[QTBUG-99548] Qt6 CMake target compile options propagation (CUDA) - Qt Bug Tracker

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Details

Type: Bug
Status: Closed
Priority: P2: Important
Resolution: Done
Affects Version/s: 6.2.1
Fix Version/s: 6.2.5, 6.3.0 Alpha, 6.4.0 Beta1
Component/s: Build System: CMake
Labels:
None

Platform/s:

Windows
Commits:
ae294a42f0 (qt/qtbase/dev) 9794fc4e54 (qt/qtbase/6.3) c679193fde (qt/qtbase/6.2) c679193fde (qt/tqtc-qtbase/6.2)

Description

File: Qt6Targets.cmake


set_target_properties(Qt6::Platform PROPERTIES
  INTERFACE_COMPILE_DEFINITIONS "WIN32;_ENABLE_EXTENDED_ALIGNED_STORAGE;WIN64;_WIN64;\$<\$<NOT:\$<BOOL:\$<TARGET_PROPERTY:QT_NO_UNICODE_DEFINES>>>:UNICODE;_UNICODE>"
  INTERFACE_COMPILE_FEATURES "cxx_std_17"
  INTERFACE_COMPILE_OPTIONS "-Zc:__cplusplus;-permissive-;\$<\$<NOT:\$<BOOL:\$<TARGET_PROPERTY:QT_NO_UTF8_SOURCE>>>:-utf-8>"
  INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/mkspecs/win32-msvc;${_IMPORT_PREFIX}/include"
  INTERFACE_LINK_LIBRARIES "Threads::Threads"
)

When linking Qt::Core with a library containing CUDA source files, the following flags are incorrectly propagated to nvcc "as-is" thus resulting in nvcc errors such as "unrecognized compile option":

-Zc:__cplusplus
-permissive-
-utf-8

I wonder if we should instead be doing:

INTERFACE_COMPILE_OPTIONS "\$<\$<COMPILE_LANGUAGE:CXX>:-Zc:__cplusplus;-permissive-;\$<\$<NOT:\$<BOOL:\$<TARGET_PROPERTY:QT_NO_UTF8_SOURCE>>>:-utf-8>>"

UPDATE: The above seems to fix the issue.