Re: RFA: Search for symbol names the same way they're hashed.

[Daniel Jacobowitz <drow@mvista.com>]

On Wed, Oct 02, 2002 at 05:48:01PM -0700, Jim Ingham wrote:
> 
> On Wednesday, October 2, 2002, at 02:50  PM, 
> gdb-patches-digest-help@sources.redhat.com wrote:
> 
> >>We need to make demangling-style only affect *printout* and *user
> >>entered strings*, and during symbol reading, force it to auto, so it
> >>always gets the right names in the symbol table in the first place.
> >
> >Doesn't that sort of defeat the point of letting the user set
> >demangling style?  It's in case something goes wrong with
> >autodetection....
> >
> >>>The source code name of a symbol does not depend depend on the 
> >>>current
> >>>demangling setting;
> >>
> >>And to enforce this, you have to make the readers *not* honor the
> >>demangling style. If you just fix SYMBOL_SOURCE_NAME,
> >>SYMBOL_INIT_DEMANGLED_NAME will still be only called once, and it'll
> >>have the wrong demangling style when it calls cplus_demangle, 
> >>resulting
> >>in the symbol having the wrong demangled name forevermore.
> >
> >Perhaps we need to decide what the point of letting users force the
> >demangle style is, first.
> 
> The case where we have had to use this was because we had private C++ 
> API's in some of the Mac OS X frameworks for 10.2 (which was compiled 
> with gcc 3.1) but users who didn't want to move their C++ code to 3.1 
> yet.  When you hit the frameworks, gdb would see _Z, and assume the 
> mangling style was the 3.1 style.  Of course, all their code was 2.95, 
> and they didn't in general care about the C++ stuff in frameworks 
> (Apple tries not to export C++ API's if it can help it).  So forcing 
> demangling to 2.95 was useful in this case.
> 
> This should, hopefully, be just a short term problem.  Very few of our 
> customers are still using 2.95 that we know about.  But it is still 
> worth keeping in mind for the next year or so...

Time to unconfuse one issue:

Jim, are you sure that you are talking about _demangling_ style?  It is
orthogonal to 'set cp-abi'.  I'm talking about 'set demangle-style'
here.  I assume in a mixed v2/v3 environment you'd want 'auto' anyway.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer