Auto merge of #103042 - davidtwco:translation-distributed-ftl, r=oli-obk

errors: generate typed identifiers in each crate

Instead of loading the Fluent resources for every crate in `rustc_error_messages`, each crate generates typed identifiers for its own diagnostics and creates a static which are pulled together in the `rustc_driver` crate and provided to the diagnostic emitter.

There are advantages and disadvantages to this change..

#### Advantages
- Changing a diagnostic now only recompiles the crate for that diagnostic and those crates that depend on it, rather than `rustc_error_messages` and all crates thereafter.
- This approach can be used to support first-party crates that want to supply translatable diagnostics (e.g. `rust-lang/thorin` in https://github.com/rust-lang/rust/pull/102612#discussion_r985372582, cc `@JhonnyBillM)`
- We can extend this a little so that tools built using rustc internals (like clippy or rustdoc) can add their own diagnostic resources (much more easily than those resources needing to be available to `rustc_error_messages`)

#### Disadvantages
- Crates can only refer to the diagnostic messages defined in the current crate (or those from dependencies), rather than all diagnostic messages.
- `rustc_driver` (or some other crate we create for this purpose) has to directly depend on *everything* that has error messages.
  - It already transitively depended on all these crates.

#### Pending work
- [x] I don't know how to make `rustc_codegen_gcc`'s translated diagnostics work with this approach - because `rustc_driver` can't depend on that crate and so can't get its resources to provide to the diagnostic emission. I don't really know how the alternative codegen backends are actually wired up to the compiler at all.
- [x] Update `triagebot.toml` to track the moved FTL files.

r? `@compiler-errors`
cc #100717

1 files changed, 44 insertions, 2 deletions

diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index d7e9e00f3b6..54bcb154da2 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -23,11 +23,14 @@ use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults};
 use rustc_data_structures::profiling::{get_resident_set_size, print_time_passes_entry};
 use rustc_data_structures::sync::SeqCst;
 use rustc_errors::registry::{InvalidErrorCode, Registry};
-use rustc_errors::{ErrorGuaranteed, PResult, TerminalUrl};
+use rustc_errors::{
+    DiagnosticMessage, ErrorGuaranteed, PResult, SubdiagnosticMessage, TerminalUrl,
+};
 use rustc_feature::find_gated_cfg;
 use rustc_interface::util::{self, collect_crate_types, get_codegen_backend};
 use rustc_interface::{interface, Queries};
 use rustc_lint::LintStore;
+use rustc_macros::fluent_messages;
 use rustc_metadata::locator;
 use rustc_session::config::{nightly_options, CG_OPTIONS, Z_OPTIONS};
 use rustc_session::config::{ErrorOutputType, Input, OutputType, PrintRequest, TrimmedDefPaths};
@@ -61,6 +64,44 @@ use crate::session_diagnostics::{
     RLinkWrongFileType, RlinkNotAFile, RlinkUnableToRead,
 };
 
+fluent_messages! { "../locales/en-US.ftl" }
+
+pub static DEFAULT_LOCALE_RESOURCES: &[&str] = &[
+    // tidy-alphabetical-start
+    crate::DEFAULT_LOCALE_RESOURCE,
+    rustc_ast_lowering::DEFAULT_LOCALE_RESOURCE,
+    rustc_ast_passes::DEFAULT_LOCALE_RESOURCE,
+    rustc_attr::DEFAULT_LOCALE_RESOURCE,
+    rustc_borrowck::DEFAULT_LOCALE_RESOURCE,
+    rustc_builtin_macros::DEFAULT_LOCALE_RESOURCE,
+    rustc_codegen_ssa::DEFAULT_LOCALE_RESOURCE,
+    rustc_const_eval::DEFAULT_LOCALE_RESOURCE,
+    rustc_error_messages::DEFAULT_LOCALE_RESOURCE,
+    rustc_expand::DEFAULT_LOCALE_RESOURCE,
+    rustc_hir_analysis::DEFAULT_LOCALE_RESOURCE,
+    rustc_hir_typeck::DEFAULT_LOCALE_RESOURCE,
+    rustc_incremental::DEFAULT_LOCALE_RESOURCE,
+    rustc_infer::DEFAULT_LOCALE_RESOURCE,
+    rustc_interface::DEFAULT_LOCALE_RESOURCE,
+    rustc_lint::DEFAULT_LOCALE_RESOURCE,
+    rustc_metadata::DEFAULT_LOCALE_RESOURCE,
+    rustc_middle::DEFAULT_LOCALE_RESOURCE,
+    rustc_mir_build::DEFAULT_LOCALE_RESOURCE,
+    rustc_mir_dataflow::DEFAULT_LOCALE_RESOURCE,
+    rustc_monomorphize::DEFAULT_LOCALE_RESOURCE,
+    rustc_parse::DEFAULT_LOCALE_RESOURCE,
+    rustc_passes::DEFAULT_LOCALE_RESOURCE,
+    rustc_plugin_impl::DEFAULT_LOCALE_RESOURCE,
+    rustc_privacy::DEFAULT_LOCALE_RESOURCE,
+    rustc_query_system::DEFAULT_LOCALE_RESOURCE,
+    rustc_resolve::DEFAULT_LOCALE_RESOURCE,
+    rustc_session::DEFAULT_LOCALE_RESOURCE,
+    rustc_symbol_mangling::DEFAULT_LOCALE_RESOURCE,
+    rustc_trait_selection::DEFAULT_LOCALE_RESOURCE,
+    rustc_ty_utils::DEFAULT_LOCALE_RESOURCE,
+    // tidy-alphabetical-end
+];
+
 /// Exit status code used for successful compilation and help output.
 pub const EXIT_SUCCESS: i32 = 0;
 
@@ -218,6 +259,7 @@ fn run_compiler(
         output_file: ofile,
         output_dir: odir,
         file_loader,
+        locale_resources: DEFAULT_LOCALE_RESOURCES,
         lint_caps: Default::default(),
         parse_sess_created: None,
         register_lints: None,
@@ -1162,7 +1204,7 @@ static DEFAULT_HOOK: LazyLock<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send +
 /// hook.
 pub fn report_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+        rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES.to_vec(), false);
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,