Rollup merge of #152102 - bjorn3:inline_fluent_codegen_backends, r=JonathanBrouwer,GuillaumeGomez

Convert to inline diagnostics in all codegen backends

Part of https://github.com/rust-lang/rust/issues/151366

r? @JonathanBrouwer

Cargo.lock

@@ -3635,7 +3635,6 @@ dependencies = [
  "rustc_codegen_ssa",
  "rustc_data_structures",
  "rustc_errors",
- "rustc_fluent_macro",
  "rustc_fs_util",
  "rustc_hashes",
  "rustc_hir",

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -125,11 +125,6 @@ pub struct CraneliftCodegenBackend {
 }
 
 impl CodegenBackend for CraneliftCodegenBackend {
-    fn locale_resource(&self) -> &'static str {
-        // FIXME(rust-lang/rust#100717) - cranelift codegen backend is not yet translated
-        ""
-    }
-
     fn name(&self) -> &'static str {
         "cranelift"
     }

compiler/rustc_codegen_gcc/messages.ftl

@@ -1,8 +0,0 @@
-codegen_gcc_unwinding_inline_asm =
-    GCC backend does not support unwinding from inline asm
-
-codegen_gcc_copy_bitcode = failed to copy bitcode to object file: {$err}
-
-codegen_gcc_lto_bitcode_from_rlib = failed to get bitcode from object file for LTO ({$gcc_err})
-
-codegen_gcc_explicit_tail_calls_unsupported = explicit tail calls with the 'become' keyword are not implemented in the GCC backend

compiler/rustc_codegen_gcc/src/errors.rs

@@ -2,24 +2,24 @@ use rustc_macros::Diagnostic;
 use rustc_span::Span;
 
 #[derive(Diagnostic)]
-#[diag(codegen_gcc_unwinding_inline_asm)]
+#[diag("GCC backend does not support unwinding from inline asm")]
 pub(crate) struct UnwindingInlineAsm {
     #[primary_span]
     pub span: Span,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_gcc_copy_bitcode)]
+#[diag("failed to copy bitcode to object file: {$err}")]
 pub(crate) struct CopyBitcode {
     pub err: std::io::Error,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_gcc_lto_bitcode_from_rlib)]
+#[diag("failed to get bitcode from object file for LTO ({$gcc_err})")]
 pub(crate) struct LtoBitcodeFromRlib {
     pub gcc_err: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_gcc_explicit_tail_calls_unsupported)]
+#[diag("explicit tail calls with the 'become' keyword are not implemented in the GCC backend")]
 pub(crate) struct ExplicitTailCallsUnsupported;

compiler/rustc_codegen_gcc/src/lib.rs

@@ -27,7 +27,6 @@ extern crate rustc_ast;
 extern crate rustc_codegen_ssa;
 extern crate rustc_data_structures;
 extern crate rustc_errors;
-extern crate rustc_fluent_macro;
 extern crate rustc_fs_util;
 extern crate rustc_hir;
 extern crate rustc_index;
@@ -105,8 +104,6 @@ use tempfile::TempDir;
 use crate::back::lto::ModuleBuffer;
 use crate::gcc_util::{target_cpu, to_gcc_features};
 
-rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
-
 pub struct PrintOnPanic<F: Fn() -> String>(pub F);
 
 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
@@ -197,10 +194,6 @@ fn load_libgccjit_if_needed(libgccjit_target_lib_file: &Path) {
 }
 
 impl CodegenBackend for GccCodegenBackend {
-    fn locale_resource(&self) -> &'static str {
-        crate::DEFAULT_LOCALE_RESOURCE
-    }
-
     fn name(&self) -> &'static str {
         "gcc"
     }

compiler/rustc_codegen_llvm/Cargo.toml

@@ -23,7 +23,6 @@ rustc_ast = { path = "../rustc_ast" }
 rustc_codegen_ssa = { path = "../rustc_codegen_ssa" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
-rustc_fluent_macro = { path = "../rustc_fluent_macro" }
 rustc_fs_util = { path = "../rustc_fs_util" }
 rustc_hashes = { path = "../rustc_hashes" }
 rustc_hir = { path = "../rustc_hir" }

