6.2.1, msvc static, missing /permissive- compiler option

okhyzha

Hello,
I'm trying to build Qt 6.2.1 static on Win10 using MS VC 19.26.28806 (VS 2019 16.6.2). Here is my configuration:

mkdir build
cd build
..\configure.bat -debug-and-release -opensource -developer-build -static -static-runtime ^
-c++std c++17 ^
-nomake tests -nomake examples -nomake tools ^
-opengl dynamic -direct2d -qt-libpng -qt-libjpeg ^
-skip qtwebchannel ^
-skip qtwebengine ^
-skip qtwebview ^
-skip qtwebplugin ^
-skip qtwebsockets ^
-skip qtwebview ^
-skip qttools ^
-skip qtdoc ^
-skip qttranslations ^
-- -D QT_BUILD_TESTS_BY_DEFAULT=OFF -D QT_NO_BUILD_TESTS=ON -D QT_BUILD_STANDALONE_TESTS=OFF

configuration went relatively good, then I start to build:

cmake --build . --parallel

and immediately get the following errors in several places:

D:\dev\qt6\build\qtbase\include\QtCore\../../../../qtbase/src/corelib/global/qglobal.h(105): error C2338: On MSVC you must pass the /permissive- option to the compiler.

I do not really see, where should I pass that option and why it was not set automatically?

Thanks.

Christian Ehrlicher

This flag is set in qt_set_msvc_cplusplus_options() inside QtFlagHandlingHelpers.cmake - maybe add a debug message in there to make sure it's really added or not. Are you sure you set up your environment - maybe there is an older cl.exe in your path...

okhyzha

Are you sure you set up your environment - maybe there is an older cl.exe in your path...

I've checked several times, that's the current output:

-- CMAKE_VERSION: "3.22.0-rc1"
-- CMAKE_HOST_SYSTEM: "Windows-10.0.19043"
-- CMAKE_HOST_SYSTEM_NAME: "Windows"
-- CMAKE_HOST_SYSTEM_VERSION: "10.0.19043"
-- CMAKE_HOST_SYSTEM_PROCESSOR: "AMD64"
-- CMAKE_SYSTEM: "Windows"
-- CMAKE_SYSTEM_NAME: "Windows"
-- CMAKE_SYSTEM_VERSION: "10.0.19043"
-- CMAKE_SYSTEM_PROCESSOR: "AMD64"
-- CMAKE_CROSSCOMPILING: "FALSE"
-- CMAKE_C_COMPILER: "D:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.26.28801/bin/Hostx64/x64/cl.exe" (19.26.28806.0)
-- CMAKE_CXX_COMPILER: "D:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.26.28801/bin/Hostx64/x64/cl.exe" (19.26.28806.0)
-- MSVC_VERSION: "1926"
-- MSVC_TOOLSET_VERSION: "142"

I've set the following just to check

    if(MSVC AND MSVC_VERSION GREATER_EQUAL 1913)
    	message(FATAL_ERROR "We are here")
        target_compile_options("${target}" ${visibility} "-Zc:__cplusplus" "-permissive-")
    endif()

it happens, so the function is called. After I've made a clean configuration (removed everything in the build folder), configuraton went good but then again:

D:\dev\qt6\build\qtbase\include\QtCore\../../../../qtbase/src/corelib/global/qglobal.h(105): error C2338: On MSVC you must pass the /permissive- option to the compiler.

and what's interesting, the option is there

"D:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\Hostx64\x64\cl.exe"  /nologo /TP -DHAVE_CONFIG_H -DPCRE2_CODE_UNIT_WIDTH=16 -DPCRE2_DISABLE_JIT -DPCRE2_STATIC -DQT_BOOTSTRAPPED -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_FOREACH -DQT_TYPESAFE_FLAGS -DQT_USE_QSTRINGBUILDER -DQT_VERSION_MAJOR=6 -DQT_VERSION_MINOR=3 -DQT_VERSION_PATCH=0 -DQT_VERSION_STR=\"6.3.0\" -DUNICODE -DWIN32 -DWIN64 -D_CRT_SECURE_NO_WARNINGS -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -DCMAKE_INTDIR=\"Release\" -ID:\dev\qt6\build\qtbase\src\corelib\Core_autogen\include_Release -ID:\dev\qt6\build\qtbase\include -ID:\dev\qt6\build\qtbase\include\QtCore -ID:\dev\qt6\qtbase\src\corelib -ID:\dev\qt6\build\qtbase\src\corelib -ID:\dev\qt6\build\qtbase\src\corelib\global -ID:\dev\qt6\build\qtbase\src\corelib\kernel -ID:\dev\qt6\qtbase\src\corelib\..\3rdparty\tinycbor\src -ID:\dev\qt6\build\qtbase\include\QtCore\6.3.0 -ID:\dev\qt6\build\qtbase\include\QtCore\6.3.0\QtCore -ID:\dev\qt6\qtbase\src\corelib\..\3rdparty\zlib\src -ID:\dev\qt6\qtbase\src\corelib\..\3rdparty\double-conversion\double-conversion -ID:\dev\qt6\qtbase\src\corelib\..\3rdparty\double-conversion -ID:\dev\qt6\build\qtbase\src\corelib\.rcc -ID:\dev\qt6\build\qtbase\mkspecs\win32-msvc -ID:\\dev\\OpenSSL\\include -ID:\dev\qt6\qtbase\src\3rdparty\pcre2\src -ID:\dev\qt6\build\qtbase\src\xml\Xml_autogen\include_Release -ID:\dev\qt6\build\qtbase\include\QtXml -ID:\dev\qt6\qtbase\src\xml -ID:\dev\qt6\build\qtbase\src\xml -ID:\dev\qt6\build\qtbase\include\QtXml\6.3.0 -ID:\dev\qt6\build\qtbase\include\QtXml\6.3.0\QtXml -ID:\dev\qt6\qtbase\src\tools\bootstrap\.. -ID:\dev\qt6\qtbase\src\tools\bootstrap\..\..\3rdparty\tinycbor\src -ID:\dev\qt6\qtbase\src\tools\bootstrap\..\..\3rdparty\pcre2\src -ID:\dev\qt6\qtbase\src\tools\bootstrap\..\..\3rdparty\zlib\src /DWIN32 /D_WINDOWS /DNDEBUG -O2 -MT /W3 **-permissive-** -Zc:__cplusplus -utf-8 -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zc:externConstexpr -Zc:wchar_t -guard:cf -std:c++17 /showIncludes /Foqtbase\src\tools\bootstrap\CMakeFiles\Bootstrap.dir\Release\__\__\corelib\global\qglobal.cpp.obj /Fdqtbase\src\tools\bootstrap\Release\Qt6Bootstrap.pdb /FS -c D:\dev\qt6\qtbase\src\corelib\global\qglobal.cpp

but still the error is there

okhyzha

So, I've kind of solved that, I've updated to the latest VS, installed last available WinSDK (there were build errors with old ones), just comment out the check in the qglobal.h

//static_assert(!std::is_convertible_v<std::nullptr_t, bool>,
//              "On MSVC you must pass the /permissive- option to the compiler.");

After all I needed to disable building of qttools, there were other errors. That's not the perfect solution but at least I built it. And still I want to know why it does not build as explained in the documentation and having now LTS release 6.2.

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6.2.1, msvc static, missing /permissive- compiler option