PyQt5 build failure on macOS 10.10 and below

[reneeotten at macports.org]

Dear Phil, 


First of: thanks for making the software available! We try to support older macOS versions as much as possible in the MacPorts project (www.macports.org) and the build of PyQt5-5.14.2 currently fails on 10.10 and below due to the following error:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -c -pipe -stdlib=libc++ -isystem/opt/local/include/LegacySupport -I/opt/local/include -Os -std=gnu++11  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -mmacosx-version-min=10.10 -fno-exceptions -Wall -W -fPIC -DPy_LIMITED_API=0x03040000 -DSIP_PROTECTED_IS_PUBLIC -Dprotected=public -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -I. -I.. -I../../qpy/QtQuick -I/opt/local/Library/Frameworks/Python.framework/Versions/3.9/include/python3.9 -I/opt/local/libexec/qt5/lib/QtQuick.framework/Headers -I/opt/local/libexec/qt5/lib/QtGui.framework/Headers -I/opt/local/libexec/qt5/lib/QtQml.framework/Headers -I/opt/local/libexec/qt5/lib/QtNetwork.framework/Headers -I/opt/local/libexec/qt5/lib/QtCore.framework/Headers -I. -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/AGL.framework/Headers -I/opt/local/libexec/qt5/mkspecs/macx-clang -F/opt/local/libexec/qt5/lib -o sipQtQuickQSGGeometry.o sipQtQuickQSGGeometry.cpp
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_python_py-pyqt5/py39-pyqt5/work/PyQt5-5.14.2/build/QtQuick/sipQtQuickQSGGeometry.cpp:940:59: error: object of type 'QSGGeometry' cannot be assigned because its copy assignment operator is implicitly deleted
    reinterpret_cast< ::QSGGeometry *>(sipDst)[sipDstIdx] = *reinterpret_cast< ::QSGGeometry *>(sipSrc);
                                                          ^
/opt/local/libexec/qt5/lib/QtQuick.framework/Headers/qsggeometry.h:207:25: note: copy assignment operator of 'QSGGeometry' is implicitly deleted because field 'm_attributes' is of reference type 'const QSGGeometry::AttributeSet &'
    const AttributeSet &m_attributes;
                        ^
1 error generated.
make[1]: *** [sipQtQuickQSGGeometry.o] Error 1
make: *** [sub-QtQuick-make_first-ordered] Error 2
Command failed:  cd "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_python_py-pyqt5/py39-pyqt5/work/PyQt5-5.14.2" && sip-build-3.9 --qmake /opt/local/libexec/qt5/bin/qmake --verbose --confirm-license --dbus=/opt/local/Library/Frameworks/Python.framework/Versions/3.9/include/python3.9/dbus-1.0 --disable QtWebKit --disable QtWebKitWidgets 
Exit code: 1

The Trac ticket that reported the issue is (https://trac.macports.org/ticket/62009 <https://trac.macports.org/ticket/62009>) and a full, recent build-log can be found here: https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/156111 <https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/156111>. I am not completely sure what the officially supported OSes are and whether this error is something that seems familiar to you and/or fixable, but would appreciate your input here! 

Thanks and with best regards, 
Renee
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