c++ - 未知的 CMake 命令 "check_language"

Question

我有一个包含“普通”代码和 CUDA 代码的项目。整个项目由cmake管理。现在，根据目标计算机上 CUDA 的可用性，我希望能够打开和关闭 CUDA 文件。为此，我打算使用 CMake 命令“check_language”，并在以下 CMakeLists 文件中实现它:

cmake_minimum_required(VERSION 3.17)

set(PROJECT_NAME "Hello_World_with_CUDA")
set(PROJECT_VERSION 1.0.0)

project(${PROJECT_NAME} VERSION ${PROJECT_VERSION} DESCRIPTION "UPPE pulse propagation library" LANGUAGES CXX)

include(GNUInstallDirs)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
set(EXECUTABLE_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/bin)
set(LIBRARY_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/lib)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

check_language(CUDA)
if(CMAKE_CUDA_COMPILER)
    enable_language(CUDA)
    set(CMAKE_CUDA_STANDARD 14)
    set(CMAKE_CUDA_STANDARD_REQUIRED ON)
    add_compile_definitions(USE_CUDA)
else(CMAKE_CUDA_COMPILER)
    message(STATUS "No CUDA support")
    remove_definitions(USE_CUDA)
endif(CMAKE_CUDA_COMPILER)

cmake_policy (SET CMP0074 NEW)

set(PROJECT_SRC source/main.cpp source/test.cu)
set(PROJECT_INC include/test.hpp)

set(PROJECT_SRC ${PROJECT_SRC}
        ${PROJECT_INC})

add_executable(${PROJECT_NAME}
                ${PROJECT_SRC})

target_include_directories(${PROJECT_NAME} PRIVATE
        include)

尽管如此，我还是收到了错误

CMake Error at CMakeLists.txt:17 (check_language):
  Unknown CMake command "check_language".

即使我在 3.17.2 版本中有 cmake。为什么会这样？我怎样才能继续使用这张支票？或者我必须诉诸不同的解决方案？

当然，如果我切换出该 block

check_language(CUDA)

if(CMAKE_CUDA_COMPILER)
    enable_language(CUDA)
    set(CMAKE_CUDA_STANDARD 14)
    set(CMAKE_CUDA_STANDARD_REQUIRED ON)
    add_compile_definitions(USE_CUDA)
else(CMAKE_CUDA_COMPILER)
    message(STATUS "No CUDA support")
    remove_definitions(USE_CUDA)
endif(CMAKE_CUDA_COMPILER)

与

find_package(CUDA QUIET)
if(CUDA_FOUND)
    enable_language(CUDA)
    set(CMAKE_CUDA_STANDARD 14)
    set(CMAKE_CUDA_STANDARD_REQUIRED ON)
    add_compile_definitions(USE_CUDA)
else(CUDA_FOUND)
    message(STATUS "No CUDA support")
    remove_definitions(USE_CUDA)
endif(CUDA_FOUND)

它有效，但我打算使用建议的方法，而不是已弃用的版本。

Answer 1

添加CheckLanguage模块添加到 CMakeLists.txt 文件中，以将 enable_language 与 include(CheckLanguage) 结合使用。

As Tsyvarev posted here