Notifying maintainers:
@markemer for port tesseract.

CI fails on macos-15, but I am pretty sure it is an issue unrelated to the changes in this PR:

2025-01-03T21:13:17.1523590Z Building dependency (10 of 33) 'glib2' with variants '+x11' ... [FAIL]

if this indeed needs std::filesystem and the C++17 as you claim in the description, why don't you request a compiler that is compatible with that? I don't see the need for using mp_libcxx or legacysupport because of this.

@reneeotten If the port uses filesystem, then requiring C++17 compiler won’t suffice for systems using libc++, because the system runtime does not support filesystem (until some later macOS version).

if this indeed needs std::filesystem and the C++17 as you claim in the description, why don't you request a compiler that is compatible with that? I don't see the need for using mp_libcxx or legacysupport because of this.

There already exists a compiler.cxx_standard 2017 directive in the Portfile, so the old compilers that do not support C++17 are blacklisted. On my system it uses MacPorts Clang 16, I think. It has the headers, but by default it links against the version of libc++ that is bundled with the system, which in Mac OS X 10.7 through 10.13 lacks filesystem support (10.6 should work since it does not bundle libc++). Clang/libc++ implements most of std::filesystem as header-only, but __compare and __extension are both defined in path.cpp, so we get linker errors on these OS versions:

Undefined symbols for architecture x86_64:
  "std::__1::__fs::filesystem::path::__extension() const", referenced from:
      __ZNKSt3__14__fs10filesystem4path9extensionB7v160006Ev in unicharset_extractor-unicharset_extractor.o
  "std::__1::__fs::filesystem::path::__compare(std::__1::basic_string_view<char, std::__1::char_traits<char> >) const", referenced from:
      __ZNSt3__14__fs10filesystemeqB7v160006ERKNS1_4pathES4_ in unicharset_extractor-unicharset_extractor.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)