Re: GDB and -gdwarf-5

Jan Kratochvil <[email protected]> Thu, 7 Sep 2017 21:24:47 +0200

Newsgroups	gmane.comp.gdb.devel
Message-ID	<[email protected]>

On Thu, 07 Sep 2017 21:16:44 +0200, Eli Zaretskii wrote:
> I have GCC 6.3.0 installed, and it seems to support DWARF2 version 5
> via the -gdwarf-5 switch.  But I wanted to make sure I really get that
> version of debug info, so I tried "info source" in GDB.  But that
> command doesn't tell the version of DWARF2.  Is there a GDB command
> which does?
> 
> I also tried "objdump --dwarf=info" (Binutils 2.29), but that says the
> DWARF2 version is 4.  So now I'm confused.

Here gcc-6.3.1-1.fc25.x86_64 really accepts -gdwarf-5 but still it does produce
only DWARF 4.  I do not know why.

gcc-7.1.1-3.fc26.x86_64 does produce DWARF 5.

You should really see from objdump/readelf:
  Compilation Unit @ offset 0x0:
   Length:        0x13c (32-bit)
   Version:       5


Jan