[llvm] r218041 - Always emit DW_AT_declaration attribute when the variable isn't a definition.

[David Blaikie]

Looks like this might've regressed some debug scenarios:

http://lab.llvm.org:8011/builders/clang-x86_64-ubuntu-gdb-75/builds/17377

(could be r218040, but it seems like the less likely candidate of the two
on the blame list)

On Thu, Sep 18, 2014 at 2:38 AM, Frederic Riss <friss at apple.com> wrote:

> Author: friss
> Date: Thu Sep 18 04:38:23 2014
> New Revision: 218041
>
> URL: http://llvm.org/viewvc/llvm-project?rev=218041&view=rev
> Log:
> Always emit DW_AT_declaration attribute when the variable isn't a
> definition.
>
> Summary:
> This doesn't show up today as we don't emit decalration only variables.
> This
> will be tested when the followup patches implementing import of forward
> declared entities lands in clang.
>
> Reviewers: echristo, dblaikie, aprantl
>
> Subscribers: llvm-commits
>
> Differential Revision: http://reviews.llvm.org/D5382
>
> Modified:
>     llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
>
> Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp?rev=218041&r1=218040&r2=218041&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp (original)
> +++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp Thu Sep 18 04:38:23
> 2014
> @@ -1670,6 +1670,9 @@ void DwarfCompileUnit::createGlobalVaria
>        DD->addArangeLabel(SymbolCU(this, Sym));
>        addOpAddress(*Loc, Sym);
>      }
> +    // A static member's declaration is already flagged as such.
> +    if (!SDMDecl.Verify() && !GV.isDefinition())
> +      addFlag(*VariableDIE, dwarf::DW_AT_declaration);
>      // Do not create specification DIE if context is either compile unit
>      // or a subprogram.
>      if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
> @@ -1678,9 +1681,6 @@ void DwarfCompileUnit::createGlobalVaria
>        VariableSpecDIE = &createAndAddDIE(dwarf::DW_TAG_variable, UnitDie);
>        addDIEEntry(*VariableSpecDIE, dwarf::DW_AT_specification,
> *VariableDIE);
>        addBlock(*VariableSpecDIE, dwarf::DW_AT_location, Loc);
> -      // A static member's declaration is already flagged as such.
> -      if (!SDMDecl.Verify())
> -        addFlag(*VariableDIE, dwarf::DW_AT_declaration);
>      } else {
>        addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
>      }
>
>
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