[LLVMdev] [patch] DwarfDebug problem with line section

[Artur Pietrek]

Hi all,
While implementing debug info for our backend, we've noticed a problem with
debug_line section. We believe that the following code is wrong:

// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section. It is always zero when only one
// compile unit is emitted in one object file.
addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);

After compiling several files and linking them together (not only using our
backend, but also x86) debug information was incorrect.
I'm not 100% sure if this fix is correct, but patch attached.

Artur
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