qt5-qtconnectivity @5.12.4: failed to build on macOS 10.15 public beta (19A526h)

[OceanS2000 (Ocean Shen)]

The macOS 10.15 SDK shipped with Xcode command line tools beta breaks build of qt5-qtconnectivity with an ambiguous cast.

The build log is attached.

[mf2k (Frank Schima)]

In the future, please add the port maintainer(s) to Cc (port info --maintainers qt5-qtconnectivity), if any.

[OceanS2000 (Ocean Shen)]

Sorry for not including cc field.

I tried to hack the Make to use clang-8.0 from MacPorts to build the module with upstream source, but failed with the same error. Maybe an upstream issue here?

/opt/local/bin/clang++-mp-8.0 -c -include.pch/release/QtBluetooth/objective-c++_x86_64 -pipe -stdlib=libc++ -O2 -std=c++1y -fapplication-extension  -arch x86_64 -isysroot /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -mmacosx-version-min=10.12 -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Winconsistent-missing-override -Wobjc-interface-ivars -Wobjc-method-access -Wobjc-multiple-method-names -Werror=unguarded-availability -Werror=unguarded-availability-new -Werror=unsupported-availability-guard -fPIC -DQT_NO_FOREACH -DQT_OSX_BLUETOOTH -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_BUILD_BLUETOOTH_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_CORE_LIB -DQT_CONCURRENT_LIB -DQT_CORE_LIB -I. -I../../include -I../../include/QtBluetooth -I../../include/QtBluetooth/5.12.4 -I../../include/QtBluetooth/5.12.4/QtBluetooth -I/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtCore.framework/Headers/5.12.4 -I/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtCore.framework/Headers/5.12.4/QtCore -I/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtCore.framework/Headers -I/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtConcurrent.framework/Headers -I.moc/release -I/usr/local/opt/openssl/include -I/Users/<user>/Code/Qt512/5.12.4/clang_64/mkspecs/macx-clang -F/Users/<user>/Code/Qt512/5.12.4/clang_64/lib -o .obj/release/osxbtperipheralmanager.o osx/osxbtperipheralmanager.mm
osx/osxbtperipheralmanager.mm:343:9: error: conversion from
      'ObjCScopedPointer<CBPeripheralManager>' to 'bool' is ambiguous
    if (manager)
        ^~~~~~~
osx/osxbtutility_p.h:86:5: note: candidate function
    operator T*() const
    ^
/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtCore.framework/Headers/qscopedpointer.h:132:5: note:
      candidate function
    operator RestrictedBool() const Q_DECL_NOTHROW
    ^
osx/osxbtperipheralmanager.mm:408:5: error: conversion from
      'ObjCScopedPointer<CBPeripheralManager>' to 'bool' is ambiguous
    Q_ASSERT(manager);
    ^~~~~~~~~~~~~~~~~
/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtCore.framework/Headers/qglobal.h:780:55: note:
      expanded from macro 'Q_ASSERT'
#    define Q_ASSERT(cond) static_cast<void>(false && (cond))
                                                      ^~~~~~
osx/osxbtutility_p.h:86:5: note: candidate function
    operator T*() const
    ^
/Users/<user>/Code/Qt512/5.12.4/clang_64/lib/QtCore.framework/Headers/qscopedpointer.h:132:5: note:
      candidate function
    operator RestrictedBool() const Q_DECL_NOTHROW
    ^
2 errors generated.
make[3]: *** [.obj/release/osxbtperipheralmanager.o] Error 1
make[2]: *** [release-all] Error 2
make[1]: *** [sub-bluetooth-make_first] Error 2
make: *** [sub-src-make_first] Error 2

[kencu (Ken)]

Each version of clang is increasingly strict with standards, and code needs to be further refined to pass all the error tests with each new clang version. Upstream will no doubt come to fix it.

You might try building it with some older version of clang -- I'm not sure how old will be possible on that OS.

[ra1nb0w]

​https://github.com/qt/qtconnectivity/commit/0fc7e18bf7a24c9408602242d51a852905dfd0da.patch
​https://github.com/qt/qtconnectivity/commit/8110fdd4c6d80d05934768fa808a4cb187212fe0.patch
fix the build.

They are available on qt 5.12.5

[pmetzger (Perry E. Metzger)]

We're now at qt 5.12.5, does that fix this?

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

This problem seems to be fixed by ​the upgrade to 5.12.5.