gdb 8.3: "handler for the OSI ABI "FreeBSD" is not built into this configuration"

[Martin Simmons]

Hi Chris,

Please post of the full output (including all start up messages) of
running gdb 9.1 with the llvm-tblgen core file and the gdb commands

info all
where

__Martin


>>>>> On Sat, 23 May 2020 19:55:05 -0600, Chris Nicol said:
> 
> Thanks, Martin. Yes, when the gdb_6.1.1 did not work, I first had a look 
> to build the 9.1 in /usr/ports/devel/gdb, but the Makefile indicates 
> NOT_FOR_ARCHS= sparc64, and a comment above it "untested on sparc64, 
> might work". Not encouraged, I went on to build the 9.1 from the gnu 
> source. Maybe I will try the /usr/ports version if I comment out the 
> NOT_FOR_ARCHS, since there might be some tweaks in there that is 
> specific to FreeBSD.
> 
> I will also try what you are suggesting below. Hard to track down the 
> llvm-tblgen problem when I can't debug why it is seg. faulting... and 
> getting some help on the llvm list has been pretty fruitless.
> 
> Chris.
> 
> On 5/23/2020 4:17 PM, Martin Simmons wrote:
> > Hi Chris,
> > 
> > Yes, the architecture is detected from the binary if given, otherwise it
> > defaults to the main architecture.
> > 
> > BTW, have you tried building devel/gdb from the /usr/ports tree?  That
> > is the normal way to get any specific tweaks that the FreeBSD project
> > already knows about.
> > 
> > I can't give you comprehensive instructions on how to debug the nested
> > gdb.  I think you should start by looking at the function
> > gdbarch_init_osabi in gdb/osabi.c to see what it does.  In summary, it
> > is looking in the list gdb_osabi_handler_list for something that matches
> > the argument named info.  It only finds a match if the osabi is the same
> > and it has an acceptable arch_info (the function can_run_code_for).  It
> > prints the warning if it doesn't find a match.
> > 
> > The command sequence to start debugging it is something like this:
> > 
> > break gdbarch_init_osabi
> > run
> > 
> > It should then stop at the breakpoint, where it is useful to do:
> > 
> > print info
> > print *info.bfd_arch_info
> > set $tmp=gdb_osabi_handler_list
> > while $tmp
> > print *$tmp
> > print *$tmp->arch_info
> > set $tmp=$tmp->next
> > end
> > 
> > That might be enough to find why there is no match, but otherwise you
> > have to repeatedly use the step command and print other things that the
> > code is examining.
> > 
> > __Martin
> 
> 
> -- 
> ______________________________________________________________________
> Dr. Christopher J. Nicol,               Phone:          (403) 329-2261
> University Librarian and                FAX:            (403) 329-2234
> Professor of Economics,
> The University of Lethbridge,           E-Mail:        nicolc@uleth.ca
> Lethbridge, Alberta, T1K 3M4, CANADA.   http://people.uleth.ca/~nicolc
>