https://sourceware.org/bugzilla/show_bug.cgi?id=27387

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.37

--- Comment #12 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Nick Clifton from comment #9)
> Hmmm, although this 
> would not explain all of the mysterious .debug_macro.dwo sections.

I realize now what this is.

This is the work of optimize_macinfo_range in gcc/dwarf2.out.c:
...
/* Attempt to make a sequence of define/undef macinfo ops shareable with        
   other compilation unit .debug_macinfo sections.  IDX is the first            
   index of a define/undef, return the number of ops that should be             
   emitted in a comdat .debug_macinfo section and emit                          
   a DW_MACRO_import entry referencing it.                                      
   If the define/undef entry should be emitted normally, return 0.  */

static unsigned
optimize_macinfo_range (unsigned int idx, vec<macinfo_entry, va_gc> *files,
                        macinfo_hash_type **macinfo_htab)
...

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