Public bug reported:
When compiling with C++11 standard I got an error `-Werror=template-id-cdtor`
which is meant to be emitted with >= C++20 standard
(https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Dialect-Options.html#index-Wtemplate-id-cdtor):
```
mav@mav:~# g++-14 --version
g++-14 (Ubuntu 14.2.0-4ubuntu2~24.04) 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.
mav@mav:~# g++-14 -Wall -Werror -std=gnu++11 main.cpp
main.cpp:3:15: error: template-id not allowed for constructor in C++20
[-Werror=template-id-cdtor]
3 | Example<T>() {};
| ^
main.cpp:3:15: note: remove the ‘< >’
cc1plus: all warnings being treated as errors
```
Bug is in gcc 15.2.1 too (checked on last Fedora).
Ubuntu release:
```
mav@mav:~# lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.3 LTS
Release: 24.04
```
Packages versions:
```
mav@mav:~# apt-cache policy gcc-14
gcc-14:
Installed: 14.2.0-4ubuntu2~24.04
Candidate: 14.2.0-4ubuntu2~24.04
Version table:
*** 14.2.0-4ubuntu2~24.04 500
500 http://archive.ubuntu.com/ubuntu noble-updates/universe amd64
Packages
500 http://security.ubuntu.com/ubuntu noble-security/universe amd64
Packages
100 /var/lib/dpkg/status
14-20240412-0ubuntu1 500
500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages
mav@mav:~# apt-cache policy g++-14
g++-14:
Installed: 14.2.0-4ubuntu2~24.04
Candidate: 14.2.0-4ubuntu2~24.04
Version table:
*** 14.2.0-4ubuntu2~24.04 500
500 http://archive.ubuntu.com/ubuntu noble-updates/universe amd64
Packages
500 http://security.ubuntu.com/ubuntu noble-security/universe amd64
Packages
100 /var/lib/dpkg/status
14-20240412-0ubuntu1 500
500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages
```
Bug is reproducible.
Minimum code example:
```
template <typename T>
class Example {
Example<T>() {};
};
int main() {
return 0;
}
```
Compile with -Wall -Werror. C++ standard can be either not selected or selected
below than 20 (with >= C++20 error is legit).
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2130718
Title:
-Werror=template-id-cdtor error is emitted with C++ standard less than
20
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