paleolimbot opened a new issue, #1705:
URL: https://github.com/apache/arrow-adbc/issues/1705
### What happened?
We have a note from CRAN that fmt is apparently misusing character traits
(or maybe we are instantiating the template) in very new versions of clang.
```
In file included from
/usr/local/clang18/bin/../include/c++/v1/string_view:213:
/usr/local/clang18/bin/../include/c++/v1/__fwd/string_view.h:22:41: warning:
'char_traits<fmt::detail::char8_type>' is deprecated: char_traits<T> for T not
equal to char, wchar_t, char8_t, char16_t or char32_t is non-standard and is
provided for a temporary period. It will be removed in LLVM 19, so please
migrate off of it. [-Wdeprecated-declarations]
22 | template <class _CharT, class _Traits = char_traits<_CharT> >
| ^
../src/c/vendor/fmt/include/fmt/core.h:361:26: note: in instantiation of
default argument for 'basic_string_view<fmt::detail::char8_type>' required here
361 | template <typename Char> using std_string_view =
std::basic_string_view<Char>;
| ^~~~~
../src/c/vendor/fmt/include/fmt/core.h:452:50: note: in instantiation of
template type alias 'std_string_view' requested here
452 | S,
detail::std_string_view<Char>>::value)>
| ^
../src/c/vendor/fmt/include/fmt/format.h:737:57: note: in instantiation of
template class 'fmt::basic_string_view<fmt::detail::char8_type>' requested here
737 | inline auto compute_width(basic_string_view<char8_type> s) -> size_t
{
| ^
/usr/local/clang18/bin/../include/c++/v1/__string/char_traits.h:81:8: note:
'char_traits<fmt::detail::char8_type>' has been explicitly marked deprecated
here
81 | struct _LIBCPP_DEPRECATED_(
| ^
/usr/local/clang18/bin/../include/c++/v1/__config:975:53: note: expanded
from macro '_LIBCPP_DEPRECATED_'
975 | # define _LIBCPP_DEPRECATED_(m)
__attribute__((__deprecated__(m)))
| ^
1 warning generated.
```
(Full details:
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-clang/adbcpostgresql-00install.html
)
### How can we reproduce the bug?
`cd r/adbcpostgresql && R CMD INSTALL .` on a very new (17 or 18 I think)
clang
### Environment/Setup
_No response_
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