compiler/rustc_codegen_llvm/messages.ftl

@@ -1,75 +0,0 @@
-codegen_llvm_autodiff_component_missing = autodiff backend not found in the sysroot: {$err}
-    .note = it will be distributed via rustup in the future
-
-codegen_llvm_autodiff_component_unavailable = failed to load our autodiff backend: {$err}
-
-codegen_llvm_autodiff_without_enable = using the autodiff feature requires -Z autodiff=Enable
-codegen_llvm_autodiff_without_lto = using the autodiff feature requires setting `lto="fat"` in your Cargo.toml
-
-codegen_llvm_copy_bitcode = failed to copy bitcode to object file: {$err}
-
-codegen_llvm_fixed_x18_invalid_arch = the `-Zfixed-x18` flag is not supported on the `{$arch}` architecture
-
-codegen_llvm_from_llvm_diag = {$message}
-
-codegen_llvm_from_llvm_optimization_diag = {$filename}:{$line}:{$column} {$pass_name} ({$kind}): {$message}
-
-codegen_llvm_load_bitcode = failed to load bitcode of module "{$name}"
-codegen_llvm_load_bitcode_with_llvm_err = failed to load bitcode of module "{$name}": {$llvm_err}
-
-codegen_llvm_lto_bitcode_from_rlib = failed to get bitcode from object file for LTO ({$err})
-
-codegen_llvm_mismatch_data_layout =
-    data-layout for target `{$rustc_target}`, `{$rustc_layout}`, differs from LLVM target's `{$llvm_target}` default layout, `{$llvm_layout}`
-
-codegen_llvm_offload_bundleimages_failed = call to BundleImages failed, `host.out` was not created
-codegen_llvm_offload_embed_failed = call to EmbedBufferInModule failed, `host.o` was not created
-codegen_llvm_offload_no_abs_path = using the `-Z offload=Host=/absolute/path/to/host.out` flag requires an absolute path
-codegen_llvm_offload_no_host_out = using the `-Z offload=Host=/absolute/path/to/host.out` flag must point to a `host.out` file
-codegen_llvm_offload_nonexisting = the given path/file to `host.out` does not exist. Did you forget to run the device compilation first?
-codegen_llvm_offload_without_enable = using the offload feature requires -Z offload=<Device or Host=/absolute/path/to/host.out>
-codegen_llvm_offload_without_fat_lto = using the offload feature requires -C lto=fat
-
-codegen_llvm_parse_bitcode = failed to parse bitcode for LTO module
-codegen_llvm_parse_bitcode_with_llvm_err = failed to parse bitcode for LTO module: {$llvm_err}
-
-codegen_llvm_parse_target_machine_config =
-    failed to parse target machine config to target machine: {$error}
-
-codegen_llvm_prepare_autodiff = failed to prepare autodiff: src: {$src}, target: {$target}, {$error}
-codegen_llvm_prepare_autodiff_with_llvm_err = failed to prepare autodiff: {$llvm_err}, src: {$src}, target: {$target}, {$error}
-codegen_llvm_prepare_thin_lto_context = failed to prepare thin LTO context
-codegen_llvm_prepare_thin_lto_context_with_llvm_err = failed to prepare thin LTO context: {$llvm_err}
-
-codegen_llvm_prepare_thin_lto_module = failed to prepare thin LTO module
-codegen_llvm_prepare_thin_lto_module_with_llvm_err = failed to prepare thin LTO module: {$llvm_err}
-
-codegen_llvm_run_passes = failed to run LLVM passes
-codegen_llvm_run_passes_with_llvm_err = failed to run LLVM passes: {$llvm_err}
-
-codegen_llvm_sanitizer_kcfi_arity_requires_llvm_21_0_0 = `-Zsanitizer-kcfi-arity` requires LLVM 21.0.0 or later.
-
-codegen_llvm_sanitizer_memtag_requires_mte =
-    `-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`
-
-codegen_llvm_serialize_module = failed to serialize module {$name}
-codegen_llvm_serialize_module_with_llvm_err = failed to serialize module {$name}: {$llvm_err}
-
-codegen_llvm_symbol_already_defined =
-    symbol `{$symbol_name}` is already defined
-
-codegen_llvm_target_machine = could not create LLVM TargetMachine for triple: {$triple}
-codegen_llvm_target_machine_with_llvm_err = could not create LLVM TargetMachine for triple: {$triple}: {$llvm_err}
-
-codegen_llvm_unknown_debuginfo_compression = unknown debuginfo compression algorithm {$algorithm} - will fall back to uncompressed debuginfo
-
-codegen_llvm_write_bytecode = failed to write bytecode to {$path}: {$err}
-
-codegen_llvm_write_ir = failed to write LLVM IR to {$path}
-codegen_llvm_write_ir_with_llvm_err = failed to write LLVM IR to {$path}: {$llvm_err}
-
-codegen_llvm_write_output = could not write output to {$path}
-codegen_llvm_write_output_with_llvm_err = could not write output to {$path}: {$llvm_err}
-
-codegen_llvm_write_thinlto_key = error while writing ThinLTO key data: {$err}
-codegen_llvm_write_thinlto_key_with_llvm_err = error while writing ThinLTO key data: {$err}: {$llvm_err}

compiler/rustc_codegen_llvm/src/errors.rs

@@ -2,14 +2,12 @@ use std::ffi::CString;
 use std::path::Path;
 
 use rustc_data_structures::small_c_str::SmallCStr;
-use rustc_errors::{Diag, DiagCtxtHandle, Diagnostic, EmissionGuarantee, Level};
+use rustc_errors::{Diag, DiagCtxtHandle, Diagnostic, EmissionGuarantee, Level, inline_fluent};
 use rustc_macros::Diagnostic;
 use rustc_span::Span;
 
