[Bug translator/13420] prologue detection fails for unoptimized 64bit cast-scope.exp testcase

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13420

--- Comment #1 from Mark Wielaard <mjw at redhat dot com> 2011-11-21 12:43:12 UTC ---
BTW. GCC still doesn't emit real prologue markers in the line table.
See gcc/dwarf2out.c (dwarf2out_source_line):

  /* ??? TODO: Elide duplicate line number entries.  Traditionally,
     the debugger has used the second (possibly duplicate) line number
     at the beginning of the function to mark the end of the prologue.
     We could eliminate any other duplicates within the function.  For
     Dwarf3, we ought to include the DW_LNS_set_prologue_end mark in
     that second line number entry.  */

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