qtbase: sub-tests suite compile is failing

$ make sub-tests
[..]
make[4]: Entering directory '/home/tkloczko/rpmbuild/BUILD/qtbase-everywhere-src-5.15.2/tests/auto/tools/moc'
g++ -c -pipe -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -flto=auto -flto-partition=none -fdata-sections -ffunction-sections -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_LINKED_LIST -DQT_NO_JAVA_STYLE_ITERATORS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_TESTLIB_LIB -DQT_DBUS_LIB -DQT_CONCURRENT_LIB -DQT_NETWORK_LIB -DQT_SQL_LIB -DQT_CORE_LIB -DQT_TESTCASE_BUILDDIR='"/home/tkloczko/rpmbuild/BUILD/qtbase-everywhere-src-5.15.2/tests/auto/tools/moc"' -I. -Itestproject/include -Itestproject -I../../../../include -I../../../../include/QtTest -I../../../../include/QtDBus -I../../../../include/QtConcurrent -I../../../../include/QtNetwork -I../../../../include/QtSql -I../../../../include/QtCore -I.moc -I../../../../mkspecs/linux-g++ -o .obj/tst_moc.o tst_moc.cpp
In file included from tst_moc.cpp:42:
backslash-newlines.h:56:87: warning: backslash-newline at end of file
 56 | // ends with \\\r should not make moc crash (QTBUG-53441) (no new lines on purpose!!) \
 |
backslash-newlines.h:56:1: warning: multi-line comment [-Wcomment]
 56 | // ends with \\\r should not make moc crash (QTBUG-53441) (no new lines on purpose!!) \
 | ^
In file included from tst_moc.cpp:75:
cxx-attributes.h:42:66: warning: ‘tst_moc::maybe_unused’ scoped attribute directive ignored [-Wattributes]
 42 | [[deprecated]] [[tst_moc::maybe_unused]] int deprecatedSlot2() { return 42; }
 | ^
cxx-attributes.h:48:54: warning: ‘tst_moc::maybe_unused’ scoped attribute directive ignored [-Wattributes]
 48 | void slotWithArguments([[tst_moc::maybe_unused]] int) {}
 | ^~~
cxx-attributes.h:52:57: warning: ‘tst_moc::noreturn’ scoped attribute directive ignored [-Wattributes]
 52 | Q_INVOKABLE [[tst_moc::noreturn]] void noreturnSlot() { throw "unused"; }
 | ^
cxx-attributes.h:53:59: warning: ‘tst_moc::noreturn’ scoped attribute directive ignored [-Wattributes]
 53 | [[tst_moc::noreturn]] Q_SCRIPTABLE void noreturnSlot2() { throw "unused"; }
 | ^
cxx-attributes.h:55:77: warning: ‘tst_moc::noreturn’ scoped attribute directive ignored [-Wattributes]
 55 | Q_SLOT [[tst_moc::noreturn]] [[deprecated]] void noreturnDeprecatedSlot() { throw "unused"; }
 | ^
cxx-attributes.h:56:58: warning: ‘tst_moc::noreturn’ scoped attribute directive ignored [-Wattributes]
 56 | Q_INVOKABLE void noreturnSlot3() [[tst_moc::noreturn]] { throw "unused"; }
 | ^
cxx-attributes.h:98:23: warning: ‘Flag2’ is deprecated [-Wdeprecated-declarations]
 98 | Any = Flag1 | Flag2 | Flag3
 | ^~~~~
cxx-attributes.h:96:9: note: declared here
 96 | Flag2 TEST_COMPILER_DEPRECATION = 2,
 | ^~~~~
cxx-attributes.h:98:31: warning: ‘Flag3’ is deprecated: reason [-Wdeprecated-declarations]
 98 | Any = Flag1 | Flag2 | Flag3
 | ^~~~~
cxx-attributes.h:97:9: note: declared here
 97 | Flag3 TEST_COMPILER_DEPRECATION_X("reason") = 3,
 | ^~~~~
tst_moc.cpp: In member function ‘void StructQObject::foo(ForwardDeclaredStruct*)’:
