[llvm-bugs] [Bug 28697] New: 'invalid subroutine type ref' when linking with custom meta data

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28697

            Bug ID: 28697
           Summary: 'invalid subroutine type ref' when linking with custom
                    meta data
           Product: new-bugs
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: robin at icir.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

With the code below, it looks like llvm-link merges the debug information in
b.ll with the custom metadata in a.ll. Is that a bug, or am I missing
something? This is with a current 3.9.0 version.

# cat cat a.ll
define void @a() {
  ret void
}

!bar = !{!3}

!3 = !{void ()* @a}

# cat b.ll
define void @foo() !dbg !20 {
  ret void
}

!llvm.module.flags = !{!17, !18}

!0 = distinct !DICompileUnit(language: DW_LANG_C89, file: !1)
!1 = !DIFile(filename: "x.c", directory: "/tmp")
!17 = !{i32 2, !"Dwarf Version", i32 4}
!18 = !{i32 2, !"Debug Info Version", i32 3}
!20 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 92, type:
!21, unit: !0)
!21 = !DISubroutineType(types: !22)
!22 = !{null}
!23 = !{}

# llvm-link -o out a.ll b.ll
invalid subroutine type ref
!5 = !DISubroutineType(types: !0)
!0 = !{void ()* @a}
void ()* @a
All DICompileUnits must be listed in llvm.dbg.cu
llvm-link: error: linked module is broken!

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