QT 6.7.2 failed to build with QT_NO_EXCEPTIONS for Android with the following errors:
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/io/qprocess_unix.cpp:889:29: error: use of undeclared identifier 'e'
failChildProcess(d, e.what(), FakeErrnoForThrow);
^
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/io/qprocess_unix.cpp:890:7: error: expected expression
} QT_CATCH (...) {
^
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/global/qexceptionhandling.h:28:23: note: expanded from macro 'QT_CATCH'
# define QT_CATCH(A) else
^
2 errors generated.
[673/5992] Building CXX object qtbase/src/corelib/CMakeFiles/Core.dir/itemmodels/qabstractitemmodel.cpp.o
ninja: build stopped: subcommand failed.
qt-everywhere-src-6.7.2\qtbase\src\corelib\io\qprocess_unix.cpp:
// the noexcept here adds an extra layer of protection
static void callChildProcessModifier(const QProcessPrivate *d) noexcept
{
QT_TRY {
if (d->unixExtras->childProcessModifier)
d->unixExtras->childProcessModifier();
} QT_CATCH (std::exception &e) {
failChildProcess(d, e.what(), FakeErrnoForThrow);
} QT_CATCH (...) {
failChildProcess(d, "throw", FakeErrnoForThrow);
}
}
The definitions of QT_TRY and QT_CATCH:
#ifdef QT_NO_EXCEPTIONS
# define QT_TRY if (true)
# define QT_CATCH(A) else
# define QT_THROW(A) qt_noop()
# define QT_RETHROW qt_noop()
# define QT_TERMINATE_ON_EXCEPTION(expr) do { expr; } while (false)
#else
# define QT_TRY try
# define QT_CATCH(A) catch (A)
# define QT_THROW(A) throw A
# define QT_RETHROW throw
# ifdef Q_COMPILER_NOEXCEPT
# define QT_TERMINATE_ON_EXCEPTION(expr) do { expr; } while (false)
# else
# define QT_TERMINATE_ON_EXCEPTION(expr) do { try { expr; } catch (...) { qTerminate(); } } while (false)
# endif
#endif
Workaround
I tried to simply replace line 889 with
failChildProcess(d, "e.what() workaround", FakeErrnoForThrow);
but got:
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/io/qprocess_unix.cpp:890:7: error: expected expression
} QT_CATCH (...) {
^
C:/dev/repos/qt-everywhere-src-6.7.2/qtbase/src/corelib/global/qexceptionhandling.h:28:23: note: expanded from macro 'QT_CATCH'
# define QT_CATCH(A) else
^
1 error generated.
[639/5992] Building CXX object qtbase/src/corelib/CMakeFiles/Core.dir/io/qsettings.cpp.o
ninja: build stopped: subcommand failed.
so I commented out all the try/catch block:
// the noexcept here adds an extra layer of protection
static void callChildProcessModifier(const QProcessPrivate *d) noexcept
{
//QT_TRY {
if (d->unixExtras->childProcessModifier)
d->unixExtras->childProcessModifier();
// } QT_CATCH (std::exception &e) {
// failChildProcess(d, "e.what() workaround", FakeErrnoForThrow);
// } QT_CATCH (...) {
// failChildProcess(d, "throw", FakeErrnoForThrow);
// }
}
error: cannot pass object of non-trivial type ‘QtJniTypes::Context’ through variadic constructor
https://forum.qt.io/topic/157520/error-cannot-pass-object-of-non-trivial-type-qtjnitypes-context-through-variadic-constructor
https://bugreports.qt.io/browse/QTBUG-126792
Not a bug because this is not supported. Feel free to supply patches.