Why is -XD-Xmodule hidden?

[Nicolai Parlog]

 Hi!

When incrementally compiling some of a module's sources it is necessary
to make the compiler aware that the sources actually belong to that
module. One way to do this was the non-standard option -Xmodule, which
was recently demoted to the hidden -XD-Xmodule.

I'm curious to know why.

Example:

	javac --module-path mods -d classes
		src/foo.mod/com.example.SomeClass.java

This will compile SomeClass in the unnamed module, making it fail if it
uses types from bar.mod (even if foo.mod requires it).

I know of three ways to fix this:

* adding module declaration to compile command
* multi-module declaration
* option -XD-Xmodule

I found the last option to be conceptually most fitting and also the
least troublesome.

 so long ... Nicolai



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