From eae69d81bc730cdde441312201d3a00f3b87ef34 Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Wed, 19 Aug 2026 14:49:31 +0200
Subject: [PATCH] Add file path to some archive build errors

This would have been useful to have while debugging a problem in cg_clif.
---
 .../rustc_codegen_ssa/src/back/archive.rs     | 20 +++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/compiler/rustc_codegen_ssa/src/back/archive.rs b/compiler/rustc_codegen_ssa/src/back/archive.rs
index c4107b4a60f27..6c4575caebd8e 100644
--- a/compiler/rustc_codegen_ssa/src/back/archive.rs
+++ b/compiler/rustc_codegen_ssa/src/back/archive.rs
@@ -623,8 +623,9 @@ impl<'a> ArArchiveBuilder<'a> {
                             io::Error::new(
                                 io::ErrorKind::InvalidData,
                                 format!(
-                                    "archive member at offset {start} with size {} \
+                                    "archive member of {} at offset {start} with size {} \
                                          exceeds archive size {} in `{}`",
+                                    src_archive.0.display(),
                                     file_range.1,
                                     archive_data.len(),
                                     src_archive.0.display(),
@@ -642,11 +643,18 @@ impl<'a> ArArchiveBuilder<'a> {
                     }
                 }
                 ArchiveEntrySource::File(file) => unsafe {
-                    let mmap = Mmap::map(
-                        File::open(file)
-                            .map_err(|err| io_error_context("failed to open object file", err))?,
-                    )
-                    .map_err(|err| io_error_context("failed to map object file", err))?;
+                    let mmap = Mmap::map(File::open(&file).map_err(|err| {
+                        io_error_context(
+                            &format!("failed to open object file {}", file.display()),
+                            err,
+                        )
+                    })?)
+                    .map_err(|err| {
+                        io_error_context(
+                            &format!("failed to map object file {}", file.display()),
+                            err,
+                        )
+                    })?;
                     if entry.kind == ArchiveEntryKind::RustObj
                         && let Some(sym) = &symbols
                     {