Reported build failure on OS X

[Phillip Johnston]

Build failure reported from #38. This does not reproduce locally for me - suspect related to a MacOS or XCode version difference.

% make
[54/137] Compiling C++ object examples/cpp/libdispatch_threadx_stdmutex.a.p/dispatch_threadx_stdmutex.cpp.o
FAILED: examples/cpp/libdispatch_threadx_stdmutex.a.p/dispatch_threadx_stdmutex.cpp.o 
clang++ -Iexamples/cpp/libdispatch_threadx_stdmutex.a.p -Iexamples/cpp -I../examples/cpp -I../examples/rtos -Iexamples/libcpp -I../examples/libcpp -fcolor-diagnostics -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++17 -g -Wno-unknown-pragmas -fno-rtti -fno-exceptions -fno-unwind-tables -DTHREADX=1 -D_LIBCPP_NO_EXCEPTIONS -DTHREADING=1 -D_LIBCPP_HAS_THREAD_API_EXTERNAL -fno-builtin -static -nodefaultlibs -MD -MQ examples/cpp/libdispatch_threadx_stdmutex.a.p/dispatch_threadx_stdmutex.cpp.o -MF examples/cpp/libdispatch_threadx_stdmutex.a.p/dispatch_threadx_stdmutex.cpp.o.d -o examples/cpp/libdispatch_threadx_stdmutex.a.p/dispatch_threadx_stdmutex.cpp.o -c ../examples/cpp/dispatch_threadx_stdmutex.cpp
In file included from ../examples/cpp/dispatch_threadx_stdmutex.cpp:1:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/functional:504:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/memory:681:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/atomic:1537:12: error: use of undeclared identifier '__libcpp_thread_poll_with_backoff'
    return __libcpp_thread_poll_with_backoff(__test_fn, __backoff_fn);
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/atomic:1570:12: note: in instantiation of function template specialization 'std::__1::__cxx_atomic_wait<const volatile std::__1::__cxx_atomic_impl<bool>, std::__1::__cxx_atomic_wait_test_fn_impl<const volatile std::__1::__cxx_atomic_impl<bool>, bool> &>' requested here
    return __cxx_atomic_wait(__a, __test_fn);
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/atomic:2512:10: note: in instantiation of function template specialization 'std::__1::__cxx_atomic_wait<const volatile std::__1::__cxx_atomic_impl<bool>, bool>' requested here
        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
         ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/atomic:1537:12: error: use of undeclared identifier '__libcpp_thread_poll_with_backoff'
    return __libcpp_thread_poll_with_backoff(__test_fn, __backoff_fn);
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/atomic:1570:12: note: in instantiation of function template specialization 'std::__1::__cxx_atomic_wait<const std::__1::__cxx_atomic_impl<bool>, std::__1::__cxx_atomic_wait_test_fn_impl<const std::__1::__cxx_atomic_impl<bool>, bool> &>' requested here
    return __cxx_atomic_wait(__a, __test_fn);
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/atomic:2515:10: note: in instantiation of function template specialization 'std::__1::__cxx_atomic_wait<const std::__1::__cxx_atomic_impl<bool>, bool>' requested here
        {__cxx_atomic_wait(&__a_, _LIBCPP_ATOMIC_FLAG_TYPE(__v), __m);}
         ^
2 errors generated.
ninja: build stopped: subcommand failed.
make: *** [examples] Error 1

[Russell Owen]

I am running macOS 11.4, XCode 12.5.1, Anaconda python 3.8.8 and a freshly installed version of meson. It is possible that I messed up installing ninja. I thought brew installed it, but when I tried to remove it afterwards I didn't see it in my list of installed packages.