The following error is produced when trying to compile qtbase using vcpkg, modified to compile Qt in a namespace.

I guess that the problem occurs because QScopedPointer is not wrapped with QT_PREPEND_NAMESPACE, or that everything under #else // !QT_CONFIG(thread)" is not wrapped with QT_BEGIN_NAMESPACE/QT_END_NAMESPACE.

{{/Library/Developer/CommandLineTools/usr/bin/c++ -DCore_EXPORTS -DGL_SILENCE_DEPRECATION -DQT_ASCII_CAST_WARNINGS -DQT_BUILDING_QT -DQT_BUILD_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DEPRECATED_WARNINGS_SINCE=0x060000 -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_MOC_COMPAT -DQT_NAMESPACE=MY_NAMESPACE -DQT_NO_CAST_TO_ASCII -DQT_NO_FOREACH -DQT_NO_USING_NAMESPACE -DQT_USE_QSTRINGBUILDER -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/src/corelib/Core_autogen/include -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/src/corelib -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/src/corelib -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/src/corelib/global -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/src/corelib/kernel -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/src/corelib/../3rdparty/tinycbor/src -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/6.2.1 -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/6.2.1/QtCore -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/src/corelib/.rcc -I/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/mkspecs/macx-clang -isystem /Users/m1/Documents/workspace/vcpkg-build/vcpkg/installed/arm64-osx/include -fPIC -g -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -mmacosx-version-min=10.14 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Wextra -fapplication-extension -std=c++17 -Winvalid-pch -Xarch_arm64 -include/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/src/corelib/CMakeFiles/Core.dir/cmake_pch_arm64.hxx -MD -MT src/corelib/CMakeFiles/Core.dir/global/qrandom.cpp.o -MF src/corelib/CMakeFiles/Core.dir/global/qrandom.cpp.o.d -o src/corelib/CMakeFiles/Core.dir/global/qrandom.cpp.o -c /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/src/corelib/global/qrandom.cpp
In file included from /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/src/corelib/global/qrandom.cpp:49:
In file included from /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/qthreadstorage.h:1:
/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/../../../src/e2b49a9664-31aef8d46e.clean/src/corelib/thread/qthreadstorage.h:162:47: error: no template named 'QScopedPointer'; did you mean 'MY_NAMESPACE::QScopedPointer'?
inline bool qThreadStorage_hasLocalData(const QScopedPointer<T, U> &data)
^~~~~~~~~~~~~~
MY_NAMESPACE::QScopedPointer
/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/../../../src/e2b49a9664-31aef8d46e.clean/src/corelib/tools/qscopedpointer.h:106:7: note: 'MY_NAMESPACE::QScopedPointer' declared here
class QScopedPointer
^
In file included from /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/src/corelib/global/qrandom.cpp:49:
In file included from /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/qthreadstorage.h:1:
/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/../../../src/e2b49a9664-31aef8d46e.clean/src/corelib/thread/qthreadstorage.h:168:47: error: no template named 'QScopedPointer'; did you mean 'MY_NAMESPACE::QScopedPointer'?
inline bool qThreadStorage_hasLocalData(const QScopedPointer<T*, U> &data)
^~~~~~~~~~~~~~
MY_NAMESPACE::QScopedPointer
/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/../../../src/e2b49a9664-31aef8d46e.clean/src/corelib/tools/qscopedpointer.h:106:7: note: 'MY_NAMESPACE::QScopedPointer' declared here
class QScopedPointer
^
In file included from /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/src/e2b49a9664-31aef8d46e.clean/src/corelib/global/qrandom.cpp:49:
In file included from /Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/qthreadstorage.h:1:
/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/../../../src/e2b49a9664-31aef8d46e.clean/src/corelib/thread/qthreadstorage.h:199:5: error: no template named 'QScopedPointer'; did you mean 'MY_NAMESPACE::QScopedPointer'?
QScopedPointer<T, ScopedPointerThreadStorageDeleter> data;
^~~~~~~~~~~~~~
MY_NAMESPACE::QScopedPointer
/Users/m1/Documents/workspace/vcpkg-build/vcpkg/buildtrees/qtbase/arm64-osx-dbg/include/QtCore/../../../src/e2b49a9664-31aef8d46e.clean/src/corelib/tools/qscopedpointer.h:106:7: note: 'MY_NAMESPACE::QScopedPointer' declared here
class QScopedPointer
^
3 errors generated.}}