[Bug 28017] New: error: failed to load objectfile for static-linking archives?

Bug ID 28017
Summary error: failed to load objectfile for static-linking archives?
Product lldb
Version 3.6
Hardware Macintosh
OS MacOS X
Status NEW
Severity normal
Priority P
Component All Bugs
Assignee lldb-dev@lists.llvm.org
Reporter chris+llvm@qwirx.com
CC llvm-bugs@lists.llvm.org
Classification Unclassified

I'm having trouble debugging my application with LLDB on Mac because it seems
to fail to find some of the compiled object files, which are inside a static
link library (.a file). Objects which are compiled directly into the binary
seem to be OK.

I get errors like this when I first try to access line-level information:

(lldb) l BackupStoreFile.cpp
error: backupstore.a(BackupStoreFile.o) failed to load objfile for
/Users/chris/projects/2004/boxi/bb-git/bin/bbackupquery/../../debug/lib/backupstore/backupstore.a
error: backupstore.a(BackupCommands.o) failed to load objfile for
/Users/chris/projects/2004/boxi/bb-git/bin/bbackupquery/../../debug/lib/backupstore/backupstore.a
...
error: common.a(autogen_CommonException.o) failed to load objfile for
/Users/chris/projects/2004/boxi/bb-git/bin/bbackupquery/../../debug/lib/common/common.a
error: Could not find source file "BackupStoreFile.cpp".

I suspect that either lldb does not fully understand the .a archive format, or
another bug prevents it from locating the correct object file inside the
archive. It is definitely there:

chris@Chriss-MacBook-Pro(backupstorepatch)$ ar t
/Users/chris/projects/2004/boxi/bb-git/bin/bbackupquery/../../debug/lib/backupstore/backupstore.a
__.SYMDEF
BackupAccountControl.o
...
BackupStoreDirectory.o
BackupStoreFile.o
BackupStoreFileCmbDiff.o
...