Auto merge of #82102 - nagisa:nagisa/fix-dwo-name, r=davidtwco

Set path of the compile unit to the source directory

As part of the effort to implement split dwarf debug info, we ended up
setting the compile unit location to the output directory rather than
the source directory. Furthermore, it seems like we failed to remap the
prefixes for this as well!

The desired behaviour is to instead set the `DW_AT_GNU_dwo_name` to a
path relative to compiler's working directory. This still allows
debuggers to find the split dwarf files, while not changing the
behaviour of the code that is compiling with regular debug info, and not
changing the compiler's behaviour with regards to reproducibility.

Fixes #82074

cc `@alexcrichton` `@davidtwco`

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index 5f8a11ab94e..c224da7885b 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -94,7 +94,7 @@ pub fn create_informational_target_machine(sess: &Session) -> &'static mut llvm:
 pub fn create_target_machine(tcx: TyCtxt<'_>, mod_name: &str) -> &'static mut llvm::TargetMachine {
     let split_dwarf_file = if tcx.sess.target_can_use_split_dwarf() {
         tcx.output_filenames(LOCAL_CRATE)
-            .split_dwarf_filename(tcx.sess.split_debuginfo(), Some(mod_name))
+            .split_dwarf_path(tcx.sess.split_debuginfo(), Some(mod_name))
     } else {
         None
     };