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# Copyright (C) 2026 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause
cmake_minimum_required(VERSION 3.16...3.28)
project(test_cxx_modules)
# C++ module support requires CMake 3.28+ and Ninja 1.11+; skip silently otherwise.
if(CMAKE_VERSION VERSION_LESS "3.28")
return()
endif()
execute_process(
COMMAND "${CMAKE_MAKE_PROGRAM}" --version
OUTPUT_VARIABLE _ninja_version
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_QUIET
)
if(_ninja_version VERSION_LESS "1.11")
return()
endif()
# Skip silently on toolchains too old to reliably support C++20 modules.
if((CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "14")
OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "16"))
return()
endif()
set(optional_modules Concurrent DBus Gui Network OpenGL OpenGLWidgets PrintSupport Sql Test Widgets Xml)
find_package(Qt6 REQUIRED COMPONENTS Core)
find_package(Qt6 OPTIONAL_COMPONENTS ${optional_modules})
add_executable(test_cxx_modules main.cpp)
target_sources(test_cxx_modules
PRIVATE FILE_SET CXX_MODULES FILES mod.cppm
)
set_target_properties(test_cxx_modules PROPERTIES
CXX_STANDARD 20
CXX_STANDARD_REQUIRED ON
)
target_link_libraries(test_cxx_modules PRIVATE Qt::Core)
foreach(_mod IN LISTS optional_modules)
if(TARGET Qt::${_mod})
string(TOUPPER "${_mod}" _MOD)
target_compile_definitions(test_cxx_modules PRIVATE HAS_QT${_MOD})
target_link_libraries(test_cxx_modules PRIVATE Qt::${_mod})
endif()
endforeach()