[PATCH] D11003: Tolerate DWARF compile unit without filename.

[Paul Robinson]

In http://reviews.llvm.org/D11003#200766, @clayborg wrote:

> DWARF has the notion in its line tables that the primary source file is the first one in the file list of the line table prologue.


I had thought so too, but looking in the specs I don't see any language to confirm that.  In fact DWARF 4 added explicit language that the primary file is the one whose name matches DW_AT_name from the comp unit.  The order in the line table's file list is not specified.

I expect it's _common_ to put the primary file first, but DWARF does not specify that.


http://reviews.llvm.org/D11003