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Details

Type: Bug
Resolution: Fixed
Priority: P3: Somewhat important
Fix Version/s: 6.5.5, 6.6.2, 6.7.0 Beta2, 6.8.0 FF
Affects Version/s: 6.3, 6.4, 6.5, 6.6, 6.7, 6.8
Component/s: Build System
Labels:
None

Platform/s:

Windows
Commits:
b4246a5c2 (dev), 8e424eba7 (6.7), 4f57f76a9 (6.6), c9b8dcae2 (tqtc/lts-6.5)

Description

Original issue in conan: https://github.com/conan-io/conan-center-index/issues/21652

This is a blocking issue to use qt from conan and globally in an environment where you cannot change yourself the source directory and the build directory to shorten the paths.

How to reproduce locally without conan:

mkdir C:\.c\p\qt8f084c48e3426\s\
cd C:\.c\p\qt8f084c48e3426\s\
git clone https://code.qt.io/qt/qt5.git src
cd src
perl.exe init-repository --module-subset=qtbase,qtrepotools,qtdeclarative,qtshadertools
mkdir C:/.c/p/b/qta7d2dc6fbf9eb/b/build/Debug/
cd C:/.c/p/b/qta7d2dc6fbf9eb/b/build/Debug/
C:\.c\p\qt8f084c48e3426\s\src\configure.bat -gui -widgets
cmake --build . --parallel

Then you get the following error;

