https://sourceware.org/bugzilla/show_bug.cgi?id=29393
Nick Clifton <nickc at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |NOTABUG
Status|UNCONFIRMED |RESOLVED
CC| |nickc at redhat dot com
--- Comment #1 from Nick Clifton <nickc at redhat dot com> ---
(In reply to Jan Engelhardt from comment #0)
> I did not find an option to emit v4 CUs. gcc's -gdwarf-4 option has no
> effect in that regard, either.
The secret is that you need to use both gcc's dwarf-4 option and the
assembler's dwarf-4 option. Like this:
$ gcc x.c -g -gdwarf-4 -Wa,--gdwarf-4
$ objdump -W a.out
[...]
Contents of the .debug_info section:
Compilation Unit @ offset 0x0:
Length: 0x4f (32-bit)
Version: 4
Abbrev Offset: 0x0
Pointer Size: 8
You need the assembler's --gdwarf-4 option so that it will default to
generating a version 4 .debug_info section. But you also need to use gcc's
-gdwarf-4 option as otherwise it will generated dwarf version 5 line table
information and the assembler will notice this and automatically bump the
version of dwarf that it generates to version 5.
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