gcj implements several warnings. As with other generic
gcc warnings, if an option of the form
-Wfoo enables a
-Wno-foo will disable it. Here we've chosen to
document the form of the warning which will have an effect - the
default being the opposite of what is listed.
gcjwill warn about redundant modifiers. For instance, it will warn if an interface method is declared
gcjto warn about empty statements. Empty statements have been deprecated.
gcjnot to warn when a source file is newer than its matching class file. By default
gcjwill warn about this.
-Wredundant-modifiers -Wextraneous-semicolon -Wunused.