Now compile rule supported VERBOSE option

Author: mitsuki31

Makefile

@@ -138,8 +138,15 @@ else
 	$(eval LINT_FLAGS :=)
 endif
 
+ifeq "$(MAKE_VERBOSE)" "true"
+	@echo "$(PREFIX) Verbose output is ACTIVATED."
+	$(eval VERBOSE_FLAGS := -verbose)
+else
+	$(eval VERBOSE_FLAGS :=)
+endif
+
 	@echo "$(PREFIX) Compiling all source files..."
-	@$(CC) -d $(CLASSES_PATH) @$< $(LINT_FLAGS) $(FLAGS)
+	@$(CC) -d $(CLASSES_PATH) @$< $(LINT_FLAGS) $(VERBOSE_FLAGS) $(FLAGS)
 	@echo "$(PREFIX) Successfully compiled all source files."
 
 	$(eval HAS_COMPILED := $(wildcard $(CLASSES_PATH)))

docs/makefile-usage.txt

@@ -1,14 +1,20 @@
-Rules:
-   * compile       - Compiles the project.
-   * package       - Creates archived package of compiled classes.
-                         WARNING: The project needs to be compiled first!
-   * clean         - Cleans all of compiled classes and created jar.
-   * cleanbin      - Cleans all compiled class files only.
-   * check-verbose - Checks the verbose status.
-   * usage         - Prints the example usages for building the project.
-   * build-docs    - Builds the HTML pages of JMatrix's javadocs.
+Usage:
+    $ make [rules] [...] [options] [...]
+    $ make [rules] [VERBOSE[=<bool>] | INCLUDE-SRC[=<bool>]]
+    $ make [rules] [LINT[=<bool>] | FLAGS[=<flags>]]
 
-Additional Options:
+Rules:
+   * compile       - Compiles the project.
+   * package       - Creates archived package of compiled classes.
+                         WARNING: The project needs to be compiled first!
+   * clean         - Cleans all of compiled classes and created jar.
+   * cleanbin      - Cleans all compiled class files only.
+   * cleandocs     - Cleans all generated HTML documentations only.
+   * check-verbose - Checks the verbose status.
+   * usage         - Prints the example usages for building the project.
+   * build-docs    - Builds the HTML pages of JMatrix's javadocs.
+
+Additional Options:
   - Activating verbose output
 
       $ export VERBOSE=true && make [rules]
@@ -32,18 +38,13 @@ Additional Options:
 
       $ make compile FLAGS[=<flags>]
 
-Usage:
-    $ make [rules] [...] [arguments]
-    $ make [rules] [VERBOSE[=<bool>] | INCLUDE-SRC[=<bool>]]
-    $ make [rules] (LINT[=<bool>] | FLAGS[=<flags>])
-
-Tips:
+Tips:
     - Combine the rules; `Make` can understand multiple rules.
       Except for `build-docs` rule, it should be built as a standalone rule.
 
-Issues:
+Issues:
     Report any issues or suggestions, and help improve JMatrix.
     <https://github.com/mitsuki31/jmatrix/issues/new>
 
-Author:
+Author:
     Ryuu Mitsuki