[llvm-bugs] [Bug 34499] New: PDB emission fails with thin-lto

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34499

            Bug ID: 34499
           Summary: PDB emission fails with thin-lto
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: COFF
          Assignee: unassignedbugs at nondot.org
          Reporter: Alberto.Magni at microsoft.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19107
  --> https://bugs.llvm.org/attachment.cgi?id=19107&action=edit
Reproducer

Given the reproducer attached, the following sequence of commands

clang-cl /c /Zi /O2 -flto=thin foo.c
clang-cl /c /Zi /O2 -flto=thin main.c
lld-link /OUT:prog.exe /DEBUG /PDB:prog.pdb /subsystem:CONSOLE /entry:main
foo.obj main.obj

produces this error:

Native PDB Error: The entry already exists.  The specified module already
exists

The following commands, with full LTO, work correctly:

clang-cl /c /Zi /O2 -flto foo.c
clang-cl /c /Zi /O2 -flto main.c
lld-link /OUT:prog.exe /DEBUG /PDB:prog.pdb /subsystem:CONSOLE /entry:main
foo.obj main.obj

I am using:
https://github.com/llvm-mirror/clang.git
3f0db6ed816c5fae9bf6a7b2b1711e8fc57b8589
https://github.com/llvm-mirror/llvm.git
aba02efc6c6441eddd72388638f70cbb17e39b96
https://github.com/llvm-mirror/lld.git:
d470133e80e2090b7281880320ddead759c7fa2d

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