Re: symtab.c change breaks assembly lang debugging

[Daniel Jacobowitz <drow@mvista.com>]

On Fri, Nov 16, 2001 at 12:15:07PM -0800, Michael Snyder wrote:
> 
> Jim, 
> 
> I presume the change below was meant as an optimization, but it's
> based on a false assumption -- that you can't have line numbers
> if you don't have block symbols.  That premise is untrue if you
> are debugging assembly language source, where the assembler emits
> line syms but not block syms.  This change breaks the test case
> for assembly source debugging, gdb.asm/asm-source.exp.
> 
> You would not have noticed, because that test only works on a few
> targets right now (d10v being one of them).
> 
> 	Patch from Peter Schauer:
> 
> 	* symtab.c (find_pc_sect_line): If we can't find the function
> 	containing PC, we certainly won't have line number information for
> 	that location, so return zero immediately.

<sigh>

OK, I should have thought of that.  The problem is that this almost
always indicates a lack of debugging information, and GDB historically
copes very badly with not having any debugging information available. 
Aside from Jim's address range cleanups, which are certainly a good
solution for the cases they can handle, I don't know what to do about
this.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer