How to build Universal binaries on MacOS?

[crazydef]

Hi,

I've managed to get our MacOS Devops pipeline to build a simple version of srt using the instructions for building on MacOS:

./configure
make

Which seems to work fine. (Outside of me needing to go fishing for the libraries and headers needed for including in a build package.)

But this appears to only build for the architecture of the build machine in question. So I've been trying to build with CMake instead, but without much luck.

I took our Linux build pipeline as a starting point (we also build on Windows in the same way) and added the necessary CMake arguments to build universal binaries:
(New lines for clarity)

cmake -G "Xcode"
      -Wno-dev
      -D CMAKE_OSX_ARCHITECTURES="arm64;x86_64"
      -D CMAKE_BUILD_TYPE=$(Configuration)
      -D USE_CXX_STD=20
      -D ENABLE_STATIC=Off
      -D ENABLE_APPS=Off
      -D ENABLE_ENCRYPTION=Off
      -D CMAKE_INSTALL_BINDIR=$(Build.ArtifactStagingDirectory)/bin
      -D CMAKE_INSTALL_INCLUDEDIR=$(Build.ArtifactStagingDirectory)/include
      -D CMAKE_INSTALL_LIBDIR=$(Build.ArtifactStagingDirectory)/lib
      -D INSTALL_SHARED_DIR=$(Build.ArtifactStagingDirectory)/bin
      -D CMAKE_DEBUG_POSTFIX=.macOS.Debug
      -D CMAKE_RELEASE_POSTFIX=.macOS.Release
xcodebuild -verbose -project SRT.xcodeproj -configuration $(Configuration) -parallelizeTargets

But I'm hitting some linker issues that I haven't been able to figure out:

ld: Undefined symbols:
  std::__1::basic_stringbuf<char, std::__1::char_traits<char>, std::__1::allocator<char>>::str() const, referenced from:
      srt::CUDTUnited::CONID(int) in api.o
      srt::sockaddr_any::str() const in api.o
      srt_logging::LogDispatcher::Proxy::~Proxy() in api.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [71]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [71]) in api.o
      srt::CRcvBuffer::strFullnessState(int, srt::sync::TimePoint<srt::sync::steady_clock> const&) const in buffer_rcv.o
      srt::FixedArray<srt::CRcvBuffer::Entry>::throw_invalid_index(int) const in buffer_rcv.o
      srt::CIPAddress::show(sockaddr const*) in common.o
      srt::CIPAddress::show(sockaddr const*) in common.o
      ...
  std::__1::locale::use_facet(std::__1::locale::id&) const, referenced from:
      srt_logging::LogDispatcher::Proxy::~Proxy() in api.o
      std::__1::basic_ostream<char, std::__1::char_traits<char>>& std::__1::__put_character_sequence[abi:v160006]<char, std::__1::char_traits<char>>(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, char const*, unsigned long) in api.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [71]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [71]) in api.o
      srt::CUDT::tsbpd(void*) in core.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [85]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [85]) in core.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [72]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [72]) in core.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [45]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [45]) in core.o
      ...
  std::__1::ios_base::getloc() const, referenced from:
      srt_logging::LogDispatcher::Proxy::~Proxy() in api.o
      std::__1::basic_ostream<char, std::__1::char_traits<char>>& std::__1::__put_character_sequence[abi:v160006]<char, std::__1::char_traits<char>>(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, char const*, unsigned long) in api.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [71]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [71]) in api.o
      srt::CUDT::tsbpd(void*) in core.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [85]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [85]) in core.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [72]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [72]) in core.o
      void srt_logging::LogDispatcher::PrintLogLine<char const (&) [45]>(char const*, int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, char const (&) [45]) in core.o
      ...
  std::logic_error::logic_error(char const*), referenced from:
      std::length_error::length_error[abi:v160006](char const*) in api.o
      std::out_of_range::out_of_range[abi:v160006](char const*) in api.o

(etc etc... there's a few pages worth of these.)

Obviously all missing symbols are from the C++ standard library, but I haven't been able to figure out exactly what I'm missing.

So, I guess, my question is: What am I missing? :) Or is there a way to pass the necessary CMake command line arguments to configure?