[Bug]: I try use it in IOS and got error

[Hellomik2002]

What Operating System(s) are you seeing this problem on?

macOS (Intel)

dlib version

19.24

Python version

No response

Compiler

Xcode IOS

Expected Behavior

No response

Current Behavior

Failed to build iOS app
Could not build the precompiled application for the device.
Error (Xcode): Undefined symbol: dlib::entropy_decoder_kernel_2::get_target(unsigned int)

Error (Xcode): Undefined symbol: dlib::entropy_decoder_kernel_2::set_stream(std::__1::basic_istream<char, std::__1::char_traits >&)

Error (Xcode): Undefined symbol: dlib::entropy_decoder_kernel_2::decode(unsigned int, unsigned int)

Error (Xcode): Undefined symbol: dlib::entropy_decoder_kernel_2::entropy_decoder_kernel_2()

Error (Xcode): Undefined symbol: dlib::entropy_decoder_kernel_2::~entropy_decoder_kernel_2()

Error (Xcode): Undefined symbol: dlib::base64::base64()

Error (Xcode): Undefined symbol: dlib::base64::~base64()

Error (Xcode): Undefined symbol: dlib::base64::decode(std::__1::basic_istream<char, std::__1::char_traits >&, std::__1::basic_ostream<char, std::__1::char_traits >&) const

Error (Xcode): Linker command failed with exit code 1 (use -v to see invocation)

Steps to Reproduce

Follow https://stackoverflow.com/questions/34591254/how-to-build-dlib-for-ios/35058969#35058969

Anything else?

No response

[Rudd-O]

Similar issue affects Fedora 44:

[2026-03-22T14:26:58.531Z] /builddir/build/BUILD/dlib-20.0-build/dlib-20.0/dlib/test/string.cpp:148:59: error: use of deleted function ‘std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const wchar_t*) [with _Traits = char_traits<char>]’

[2026-03-22T14:26:58.531Z]   148 |         DLIB_TEST_MSG( (left_substr(ws,L".") == L"file"), L"");

The basic_ostream function with those parameters appears to have been deleted? STDLIB 16 for the record.

Easily reproducible inside a Fedora 44 toolbox container.