Nicholas Nethercote 12640bca82 Bug 1563555 - Generate static pref getters usable from Rust code. r=glandium ... This patch introduces a new Rust crate called `static_prefs`. It also changes generate_static_pref_list.py to generate two new files. - StaticPrefsCGetters.cpp: contains C getters, which are just wrappers around the C++ getters. This is included into Preferences.cpp. - static_prefs.rs: contains declarations for the C getters, plus the `pref!` macro which provides nice syntax for calling the C getters. This is included into static_prefs/src/lib.rs. The new code is only generated for prefs marked with the new `rust` field in the YAML. It's opt-in because there's no point generating additional code for 900+ static prefs when only about 20 are currently used from Rust. This patch only marks a single pref (`browser.display.document_color_use`) with `rust: true`. That pref isn't accessed from Rust code in this patch, but it's necessary because the generated Rust code is invalid if there are zero Rust-accessed prefs. (The next patch will access that pref and others from Rust code. Differential Revision: https://phabricator.services.mozilla.com/D40791 --HG-- extra : moz-landing-system : lando		2019-08-07 05:16:55 +00:00
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