Re: gdb 8.x - g++ 7.x compatibility

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

On 4 February 2018 at 19:17, Martin Sebor wrote:
> I think this message would be the most meaningful if the "auto"
> part were replaced with the deduced type.  With that, the suffix
> of the constant isn't important, just as in other contexts.
>
> I didn't consider the use of auto as a template parameter but
> I don't think it changes anything.  There, just like in other
> contexts, what's important is the deduced types and the values
> of constants, not the minute details of how they are spelled.
>
> That said, it wasn't my intention to make things difficult for
> the debugger.  But changing GCC back to include the suffix,
> even just in the debug info, isn't a solution.  There are other
> compilers besides GCC that don't emit the suffixes, and there
> even are some that prepend a cast to the number, so if GDB is
> to be usable with all these kinds of producers it needs to be
> able to handle all of these forms.

The change is a little unfortunate, I pointed out the problems for
debuginfo and template<auto> recently in another context:
https://sourceware.org/bugzilla/show_bug.cgi?id=21492#c1

As I said there, simply comparing strings from the debuginfo is
insufficient for Clang anyway. Now it is for GCC too.