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Description
In libc++ 19.0.0 release notes (https://releases.llvm.org/19.1.0/projects/libcxx/docs/ReleaseNotes.html):
The base template for
std::char_traits
has been removed in LLVM 19. If you are usingstd::char_traits
with types other thanchar
,wchar_t
,char8_t
,char16_t
,char32_t
or a custom character type for which you specializedstd::char_traits
, your code will stop working. The Standard does not mandate that a base template is provided, and such a base template is bound to be incorrect for some types, which could currently cause unexpected behavior while going undetected.
In NixOS, this is creating build failures for us when building cpp-netlib-0.13.0-final
with clang:
In file included from /tmp/nix-build-cpp-netlib-0.13.0-final.drv-0/source/libs/network/src/server_request_parsers_impl.cpp:10:
In file included from /tmp/nix-build-cpp-netlib-0.13.0-final.drv-0/source/boost/network/protocol/http/server/impl/parsers.ipp:5:
In file included from include/boost/spirit/include/qi.hpp:16:
In file included from include/boost/spirit/home/qi.hpp:14:
...
...
In file included from /nix/store/kx521w0j19ssvmcw8gfziiszjgm2bf8x-libcxx-19.1.7-dev/include/c++/v1/__format/parser_std_format_spec.h:39:
/nix/store/kx521w0j19ssvmcw8gfziiszjgm2bf8x-libcxx-19.1.7-dev/include/c++/v1/string:2538:5: error: implicit instantiation of undefined template 'std::char_traits<unsigned int>'
but I note that in your main
it has been relocated to the above file with minimal changes so you're likely to have the same issues.