Import error creating import library

compiler/rustc_codegen_llvm/src/back/archive.rs

@@ -12,6 +12,7 @@ use std::str;
 use object::read::macho::FatArch;
 
 use crate::common;
+use crate::errors::ErrorCreatingImportLibrary;
 use crate::llvm::archive_ro::{ArchiveRO, Child};
 use crate::llvm::{self, ArchiveKind, LLVMMachineType, LLVMRustCOFFShortExport};
 use rustc_codegen_ssa::back::archive::{ArchiveBuilder, ArchiveBuilderBuilder};
@@ -293,11 +294,10 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
             };
 
             if result == crate::llvm::LLVMRustResult::Failure {
-                sess.fatal(&format!(
-                    "Error creating import library for {}: {}",
+                sess.emit_fatal(ErrorCreatingImportLibrary {
                     lib_name,
-                    llvm::last_error().unwrap_or("unknown LLVM error".to_string())
-                ));
+                    error: llvm::last_error().unwrap_or("unknown LLVM error".to_string()),
+                });
             }
         };
 

compiler/rustc_codegen_llvm/src/errors.rs

@@ -1,5 +1,6 @@
 use rustc_errors::fluent;
 use rustc_errors::DiagnosticBuilder;
+use rustc_macros::SessionDiagnostic;
 use rustc_session::SessionDiagnostic;
 
 pub(crate) enum UnknownCTargetFeature<'a> {
@@ -34,3 +35,10 @@ impl SessionDiagnostic<'_, ()> for UnknownCTargetFeature<'_> {
         }
     }
 }
+
+#[derive(SessionDiagnostic)]
+#[diag(codegen_llvm::error_creating_import_library)]
+pub(crate) struct ErrorCreatingImportLibrary<'a> {
+    pub lib_name: &'a str,
+    pub error: String,
+}

compiler/rustc_error_messages/locales/en-US/codegen_llvm.ftl

@@ -12,3 +12,6 @@ codegen_llvm_rust_feature =
 
 codegen_llvm_unknown_feature_fill_request =
     consider filing a feature request
+
+codegen_llvm_error_creating_import_library =
+    Error creating import library for {$lib_name}: {$error}