Re: GDB PATCH to disable specific G++ demangling

[Daniel Berlin <dan at cgsoftware dot com>]

On 12/19/00 10:02 AM, "Jason Merrill" <jason@redhat.com> wrote:

>>>>>> "Eli" == Eli Zaretskii <eliz@delorie.com> writes:
> 
>>> Date: Mon, 18 Dec 2000 03:42:10 -0500 (EST)
>>> From: Daniel Berlin <dberlin@redhat.com>
>>> 
>>> AUTO_DEMANGLING detects the mangling style automatically, and demangles it
>>> based on that.
>>> This change defaults to doing this, now that we have two very different
>>> demangling styles about to common usage, and we previously defaulted to
>>> assuming we had one of these styles (the old abi mangling) if we
>>> determined it was a gcc compiled program, and we were using dwarf or
>>> stabs.
> 
>> Thanks for the explanations.  I have one question, though: If
>> AUTO_DEMANGLING can detect the mangling style, why was it not used
>> previously?  Why did the previous version trust the fact that it was
>> looking at a GCC-compiled program more than it trusted auto-detection?
> 
> Because there was only the one GCC mangling scheme, so there was no reason
> to be flexible.  And AUTO_DEMANGLING is probably slightly slower.

Yes, by a very small factor.
However, I don't know why this mattered enough for someone to have that code
there.

> 
>> The change had to do with how GCC-compiled programs was recognized.
>> The original code didn't get it right, in the DJGPP case.  I forget
>> the details, but can dust them off, if that's important.
> 
> I don't think it is.
> 
> Jason
>