[LLVMbugs] [Bug 10887] New: Debug Info Metadata gets corrupted after linking .bc files

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10887

           Summary: Debug Info Metadata gets corrupted after linking .bc
                    files
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: barto at gmx.net
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=7242)
 --> (http://llvm.org/bugs/attachment.cgi?id=7242)
Files to reproduce

Windows XP, MSVC 2008
LLVM SVN revision: 138553 
clang SVN revision: 138538

I have as input 2 .ll files (It doesn't matter if they're generated by clang or
my own frontend) After linking them together (either with llvm-link or
llvm::Linker::LinkInFiles), only the first file retains correct
llvm.dbg.declare/metadata. The second file just references null metadata.

Correct:
  call void @llvm.dbg.declare(metadata !{i8** %arg0.addr}, metadata !19), !dbg
!22 

Incorrect:
  call void @llvm.dbg.declare(metadata !18, metadata !29), !dbg !30 
!18 = metadata !{null} 

Attached are 2 repro-cases:
"1.cmd" contains the steps necessary to reproduce behavior with sample files
from my own front-end. Final output file: output1.ll
"2.cmd" contains sample files for clang. Final output file: output2.ll

E.g. in output2.ll you can see correct debug info in lines 10 and 11, and
corrupt in lines 23 and 24.

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