Re: C++ error

[Fredrik Salomonsson]

Hi,

Laurent Gatto <laurent.gatto@gmail.com> writes:

> Hi Fredrik,
>
> Thank you for taking the time looking into this.

No worries.

>
> My issue doesn't seem to be related to an old gcc version.
>
> ```
> $ g++ --version
> g++ (GCC) 14.2.0
> Copyright (C) 2024 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> ```
>
> My location is different though
>
> ```
> $ which g++
> /home/lgatto/.guix-profile/bin/g++
> ```
> Checking the stdc++ lib:
>
> ```
> $ sed -n '3154p' ~/.guix-profile/include/c++/type_traits
>   _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead")
> ```
>
> And the gcc search paths on my machine:
>
> ```
> $ echo | g++ -E -Wp,-v -
> ignoring nonexistent directory "/no-gcc-local-prefix/include"
> ignoring nonexistent directory
> "/gnu/store/ikn0imxfc6n0ba12mrf0c4hc1jm7ylc7-gcc-14.2.0-lib/lib/gcc/x86_64-unknown-linux-gnu/14.2.0/../../../../../../../x86_64-unknown-linux-gnu/include"
> ignoring duplicate directory "/home/lgatto/.guix-profile/include"
>   as it is a non-system directory that duplicates a system directory
> #include "..." search starts here:
> #include <...> search starts here:
>  /home/lgatto/.guix-profile/include
>  
> /gnu/store/ikn0imxfc6n0ba12mrf0c4hc1jm7ylc7-gcc-14.2.0-lib/lib/gcc/x86_64-unknown-linux-gnu/14.2.0/include
>  
> /gnu/store/ikn0imxfc6n0ba12mrf0c4hc1jm7ylc7-gcc-14.2.0-lib/lib/gcc/x86_64-unknown-linux-gnu/14.2.0/include-fixed
>  /gnu/store/zvlp3n8iwa1svxmwv4q22pv1pb1c9pjq-glibc-2.39/include
> End of search list.
> # 0 "<stdin>"
> # 0 "<built-in>"
> # 0 "<command-line>"
> # 1 "/home/lgatto/.guix-profile/include/stdc-predef.h" 1 3
> # 0 "<command-line>" 2
> # 1 "<stdin>"
> ````
>
> Except for the version and location, all this looks very similar to
> what you have, which leaves me quite puzzled.

Indeed, this is strange.

What does `guix package -I gcc` and `guix package -I stdc\+\+` give you?
Maybe it'll show you some discrepancies.

And if this is any help this is the commit I'm using for guix:

```
$ guix describe
Generation 142  nov 09 2024 12:47:04    (current)
…
  guix 14abf6e
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 14abf6e19e5c24fa690a443f5467e7f0b6eafcc5
```

Note: I removed the other channels I'm using and replaced them with `…`.
None of them defines any gcc related packages so they should not affect
this.

-- 
s/Fred[re]+i[ck]+/Fredrik/g