Minor cleanup. Moved code around a bit, to functions, away from main().

This commit is in preparation for importing the Westermo code changes.
Slowly refactoring the finit core into a more modularized unit to be a
bit more maintainable.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

common.mk

@@ -0,0 +1,20 @@
+# Some junk files we always want to be removed when doing a make clean.
+JUNK       = *~ *.bak *.aux *.dvi *.idx *.ind *.log *.ps *.map .*.d DEADJOE semantic.cache *.gdb *.elf core core.*
+RM        := -@$(RM)
+MAKE      := @$(MAKE)
+MAKEFLAGS  = --no-print-directory
+
+# Smart autodependecy generation via GCC -M.
+.%.d: %.c
+	@$(SHELL) -ec "$(CC) -MM $(CFLAGS) $(CPPFLAGS) $< \
+		| sed 's,.*: ,$*.o $@ : ,g' > $@; \
+                [ -s $@ ] || rm -f $@"
+
+# Override default implicit rules
+%.o: %.c
+	@printf "  CC      $(subst $(ROOTDIR)/,,$(shell pwd)/$@)\n"
+	@$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
+
+%: %.o
+	@printf "  LINK    $(subst $(ROOTDIR)/,,$(shell pwd)/$@)\n"
+	@$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-Map,$@.map -o $@ $^ $(LDLIBS$(LDLIBS-$(@)))