[patch] support -gdwarf-2 when creating cygwin1.dbg
Wed Apr 18 13:18:00 GMT 2007
Christopher Faylor wrote:
> Thanks for doing this. Please check in. Can we switch to dwarf-2 by
> default in the cygwin makefile(s)?
I thought about that, but the problem is anything you do to *FLAGS in
winsup/cygwin won't affect flags used in the other dirs like libiberty
or newlib, and so unless you set CXXFLAGS and CFLAGS when you do
toplevel configure, you'll end up with a mish-mash of some stabs and
some DW2 in the .dbg file.
Corinna Vinschen wrote:
> As long as we use a 3.x or 4.0.x gcc it should be ok. Later gcc's
> explicitely switch off the generation of a DW_CFA_offset column in the
> .debug_frame CIE header information, which breaks backtracing in GDB.
Hmm, I think I read something about that on the gcc list. Is this just
a case of gcc switching to doing TheActualRightThing and gdb not having
being updated yet?
> There's an explicit
> #define DWARF2_UNWIND_INFO 0
> in gcc/config/i386/cygming.h right now. The accompanying comment is
Aren't we talking about two different things here? That's for unwinding
during exception handling, but you can still leave that at 0 (and use
--enable-sjlj-exceptions) and still get the benefit of -gdwarf-2 for
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