Dependencies ----------------------------------------------------------
+
+# compile and generate dependencies, from fped, based on
+# http://scottmcpeak.com/autodepend/autodepend.html
+
+%.o:		%.c
+		$(CC) -c $(CFLAGS) $*.c -o $*.o
+		$(DEPEND) $*.c | \
+		  sed -e \
+		    '/^\(.*:\)\? */{p;s///;s/ *\\\?$$/ /;s/  */:\n/g;H;}' \
+		    -e '$${g;p;}' -e d >$*.d; \
+		  [ "$${PIPESTATUS[*]}" = "0 0" ] || { rm -f $*.d; exit 1; }
+
+-include $(OBJS:.o=.d)