[5146/5393] Building CXX object qtdeclarative\src\quickdialogs\quickdialogsquickimpl\CMakeFiles\QuickDialogs2QuickImpl.dir\quickdialogs2quickimpl_qmltyperegistrations.cpp.obj
FAILED: qtdeclarative/src/quickdialogs/quickdialogsquickimpl/CMakeFiles/QuickDialogs2QuickImpl.dir/quickdialogs2quickimpl_qmltyperegistrations.cpp.obj
C:\PROGRA~2\MICROS~2\2019\PROFES~1\VC\Tools\MSVC\1429~1.301\bin\Hostx64\x64\cl.exe  /nologo /TP -DNOMINMAX -DQT_ASCII_CAST_WARNINGS -DQT_BUILDING_QT -DQT_BUILD_QUICKDIALOGS2QUICKIMPL_LIB -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x040800 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_GUI_LIB -DQT_LEAN_HEADERS=1 -DQT_MOC_COMPAT -DQT_NETWORK_LIB -DQT_NO_AS_CONST -DQT_NO_AS_CONST=1 -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_EXCEPTIONS -DQT_NO_FOREACH -DQT_NO_FOREACH=1 -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_QEXCHANGE -DQT_OPENGL_LIB -DQT_QMLBUILTINS_LIB -DQT_QMLINTEGRATION_LIB -DQT_QMLMODELS_LIB -DQT_QML_LIB -DQT_QUICKCONTROLS2IMPL_LIB -DQT_QUICKDIALOGS2UTILS_LIB -DQT_QUICKTEMPLATES2_LIB -DQT_QUICK_LIB -DQT_USE_QSTRINGBUILDER -DQT_WARN_DEPRECATED_UP_TO=0x070000 -DQuickDialogs2QuickImpl_EXPORTS -DUNICODE -DWIN32 -DWIN64 -D_CRT_SECURE_NO_WARNINGS -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_USE_MATH_DEFINES -D_WIN64 -D_WINDLL -Iqtdeclarative\src\quickdialogs\quickdialogsquickimpl\QuickDialogs2QuickImpl_autogen\include -Iqtbase\include -Iqtbase\include\QtQuickDialogs2QuickImpl -IC:\.c\p\qt8f084c48e3426\s\src\qtdeclarative\src\quickdialogs\quickdialogsquickimpl -Iqtdeclarative\src\quickdialogs\quickdialogsquickimpl -Iqtbase\include\QtQuickDialogs2QuickImpl\6.8.0 -Iqtbase\include\QtQuickDialogs2QuickImpl\6.8.0\QtQuickDialogs2QuickImpl -Iqtdeclarative\src\qml -Iqtbase\include\QtQml\6.8.0 -Iqtbase\include\QtQml\6.8.0\QtQml -Iqtbase\src\corelib -Iqtbase\include\QtCore\6.8.0 -Iqtbase\include\QtCore\6.8.0\QtCore -Iqtbase\include\QtCore -IC:\.c\p\qt8f084c48e3426\s\src\qtbase\mkspecs\win32-msvc -Iqtbase\include\QtQmlBuiltins\6.8.0 -Iqtbase\include\QtQmlBuiltins\6.8.0\QtQmlBuiltins -Iqtbase\include\QtQmlBuiltins -Iqtbase\include\QtQml -Iqtbase\include\QtQmlIntegration -IC:\.c\p\qt8f084c48e3426\s\src\qtdeclarative\src\qmlintegration -Iqtdeclarative\src\qmlintegration -Iqtbase\include\QtNetwork -Iqtbase\include\QtGui -Iqtbase\include\QtQuick -Iqtbase\include\QtQmlModels -Iqtbase\include\QtOpenGL -Iqtbase\src\gui -Iqtbase\include\QtGui\6.8.0 -Iqtbase\include\QtGui\6.8.0\QtGui -Iqtdeclarative\src\quick -Iqtbase\include\QtQuick\6.8.0 -Iqtbase\include\QtQuick\6.8.0\QtQuick -Iqtdeclarative\src\qmlmodels -Iqtbase\include\QtQmlModels\6.8.0 -Iqtbase\include\QtQmlModels\6.8.0\QtQmlModels -Iqtbase\include\QtQuickTemplates2 -Iqtdeclarative\src\quicktemplates -Iqtbase\include\QtQuickTemplates2\6.8.0 -Iqtbase\include\QtQuickTemplates2\6.8.0\QtQuickTemplates2 -Iqtdeclarative\src\quickcontrolsimpl -Iqtbase\include\QtQuickControls2Impl\6.8.0 -Iqtbase\include\QtQuickControls2Impl\6.8.0\QtQuickControls2Impl -Iqtbase\include\QtQuickControls2Impl -Iqtbase\include\QtQuickDialogs2Utils -Iqtdeclarative\src\quickdialogs\quickdialogsutils -Iqtbase\include\QtQuickDialogs2Utils\6.8.0 -Iqtbase\include\QtQuickDialogs2Utils\6.8.0\QtQuickDialogs2Utils /DWIN32 /D_WINDOWS /DNDEBUG  -O2 -Ob3 -O2 -Ob3 -MD /W3 /EHs-c- /wd4530 /wd4577 -Zc:__cplusplus -permissive- -utf-8 -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zc:ternary -Zc:externConstexpr -Zc:wchar_t -bigobj -guard:cf -Gw -std:c++17 /bigobj /YuC:/.c/p/b/qta7d2dc6fbf9eb/b/build/Debug/qtdeclarative/src/quickdialogs/quickdialogsquickimpl/CMakeFiles/QuickDialogs2QuickImpl.dir/cmake_pch.hxx /FpC:/.c/p/b/qta7d2dc6fbf9eb/b/build/Debug/qtdeclarative/src/quickdialogs/quickdialogsquickimpl/CMakeFiles/QuickDialogs2QuickImpl.dir/./cmake_pch.cxx.pch /FIC:/.c/p/b/qta7d2dc6fbf9eb/b/build/Debug/qtdeclarative/src/quickdialogs/quickdialogsquickimpl/CMakeFiles/QuickDialogs2QuickImpl.dir/cmake_pch.hxx /showIncludes /Foqtdeclarative\src\quickdialogs\quickdialogsquickimpl\CMakeFiles\QuickDialogs2QuickImpl.dir\quickdialogs2quickimpl_qmltyperegistrations.cpp.obj /Fdqtdeclarative\src\quickdialogs\quickdialogsquickimpl\CMakeFiles\QuickDialogs2QuickImpl.dir\ /FS -c qtdeclarative\src\quickdialogs\quickdialogsquickimpl\quickdialogs2quickimpl_qmltyperegistrations.cpp
qtbase\include\QtQuickDialogs2QuickImpl\6.8.0\QtQuickDialogs2QuickImpl\private/qquicksaturationlightnesspicker_p.h(1): fatal error C1083: Cannot open include file: '../../../../../../../../../../../qt8f084c48e3426/s/src/qtdeclarative/src/quickdialogs/quickdialogsquickimpl/qquicksaturationlightnesspicker_p.h': No such file or directory

Investigation

There is an issue in msvc, the include path longer than 260 characters are not supported: https://developercommunity.visualstudio.com/t/clexe-compiler-driver-cannot-handle-long-file-path/975889
syncqt tool in the qt build system generates relative path from the build folder to the source folder
In conan the build and the source folder are far away (even if conan home is reduced to a minimum like C:\.c

=> we end up having a build path + relative path to source > 260 chars when qtdeclarative + qtsharedtool are activated

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For Gerrit Dashboard: QTBUG-120758
#	Subject	Branch	Project	Status	CR	V
529795,3	syncqt: always use absolute path in the generated headers	dev	qt/qtbase	Status: MERGED	+2	0
530073,2	syncqt: always use absolute path in the generated headers	6.7	qt/qtbase	Status: MERGED	+2	0
530543,2	syncqt: always use absolute path in the generated headers	6.6	qt/qtbase	Status: MERGED	+2	0
530646,2	syncqt: always use absolute path in the generated headers	tqtc/lts-6.5	qt/tqtc-qtbase	Status: MERGED	+2	0