Makefile cleanup and instrumentation (verbosity, dependencies, etc.)

- solidify/Makefile: added verbosity control (default is silent, enable
  verbose output with V=1)
- solidify/Makefile: added "spotless" target
- solidify/Makefile (CFLAGS): moved warning options to CFLAGS_WARN
- solidify/Makefile: added dependency use and generation, with friendly
  permission from fped/Makefile

solidify/Makefile

@@ -1,13 +1,54 @@
-CFLAGS=-Wall -g `pkg-config --cflags gtk+-2.0`
+SHELL = /bin/bash
-LDFLAGS=-lm `pkg-config --libs gtk+-2.0`
 
 OBJS = array.o face.o histo.o level.o solidify.o
 
-.PHONY:		all clean
+CFLAGS_WARN = -Wall -Wshadow -Wmissing-prototypes \
+	      -Wmissing-declarations -Wno-format-zero-length
+
+CFLAGS = $(CFLAGS_WARN) -g `pkg-config --cflags gtk+-2.0`
+LDFLAGS = -lm `pkg-config --libs gtk+-2.0`
+
+# ----- Verbosity control -----------------------------------------------------
+
+CC_normal	:= $(CC)
+DEPEND_normal	:= $(CPP) $(CFLAGS) -MM -MG
+
+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:		all clean spotless
 
 all:		solidify
 
 solidify:	$(OBJS)
 
 clean:
-		rm -f $(OBJS)
+		rm -f $(OBJS) $(OBJS:.o=.d)
+
+spotless:	clean
+		rm -f solidify
+
+# ----- 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)