-use crate::fluent_generated as fluent;
-
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_symbol_already_defined)]
+#[diag("symbol `{$symbol_name}` is already defined")]
 pub(crate) struct SymbolAlreadyDefined<'a> {
     #[primary_span]
     pub span: Span,
@@ -17,7 +15,7 @@ pub(crate) struct SymbolAlreadyDefined<'a> {
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_sanitizer_memtag_requires_mte)]
+#[diag("`-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`")]
 pub(crate) struct SanitizerMemtagRequiresMte;
 
 pub(crate) struct ParseTargetMachineConfig<'a>(pub LlvmError<'a>);
@@ -27,89 +25,97 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for ParseTargetMachineConfig<'_> {
         let diag: Diag<'_, G> = self.0.into_diag(dcx, level);
         let (message, _) = diag.messages.first().expect("`LlvmError` with no message");
         let message = dcx.eagerly_translate_to_string(message.clone(), diag.args.iter());
-        Diag::new(dcx, level, fluent::codegen_llvm_parse_target_machine_config)
-            .with_arg("error", message)
+        Diag::new(
+            dcx,
+            level,
+            inline_fluent!("failed to parse target machine config to target machine: {$error}"),
+        )
+        .with_arg("error", message)
     }
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_autodiff_component_unavailable)]
+#[diag("failed to load our autodiff backend: {$err}")]
 pub(crate) struct AutoDiffComponentUnavailable {
     pub err: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_autodiff_component_missing)]
-#[note]
+#[diag("autodiff backend not found in the sysroot: {$err}")]
+#[note("it will be distributed via rustup in the future")]
 pub(crate) struct AutoDiffComponentMissing {
     pub err: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_autodiff_without_lto)]
+#[diag("using the autodiff feature requires setting `lto=\"fat\"` in your Cargo.toml")]
 pub(crate) struct AutoDiffWithoutLto;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_autodiff_without_enable)]
+#[diag("using the autodiff feature requires -Z autodiff=Enable")]
 pub(crate) struct AutoDiffWithoutEnable;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_without_enable)]
+#[diag("using the offload feature requires -Z offload=<Device or Host=/absolute/path/to/host.out>")]
 pub(crate) struct OffloadWithoutEnable;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_without_fat_lto)]
+#[diag("using the offload feature requires -C lto=fat")]
 pub(crate) struct OffloadWithoutFatLTO;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_no_abs_path)]
+#[diag("using the `-Z offload=Host=/absolute/path/to/host.out` flag requires an absolute path")]
 pub(crate) struct OffloadWithoutAbsPath;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_no_host_out)]
+#[diag(
+    "using the `-Z offload=Host=/absolute/path/to/host.out` flag must point to a `host.out` file"
+)]
 pub(crate) struct OffloadWrongFileName;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_nonexisting)]
+#[diag(
+    "the given path/file to `host.out` does not exist. Did you forget to run the device compilation first?"
+)]
 pub(crate) struct OffloadNonexistingPath;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_bundleimages_failed)]
+#[diag("call to BundleImages failed, `host.out` was not created")]
 pub(crate) struct OffloadBundleImagesFailed;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_offload_embed_failed)]
+#[diag("call to EmbedBufferInModule failed, `host.o` was not created")]
 pub(crate) struct OffloadEmbedFailed;
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_lto_bitcode_from_rlib)]
+#[diag("failed to get bitcode from object file for LTO ({$err})")]
 pub(crate) struct LtoBitcodeFromRlib {
     pub err: String,
 }
 
