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

[bernd.edlinger at hotmail dot de]

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

            Bug ID: 28149
           Summary: debug info with wrong file association
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: bernd.edlinger at hotmail dot de
  Target Milestone: ---

This was reported as gcc bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101575
but can also be seen as a gas bug, which means, that the
test-case defs.adb/defs.ads from a gdb testcase
https://sourceware.org/git/?p=binutils-gdb.git;a=tree;f=gdb/testsuite/gdb.ada/formatted_ref
(when compiled with -gdwarf-4)
has some mixed entries in the line table,
that is the source file from the .file <n> directive,
but line numbers from the assembler file.
That is due to

gas/dwarf2dbg.c

  if (num_of_auto_assigned)
    {
      /* Clear slots auto-assigned before the first .file <NUMBER>
         directive was seen.  */
      if (files_in_use != (num_of_auto_assigned + 1))
        abort ();
      for (i = 1; i < files_in_use; i++)
        files[i].filename = NULL;
      files_in_use = 0;
      num_of_auto_assigned = 0;
    }

so the previous file(s) are replaced with new files,
but the previous line data remain, and reference an
unrelated new file from the .file directive.

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