qstring.h:1125:40: error: '= delete' with a message is a C++2c extension

Error

Run into many compilation errors when building Android developer build on dev for all the module

In file included from /home/ramipotinkara/dev/envs/qt610_16052025/qt6/qt6-android-bld-x86_64/qtbase/include/QtCore/qstring.h:1:
/home/ramipotinkara/dev/envs/qt610_16052025/qt6/qtbase/src/corelib/text/qstring.h:1125:40: error: '= delete' with a message is a C++2c extension [-Werror,-Wc++26-extensions]
 1125 |     QString &operator+=(const char *s) QSTRING_DECL_DELETED_ASCII_OP;
      |                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ramipotinkara/dev/envs/qt610_16052025/qt6/qtbase/src/corelib/text/qstring.h:1124:58: note: expanded from macro 'QSTRING_DECL_DELETED_ASCII_OP'
 1124 | #define QSTRING_DECL_DELETED_ASCII_OP Q_DECL_EQ_DELETE_X("This function is not available under QT_NO_CAST_FROM_ASCII")
      |                                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ramipotinkara/dev/envs/qt610_16052025/qt6/qtbase/src/corelib/global/qcompilerdetection.h:1039:49: note: expanded from macro 'Q_DECL_EQ_DELETE_X'
 1039 | #    define Q_DECL_EQ_DELETE_X(reason) = delete(reason)
      |                                                 ^~~~~~

Used env

• Qt dev got on 16th of May 2025
• Target architecture: x86_64
• Host: Linux Ubuntu 24.04
• NDK: NDK29 Beta-1 from QTBUG-132640 

Plausible reason

• Calling C++26 specific macros on Qt build that does not support them

Fix proposal

• Put C+26 specific part behind C+ 26 compilation flag