 #[derive(Diagnostic)]
 pub enum LlvmError<'a> {
-    #[diag(codegen_llvm_write_output)]
+    #[diag("could not write output to {$path}")]
     WriteOutput { path: &'a Path },
-    #[diag(codegen_llvm_target_machine)]
+    #[diag("could not create LLVM TargetMachine for triple: {$triple}")]
     CreateTargetMachine { triple: SmallCStr },
-    #[diag(codegen_llvm_run_passes)]
+    #[diag("failed to run LLVM passes")]
     RunLlvmPasses,
-    #[diag(codegen_llvm_serialize_module)]
+    #[diag("failed to serialize module {$name}")]
     SerializeModule { name: &'a str },
-    #[diag(codegen_llvm_write_ir)]
+    #[diag("failed to write LLVM IR to {$path}")]
     WriteIr { path: &'a Path },
-    #[diag(codegen_llvm_prepare_thin_lto_context)]
+    #[diag("failed to prepare thin LTO context")]
     PrepareThinLtoContext,
-    #[diag(codegen_llvm_load_bitcode)]
+    #[diag("failed to load bitcode of module \"{$name}\"")]
     LoadBitcode { name: CString },
-    #[diag(codegen_llvm_write_thinlto_key)]
+    #[diag("error while writing ThinLTO key data: {$err}")]
     WriteThinLtoKey { err: std::io::Error },
-    #[diag(codegen_llvm_prepare_thin_lto_module)]
+    #[diag("failed to prepare thin LTO module")]
     PrepareThinLtoModule,
-    #[diag(codegen_llvm_parse_bitcode)]
+    #[diag("failed to parse bitcode for LTO module")]
     ParseBitcode,
-    #[diag(codegen_llvm_prepare_autodiff)]
+    #[diag("failed to prepare autodiff: src: {$src}, target: {$target}, {$error}")]
     PrepareAutoDiff { src: String, target: String, error: String },
 }
 
@@ -119,17 +125,31 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for WithLlvmError<'_> {
     fn into_diag(self, dcx: DiagCtxtHandle<'_>, level: Level) -> Diag<'_, G> {
         use LlvmError::*;
         let msg_with_llvm_err = match &self.0 {
-            WriteOutput { .. } => fluent::codegen_llvm_write_output_with_llvm_err,
-            CreateTargetMachine { .. } => fluent::codegen_llvm_target_machine_with_llvm_err,
-            RunLlvmPasses => fluent::codegen_llvm_run_passes_with_llvm_err,
-            SerializeModule { .. } => fluent::codegen_llvm_serialize_module_with_llvm_err,
-            WriteIr { .. } => fluent::codegen_llvm_write_ir_with_llvm_err,
-            PrepareThinLtoContext => fluent::codegen_llvm_prepare_thin_lto_context_with_llvm_err,
-            LoadBitcode { .. } => fluent::codegen_llvm_load_bitcode_with_llvm_err,
-            WriteThinLtoKey { .. } => fluent::codegen_llvm_write_thinlto_key_with_llvm_err,
-            PrepareThinLtoModule => fluent::codegen_llvm_prepare_thin_lto_module_with_llvm_err,
-            ParseBitcode => fluent::codegen_llvm_parse_bitcode_with_llvm_err,
-            PrepareAutoDiff { .. } => fluent::codegen_llvm_prepare_autodiff_with_llvm_err,
+            WriteOutput { .. } => inline_fluent!("could not write output to {$path}: {$llvm_err}"),
+            CreateTargetMachine { .. } => inline_fluent!(
+                "could not create LLVM TargetMachine for triple: {$triple}: {$llvm_err}"
+            ),
+            RunLlvmPasses => inline_fluent!("failed to run LLVM passes: {$llvm_err}"),
+            SerializeModule { .. } => {
+                inline_fluent!("failed to serialize module {$name}: {$llvm_err}")
+            }
+            WriteIr { .. } => inline_fluent!("failed to write LLVM IR to {$path}: {$llvm_err}"),
+            PrepareThinLtoContext => {
+                inline_fluent!("failed to prepare thin LTO context: {$llvm_err}")
+            }
+            LoadBitcode { .. } => {
+                inline_fluent!("failed to load bitcode of module \"{$name}\": {$llvm_err}")
+            }
+            WriteThinLtoKey { .. } => {
+                inline_fluent!("error while writing ThinLTO key data: {$err}: {$llvm_err}")
+            }
+            PrepareThinLtoModule => {
+                inline_fluent!("failed to prepare thin LTO module: {$llvm_err}")
+            }
+            ParseBitcode => inline_fluent!("failed to parse bitcode for LTO module: {$llvm_err}"),
+            PrepareAutoDiff { .. } => inline_fluent!(
+                "failed to prepare autodiff: {$llvm_err}, src: {$src}, target: {$target}, {$error}"
+            ),
         };
         self.0
             .into_diag(dcx, level)
@@ -139,7 +159,7 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for WithLlvmError<'_> {
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_from_llvm_optimization_diag)]
+#[diag("{$filename}:{$line}:{$column} {$pass_name} ({$kind}): {$message}")]
 pub(crate) struct FromLlvmOptimizationDiag<'a> {
     pub filename: &'a str,
     pub line: std::ffi::c_uint,
@@ -150,32 +170,36 @@ pub(crate) struct FromLlvmOptimizationDiag<'a> {
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_from_llvm_diag)]
+#[diag("{$message}")]
 pub(crate) struct FromLlvmDiag {
     pub message: String,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_write_bytecode)]
+#[diag("failed to write bytecode to {$path}: {$err}")]
 pub(crate) struct WriteBytecode<'a> {
     pub path: &'a Path,
     pub err: std::io::Error,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_copy_bitcode)]
+#[diag("failed to copy bitcode to object file: {$err}")]
 pub(crate) struct CopyBitcode {
     pub err: std::io::Error,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_unknown_debuginfo_compression)]
+#[diag(
+    "unknown debuginfo compression algorithm {$algorithm} - will fall back to uncompressed debuginfo"
+)]
 pub(crate) struct UnknownCompression {
     pub algorithm: &'static str,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_mismatch_data_layout)]
+#[diag(
+    "data-layout for target `{$rustc_target}`, `{$rustc_layout}`, differs from LLVM target's `{$llvm_target}` default layout, `{$llvm_layout}`"
+)]
 pub(crate) struct MismatchedDataLayout<'a> {
     pub rustc_target: &'a str,
     pub rustc_layout: &'a str,
@@ -184,11 +208,11 @@ pub(crate) struct MismatchedDataLayout<'a> {
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_fixed_x18_invalid_arch)]
+#[diag("the `-Zfixed-x18` flag is not supported on the `{$arch}` architecture")]
 pub(crate) struct FixedX18InvalidArch<'a> {
     pub arch: &'a str,
 }
 
