| Issue |
139466
|
| Summary |
C++23 #include <format> from libstdc++ fails with "variable template ... cannot appear in its own initializer"
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
stbergmann
|
Apparently since <https://github.com/llvm/llvm-project/commit/91f1830cb69cab96201adba6378d64095e251f95> "[Clang][Sema] Handle invalid variable template specialization whose type depends on itself (https://github.com/llvm/llvm-project/pull/134522)": At least when building agaisnt `libstdc++-devel-15.1.1-1.fc42.x86_64`,
```
$ cat test.cc
#include <format>
```
```
$ clang++ -std=c++23 -fsyntax-only test.cc
In file included from test.cc:1:
/usr/lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/format:5165:7: error: variable template 'format_kind' declared with deduced type 'const auto' cannot appear in its own initializer
5165 | format_kind<_Rg> // you can specialize this for non-const input ranges
| ^
1 error generated.
```
(where the` relevant contents of `/usr/include/c++/15/format` is
```
template<typename _Rg>
constexpr auto format_kind =
__primary_template_not_defined(
format_kind<_Rg> // you can specialize this for non-const input ranges
);
```
).
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