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

From: Roman Popov <ripopov at gmail dot com>
To: Simon Marchi <simon dot marchi at polymtl dot ca>, gdb at sourceware dot org, gcc at gcc dot gnu dot org
Date: Fri, 2 Feb 2018 22:43:24 -0800
Subject: Re: gdb 8.x - g++ 7.x compatibility
Authentication-results: sourceware.org; auth=none
References: <CAATAM3ED7B3wEJFmaZA_MaOtN5EGKSGFmusAf-Mg5hX35D2r6A@mail.gmail.com> <e9442bb24f681516f9726aee31e4c860@polymtl.ca>

2018-02-02 20:54 GMT-08:00 Simon Marchi <simon.marchi@polymtl.ca>:

>
> GCC changed how it outputs unsigned template parameters in the debug info
> (from 2u to just 2), and it doesn't look like it's going to change it
> back.  So I suppose we'll have to find a way to make GDB deal with it.
> Simon
>

I'm not so sure about it. In my opinion it is a gcc bug. 2u and 2 are
literals of different types. But I'm not a C++ expert.

It looks like g++ and clang treat C++ language differently in this case.
I've asked on stackoverflow:
https://stackoverflow.com/questions/48594693/auto-template-parameters-g-7-3-vs-clang-6-0-which-compiler-is-correct

If Clang is correct here, than foo<1u> and foo<1> are two different types.
And so gcc should emit correct postfixes to debuginfo.


-Roman

References:
- gdb 8.x - g++ 7.x compatibility
  - From: Roman Popov
- Re: gdb 8.x - g++ 7.x compatibility
  - From: Simon Marchi

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