On Apr 18 08:58, Christopher Faylor wrote: > On Wed, Apr 18, 2007 at 05:44:25AM -0700, Brian Dessent wrote: > >The attached patch allows for dllfixdbg to copy DWARF-2 debug sections > >into the .dbg file. There was also an (accidently?) duplicated section > >in the cygwin.sc linker script that I removed while I was there. > >[...] > Thanks for doing this. Please check in. Can we switch to dwarf-2 by > default in the cygwin makefile(s)?
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. There's an explicit #define DWARF2_UNWIND_INFO 0 in gcc/config/i386/cygming.h right now. The accompanying comment is /* DWARF2 Unwinding doesn't work with exception handling yet. To make it work, we need to build a libgcc_s.dll, and dcrt0.o should be changed to call __register_frame_info/__deregister_frame_info. */ I didn't see any problem with using dwarf2 in Cygwin so far and actually it lets GDB behave much better than with stabs. I'm not fluent enough with this low-level stuff so I don't quite understand what this __register_frame_info/__deregister_frame_info stuff is about. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat
