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Compile the following file:
```
#include <ranges>
int main() {}
```
using:
$ clang++ -std=c++2a file.cpp
You will get an error:
/usr/lib/gcc/x86_64-redhat-linux/11/../../../../include/c++/11/ranges:3466:19: error: missing 'typename' prior to dependent type name 'iterator_traits<iterator_t<_Base>>::iterator_category'
using _Cat = iterator_traits<iterator_t<_Base>>::iterator_category;
This renders clang unusable for any code that includes ranges and compiles with c++20 flags because clang hasn't implemented P0634R3.
The very simple fix is to add Fedora-speciffic patch which simply adds the typename into libstdc++.
(In reply to Marián Konček from comment #0)
> The very simple fix is to add Fedora-speciffic patch which simply adds the
> typename into libstdc++.
No, because Fedora's policy is upstream first (and it's already fixed upstream).
Compile the following file: ``` #include <ranges> int main() {} ``` using: $ clang++ -std=c++2a file.cpp You will get an error: /usr/lib/gcc/x86_64-redhat-linux/11/../../../../include/c++/11/ranges:3466:19: error: missing 'typename' prior to dependent type name 'iterator_traits<iterator_t<_Base>>::iterator_category' using _Cat = iterator_traits<iterator_t<_Base>>::iterator_category; This renders clang unusable for any code that includes ranges and compiles with c++20 flags because clang hasn't implemented P0634R3. The very simple fix is to add Fedora-speciffic patch which simply adds the typename into libstdc++.