Summary

Add new compiler option: --help-lint.

Problem

Currently, the output of the option --help-extra(-X) includes the information of -Xlint sub-options(sub-options are also called supported keys). The number of the -Xlint sub-options is growing so that the output of the option --help-extra(-X) grows correspondingly. It makes the output complicated and unclear. And it is uncomfortable to the users who don't want to read the -Xlint sub-options.

Solution

We can extract the information about -Xlint sub-options into a new option -help-lint which keeps the output of the --help-extra(-X) clear.

Specification

After completing this feature, the compiler will have the following behavior.

1. When we use option --help-extra(-X), the compiler only output the information about the top options.

2. When we use option --help-lint, the compiler would output the information about the -Xlint sub-options.

This change would not affect other options and the public API of the compiler.