[llvm-bugs] [Bug 43763] New: In Dwarf output, source path not recognized in gdb if built from parallel folder hierarchy

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https://bugs.llvm.org/show_bug.cgi?id=43763

            Bug ID: 43763
           Summary: In Dwarf output, source path not recognized in gdb if
                    built from parallel folder hierarchy
           Product: new-bugs
           Version: 9.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: sylvain.audi at ubisoft.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

This bug was detected when cross compiling for linux on windows, but it
probably is reproduceable from linux directly.


It happens when we build a file from a subdirectory paallel to that file, the
output obj file is not recognized directly by gdb.


Repro (from the zip file attached):
1) on windows, run build.bat
2) now under linux, using the 2 output obj files:

$ gdb main.obj
GNU gdb (GDB) 8.3
(etc... skipping gdb the header)
Reading symbols from main.obj...
(gdb) b main.cpp:1
Breakpoint 1 at 0xd: file source\sourcesubdir/main.cpp, line 3.
(gdb) quit
$
$ gdb mainsub.obj
GNU gdb (GDB) 8.3
(etc... skipping gdb the header)
Reading symbols from mainsub.obj...
(gdb) b main.cpp:1
No source file named main.cpp.         <=== PROBLEM HERE
Make breakpoint pending on future shared library load? (y or [n])
(gdb)
(gdb) b source\sourcesubdir\main.cpp:1
Breakpoint 1 at 0xd: file
D:\saudi\clang_bug_final/source\sourcesubdir\main.cpp, line 3.


Note 1:
build.bat runs the same command line using absolute paths from 2 different
folder : 
a) a folder that is an ancestor of the cpp file
b) a folder that is parallel to the hierarchy of the cpp file (bug scenario)


Note 2:
The problem seems to be in MCDwarf.cpp, in CDwarfLineTableHeader::tryGetFile.
The code paths change between the 2 scenarios, as Directory == CompilationDir
on one (the one that works) and not on the other.

Note 3:
Is this maybe somewhat related with bug 39503?

Note 4:
The bug doesn't appear when trying with g++

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