tst_moc.cpp:324:18: warning: unused variable ‘unusedVariable’ [-Wunused-variable]
 324 | struct Inner unusedVariable;
 | ^~~~~~~~~~~~~~
tst_moc.cpp: At global scope:
tst_moc.cpp:521:5: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
 521 | void const slotWithSillyConst() {}
 | ^~~~
tst_moc.cpp:524:17: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
 524 | Q_INVOKABLE void const slotWithSillyConst2() {}
 | ^~~~
tst_moc.cpp:633:30: error: ISO C++17 does not allow dynamic exception specifications
 633 | void slotWithException() throw(MyStruct);
 | ^~~~~
tst_moc.cpp:785:35: error: ISO C++17 does not allow dynamic exception specifications
 785 | void tst_Moc::slotWithException() throw(MyStruct)
 | ^~~~~
In file included from tst_moc.cpp:1594:
task189996.h:43:14: error: ISO C++17 does not allow dynamic exception specifications
 43 | void d() throw(int) { }
 | ^~~~~
task189996.h:44:20: error: ISO C++17 does not allow dynamic exception specifications
 44 | void e() const throw(int,double) { }
 | ^~~~~
tst_moc.cpp:1779:9: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
 1779 | const int returnConstInt() { return 0; }
 | ^~~~~
In file included from ../../../../include/QtTest/qtestcase.h:1,
 from ../../../../include/QtTest/../../src/testlib/qtest.h:45,
 from ../../../../include/QtTest/qtest.h:1,
 from ../../../../include/QtTest/QtTest:11,
 from tst_moc.cpp:32:
../../../../include/QtTest/../../src/testlib/qtestcase.h: In instantiation of ‘bool QTest::qCompare(const T1&, const T2&, const char*, const char*, const char*, int) [with T1 = QVariant::Type; T2 = QMetaType::Type]’:
tst_moc.cpp:3920:5: required from here
../../../../include/QtTest/../../src/testlib/qtestcase.h:449:34: warning: comparison between ‘const enum QVariant::Type’ and ‘const enum QMetaType::Type’ [-Wenum-compare]
 449 | return compare_helper(t1 == t2, "Compared values are not the same",
 | ~~~^~~~~
../../../../include/QtTest/../../src/testlib/qtestcase.h:449:34: warning: comparison between types ‘const QVariant::Type’ and ‘const QMetaType::Type’ [-Wsign-compare]
In file included from tst_moc.cpp:41:
single_function_keyword.h:50:26: warning: inline function ‘void SingleFunctionKeywordBeforeInline::mySignal()’ used but never defined
 50 | Q_SIGNAL inline void mySignal();
 | ^~~~~~~~
single_function_keyword.h:61:26: warning: inline function ‘void SingleFunctionKeywordAfterInline::mySignal()’ used but never defined
 61 | inline Q_SIGNAL void mySignal();
 | ^~~~~~~~
make[4]: *** [Makefile:12252: .obj/tst_moc.o] Error 1
make[4]: Leaving directory '/home/tkloczko/rpmbuild/BUILD/qtbase-everywhere-src-5.15.2/tests/auto/tools/moc'
make[3]: *** [Makefile:128: sub-moc-make_first] Error 2
make[3]: Leaving directory '/home/tkloczko/rpmbuild/BUILD/qtbase-everywhere-src-5.15.2/tests/auto/tools'
make[2]: *** [Makefile:236: sub-tools-make_first] Error 2
make[2]: Leaving directory '/home/tkloczko/rpmbuild/BUILD/qtbase-everywhere-src-5.15.2/tests/auto'
make[1]: *** [Makefile:48: sub-auto-make_first] Error 2
make[1]: Leaving directory '/home/tkloczko/rpmbuild/BUILD/qtbase-everywhere-src-5.15.2/tests'
make: *** [Makefile:98: sub-tests] Error 2