add clippy-json target

Add a clippy-json target to the ninja script.

This is useful for rust-analyzer, which requires an "external check
command" to function when not using cargo.

Also we add a "clippy-json-prereq" target, and invoke it in the
clippy.py script. The prereq target tries to build as much of the
project as possible with "-k0".

1 files changed, 9 insertions, 0 deletions

diff --git a/docs/markdown/snippets/clippy-json.md b/docs/markdown/snippets/clippy-json.md
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+# New "clippy-json" Ninja Target For rust-analyzer
+
+A new `clippy-json` ninja target will now be generated for rust projects.
+
+rust-analyzer supports non-cargo based projects so long as you provide it with a `rust-project.json` file and a custom "check command" to provide compiler errors.
+
+Meson already for some time has generated a `rust-project.json` file for rust-analyzer, but had no way to hook up its rustc/clippy output to rust-analyzer.
+
+To use the new feature, you want to override the rust-analyzer check command as shown [here](https://rust-analyzer.github.io/book/non_cargo_based_projects.html), and set it to `ninja clippy-json -C build` or something to the same effect.