[Bug ld/25561] Incorrect DWARF info emitted when variable removed due to --gc-sections

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25561

--- Comment #3 from Nick Clifton <nickc at redhat dot com> ---
Hi Chris,

> Thanks for the info and context Nick, appreciate it! At a high level I figured
> the linker is already updating "DW_AT_location" today when it determines the
> actual address during the placement process so I figured if the symbol didn't
> get placed, the linker could strip the info instead.

It could - but how much info should it strip ?  Just the DW_AT_location entry
or other bits of debug info as well ?   Plus at the moment the linker does not
really have any code to reformat the contents of a debug section.  It can
resolve
relocations that point into debug sections, and it can discard whole sections,
but
it does not really have debug-rewriting capabilities.

> Do you know if there are any tickets already tracking the suggested gcc 
> changes
> you mentioned? 

Actually no.  I thought that there was one (or even two) but I cannot find them
at the moment.  They were probably filed a long time ago.  It would probably be
worth asking on the gcc mailing list however as there is bound to be someone 
there who knows about this issue.

Cheers
  Nick

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