Makefile: add 'clean_crystal' target (#4268)

makenowjust · Martin Verzilli · commit cc169505a3c2 · 2017-06-02T12:08:58.000-03:00
It is useful in compiler development cycle.

    $ vim src/...  # edit compiler sources (but incomplete)
    $ make crystal # oops! maked incompilable compiler...
    $ make crystal # failed because compiler does not work

At such time I don't want to use `make clean` because it removes
`libcrystal` and `llvmext` also. I don't want to build C++ files
again, so I added `clean-crystal` target in Makefile. It removes
the files built by `crystal` command. Now, we can use
`make clean_crystal crystal` to recompile `crystal` after removing
compiler itself.
diff --git a/Makefile b/Makefile
@@ -123,8 +123,11 @@ $(LIB_CRYSTAL_TARGET): $(LIB_CRYSTAL_OBJS)
 	$(AR) -rcs $@ $^
 
 .PHONY: clean
-clean: ## Clean up built directories and files
-	rm -rf $(O)
-	rm -rf ./doc
+clean: clean_crystal ## Clean up built directories and files
 	rm -rf $(LLVM_EXT_OBJ)
 	rm -rf $(LIB_CRYSTAL_OBJS) $(LIB_CRYSTAL_TARGET)
+
+.PHONY: clean_crystal
+clean_crystal: ## Clean up crystal built files
+	rm -rf $(O)
+	rm -rf ./doc
