Failed to build Qt6.8 from source as static library, fails at qtimezonelocale.cpp

jay1

I get the following error while building, try to checking for missing libraries but could not relate or understand the error. Any one faced similar issue ?

Building CXX object qtbase/src/corelib/CMakeFiles/Core.dir/Debug/time/qtimezonelocale.cpp.o
FAILED: qtbase/src/corelib/CMakeFiles/Core.dir/Debug/time/qtimezonelocale.cpp.o 
/home/user/qnx710/host/linux/x86_64/usr/bin/q++ -Vgcc_ntoaarch64le -Wc,-isysroot,/home/user/qnx710/target/qnx7 -lang-c++ -DPCRE2_CODE_UNIT_WIDTH=16 -DQT_ASCII_CAST_WARNINGS -DQT_BUILDING_QT -DQT_BUILD_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_LEAN_HEADERS=1 -DQT_MOC_COMPAT -DQT_NO_CAST_TO_ASCII -DQT_NO_CONTEXTLESS_CONNECT -DQT_NO_FOREACH -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_QASCONST -DQT_NO_QEXCHANGE -DQT_NO_QPAIR -DQT_NO_QSNPRINTF -DQT_NO_USING_NAMESPACE -DQT_TYPESAFE_FLAGS -DQT_USE_NODISCARD_FILE_OPEN -DQT_USE_QSTRINGBUILDER -D_FORTIFY_SOURCE=2 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D_REENTRANT -DCMAKE_INTDIR=\"Debug\" -I/home/user/qt_build/qtbase/src/corelib/Core_autogen/include_Debug -I/home/user/qt_build/qtbase/include -I/home/user/qt_build/qtbase/include/QtCore -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib -I/home/user/qt_build/qtbase/src/corelib -I/home/user/qt_build/qtbase/src/corelib/global -I/home/user/qt_build/qtbase/src/corelib/kernel -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/../3rdparty/tinycbor/src -I/home/user/qt_build/qtbase/include/QtCore/6.8.0 -I/home/user/qt_build/qtbase/include/QtCore/6.8.0/QtCore -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/../3rdparty/double-conversion/double-conversion -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/../3rdparty/double-conversion -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/../3rdparty/forkfd -I/home/user/qt_build/qtbase/src/corelib/.rcc -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/mkspecs/qnx-aarch64le-qcc -I/home/user/qnx710/target/qnx7/usr/include/openssl -I/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/3rdparty/pcre2/src -g -g -std=gnu++17 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Wextra -fexceptions -Wno-invalid-offsetof -fstack-protector-strong -fstack-clash-protection -Winvalid-pch -include /home/user/qt_build/qtbase/src/corelib/CMakeFiles/Core.dir/Debug/cmake_pch.hxx -Wp,-MD,qtbase/src/corelib/CMakeFiles/Core.dir/Debug/time/qtimezonelocale.cpp.o.d -Wp,-MT,qtbase/src/corelib/CMakeFiles/Core.dir/Debug/time/qtimezonelocale.cpp.o -Wp,-MF,qtbase/src/corelib/CMakeFiles/Core.dir/Debug/time/qtimezonelocale.cpp.o.d -o qtbase/src/corelib/CMakeFiles/Core.dir/Debug/time/qtimezonelocale.cpp.o -c /home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/time/qtimezonelocale.cpp
In file included from /home/user/qt_build/qtbase/include/QtCore/qassert.h:1,
                 from /home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/global/qglobal.h:35,
                 from /home/user/qt_build/qtbase/include/QtCore/qglobal.h:1,
                 from /home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/global/qt_pch.h:20,
                 from /home/user/qt_build/qtbase/src/corelib/CMakeFiles/Core.dir/Debug/cmake_pch.hxx:5,
                 from <command-line>:
/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/time/qtimezonelocale.cpp: In function 'constexpr UCalendarDisplayNameType {anonymous}::ucalDisplayNameType(QTimeZone::TimeType, QTimeZone::NameType)':
/home/user/qt_src/qt-everywhere-src-6.8.0/qtbase/src/corelib/time/qtimezonelocale.cpp:34:5: error: call to non-'constexpr' function 'void qt_assert_x(const char*, const char*, const char*, int)'
     Q_UNREACHABLE_RETURN(UCAL_STANDARD);
     ^~~~~~~~~~~~~~~~~~~~
[19/15360] Building CXX object qtdeclarative/src/quicktemplates/CMakeFiles/QuickTemplates2.dir/Release/cmake_pch.hxx.gch
ninja: build stopped: subcommand failed.

Christian Ehrlicher

Looks like some problems with the qnx compiler/standard library that a function is not constexpr but Qt expects it.

jay1

@Christian-Ehrlicher Does it mean that compiler is incorrectly evaluating the constexpr.
As qtimezonelocale.cpp is part of the Qt source code.

Christian Ehrlicher

@jay1 said in Failed to build Qt6.8 from source as static library, fails at qtimezonelocale.cpp:

Does it mean that compiler is incorrectly evaluating the constexpr.

No, the compiler does not think that the function is constexpr due to some compiler bugs I would say. You should create a bug report to see if this is can be fixed or the qnx compiler is (once more) simply too bugged.
You should make sure to use the latest qnx compiler.

jay1

Disabling the precompile headers by using the option "-no-pch" resolved this issue.