[Bug gas/28149] debug info with wrong file association

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28149

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |amodra at gmail dot com

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
I can reproduce the comment #3 behaviour only when using -Wa,-gdwarf or similar
gas options when using gcc-10.  gcc-11 and gcc-12 pass -gdwarf-5 to gas.  That
seems to be the source of these problems, which is that -gdwarf* passed to gas
means not only to select the DWARF level but also have gas generate its own
DWARF line info.

So why is gcc passing -gdwarf-5 to gas?  That seems quite silly!  Can't gas
figure the dwarf level out itself?  Note that current gas decides on dwarf5 if
seeing a .file or .loc specifying file 0.

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