1.4 Warnings

gcj implements several warnings. As with other generic gcc warnings, if an option of the form -Wfoo enables a warning, then -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.

-Wredundant-modifiers

With this flag, gcj will warn about redundant modifiers. For instance, it will warn if an interface method is declared public.

-Wextraneous-semicolon

This causes gcj to warn about empty statements. Empty statements have been deprecated.

-Wno-out-of-date

This option will cause gcj not to warn when a source file is newer than its matching class file. By default gcj will warn about this.

-Wno-deprecated

Warn if a deprecated class, method, or field is referred to.

-Wunused

This is the same as gcc's -Wunused.

-Wall

This is the same as -Wredundant-modifiers -Wextraneous-semicolon -Wunused.