Lay foundation for unit test build framework.

GNU Make double colon rules, rule ;-)

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

rules.mk

@@ -1,3 +1,23 @@
+.PHONY: all clean distclean
+
+# Figure out root of library, unless used as submodule
+ROOTDIR    ?= $(shell pwd)
+
+# Default to silent build, use V=1 to get verbose mode.
+ifeq ($V,1)
+Q           =
+PRINT       = @true
+REDIRECT    =
+MAKEFLAGS   =
+else
+Q           = @
+PRINT       = @printf
+REDIRECT    = >/dev/null
+MAKEFLAGS   = --no-print-directory --silent
+endif
+
+export ROOTDIR Q PRINT MAKEFLAGS
+
 # Pretty printing and GCC -M for auto dep files
 %.o: %.c
 	$(PRINT) "  CC      $(subst $(ROOTDIR)/,,$(shell pwd)/)$@\n"
@@ -7,3 +27,18 @@
 	$(PRINT) "  LINK    $(subst $(ROOTDIR)/,,$(shell pwd)/)$@\n"
 	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-Map,$@.map -o $@ $^ $(LDLIBS$(LDLIBS-$(@)))
 
+%.test: %.c
+	$(PRINT) "  TEST    $(subst $(ROOTDIR)/,,$(shell pwd)/)$(@:.test=)\n"
+	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) -o $@ -DUNITTEST $< $(OBJS)
+	$(Q)@./$@ $(REDIRECT)
+
+
+# Default build rules for both main and unit test makefiles
+all:: $(TARGET)
+
+clean::
+	-$(Q)$(RM) $(OBJS) $(DEPS) $(TARGET) $(SOLIB) $(STATICLIB)
+
+distclean::
+	-$(Q)$(RM) $(JUNK) unittest *.o *.a *.so* *.unittest *.test
+