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cg_llvm: split dwarf filename and comp dir

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llvm-dwp concatenates `DW_AT_comp_dir` with `DW_AT_GNU_dwo_name` (only
when `DW_AT_comp_dir` exists), which can result in it failing to find
the DWARF object files.

In earlier testing, `DW_AT_comp_dir` wasn't present in the final
object and the current directory was the output directory.

When running tests through compiletest, the working directory of the
compilation is different from output directory and that resulted in
`DW_AT_comp_dir` being in the object file (and set to the current
working directory, rather than the output directory), and
`DW_AT_GNU_dwo_name` being set to the full path (rather than just
the filename), so llvm-dwp was failing.

This commit changes the compilation directory provided to LLVM to match
the output directory, where DWARF objects are output; and ensures that
only the filename is used for `DW_AT_GNU_dwo_name`.

Signed-off-by: David Wood <david@davidtw.co>
This commit is contained in:
David Wood 2020-11-08 17:17:37 +00:00
parent 99ad915e32
commit ee073b5ec5
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GPG key ID: 2592E76C87381FD9
5 changed files with 21 additions and 8 deletions
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2
compiler/rustc_codegen_llvm/src/back/lto.rs
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@ -734,7 +734,7 @@ pub unsafe fn optimize_thin_module(
let module_name = &thin_module.shared.module_names[thin_module.idx];
let split_dwarf_file = cgcx
.output_filenames
.split_dwarf_file(cgcx.split_dwarf_kind, Some(module_name.to_str().unwrap()));
.split_dwarf_filename(cgcx.split_dwarf_kind, Some(module_name.to_str().unwrap()));
let tm_factory_config = TargetMachineFactoryConfig { split_dwarf_file };
let tm =
(cgcx.tm_factory)(tm_factory_config).map_err(|e| write::llvm_err(&diag_handler, &e))?;