[Bug 57308] Cannot load split debug symbols under /usr/lib/debug

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57308

--- Comment #7 from Bernhard Übelacker  ---
My comment 6 is wrong, as there the output contains always
52534453 / "RSDS", and seems part of a singature:

With a notepad.exe configured with plain `--enable-build-id`:
  llvm-readobj-14 --coff-debug-directory notepad.exe
  ...
      PDBSignature: 0x53445352
      PDBGUID: (0C ED DF EF 5F 62 3C 69 FC 6B 7E D7 5F A9 D3 26)
  ...

Therefore a more correct version of comment 6 would be:
  x86_64-w64-mingw32-objcopy --output-target=binary \
    --only-section=.buildid notepad.exe \
    /dev/stdout | xxd -plain -seek 32 -l 16

Unfortunatley a test with `CROSSLDFLAGS=-Wl,--build-id=sha1` instead of
the `--enable-build-id` did also just add a 16 bytes ".buildid" hash.

But it looks like dbghelp.dll ignores currently the ".buildid" section
instead searches for a ".note.gnu.build-id" section.

Therefore I guess currently just the search via filename would work,
if the globaldebugdir lookup would be modified like this:

dlls/dbghelp/module.c
@@ static struct image_file_map* image_locate_debug_link
         lstrcpyW(p, module->real_path);
+        if (!_wcsnicmp(p, L"\??\Z:\", 7))
+            memmove(p, p + 7, (wcslen(p) + 1 - 7) * sizeof(WCHAR));
         slash = p;