 #[derive(Diagnostic)]
-#[diag(codegen_llvm_sanitizer_kcfi_arity_requires_llvm_21_0_0)]
+#[diag("`-Zsanitizer-kcfi-arity` requires LLVM 21.0.0 or later.")]
 pub(crate) struct SanitizerKcfiArityRequiresLLVM2100;

compiler/rustc_codegen_llvm/src/lib.rs

@@ -74,8 +74,6 @@ mod typetree;
 mod va_arg;
 mod value;
 
-rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
-
 pub(crate) use macros::TryFromU32;
 
 #[derive(Clone)]
@@ -241,10 +239,6 @@ impl LlvmCodegenBackend {
 }
 
 impl CodegenBackend for LlvmCodegenBackend {
-    fn locale_resource(&self) -> &'static str {
-        crate::DEFAULT_LOCALE_RESOURCE
-    }
-
     fn name(&self) -> &'static str {
         "llvm"
     }

compiler/rustc_codegen_ssa/src/traits/backend.rs

@@ -37,10 +37,6 @@ pub trait BackendTypes {
 }
 
 pub trait CodegenBackend {
-    /// Locale resources for diagnostic messages - a string the content of the Fluent resource.
-    /// Called before `init` so that all other functions are able to emit translatable diagnostics.
-    fn locale_resource(&self) -> &'static str;
-
     fn name(&self) -> &'static str;
 
     fn init(&self, _sess: &Session) {}

compiler/rustc_interface/src/interface.rs

@@ -455,9 +455,6 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
                 Err(e) => early_dcx.early_fatal(format!("failed to load fluent bundle: {e}")),
             };
 
-            let mut locale_resources = config.locale_resources;
-            locale_resources.push(codegen_backend.locale_resource());
-
             let mut sess = rustc_session::build_session(
                 config.opts,
                 CompilerIO {
@@ -468,7 +465,7 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
                 },
                 bundle,
                 config.registry,
-                locale_resources,
+                config.locale_resources,
                 config.lint_caps,
                 target,
                 util::rustc_version_str().unwrap_or("unknown"),

compiler/rustc_interface/src/util.rs

@@ -361,10 +361,6 @@ pub struct DummyCodegenBackend {
 }
 
 impl CodegenBackend for DummyCodegenBackend {
-    fn locale_resource(&self) -> &'static str {
-        ""
-    }
-
     fn name(&self) -> &'static str {
         "dummy"
     }

tests/ui-fulldeps/codegen-backend/auxiliary/the_backend.rs

@@ -29,10 +29,6 @@ use rustc_session::config::OutputFilenames;
 struct TheBackend;
 
 impl CodegenBackend for TheBackend {
-    fn locale_resource(&self) -> &'static str {
-        ""
-    }
-
     fn name(&self) -> &'static str {
         "the-backend"
     }