带有相对路径的CMake安装目标

Ali 发表于 Dev

但

我试图弄清楚如何编写一个可以通过调用find_package()另一个项目来使用的库。我正在尝试遵循Catch2存储库CMake文件。

这是我提出的一个最低版本：（git repo在这里可用）

cmake_minimum_required(VERSION 3.14.4)

set(project_name "hello")
project(${project_name} LANGUAGES CXX)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")

include(GNUInstallDirs)
include(CMakePackageConfigHelpers)

add_library(${project_name} STATIC)

target_sources(${project_name} PRIVATE "src/hello.cpp")

target_include_directories(${project_name}
    PUBLIC
        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/src/>
        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)

install(
    DIRECTORY ${CMAKE_CURRENT_LIST_DIR}/src/
    DESTINATION include
    FILES_MATCHING REGEX "src/.+\.h"
    PERMISSIONS
        OWNER_READ
        GROUP_READ
        WORLD_READ)

set(PROJECT_CMAKE_CONFIG_DESTINATION ${CMAKE_INSTALL_LIBDIR}/../)
configure_package_config_file(
    ${CMAKE_CURRENT_LIST_DIR}/cmake/${project_name}Config.cmake.in
    ${CMAKE_CURRENT_BINARY_DIR}/${project_name}Config.cmake
    INSTALL_DESTINATION
        ${PROJECT_CMAKE_CONFIG_DESTINATION})

install(
    TARGETS
        ${project_name}
    EXPORT
        ${project_name}Targets
    RUNTIME DESTINATION bin
    LIBRARY DESTINATION lib
    ARCHIVE DESTINATION lib)

install(
    EXPORT
        ${project_name}Targets
    NAMESPACE
        ${project_name}::
    DESTINATION
        ${PROJECT_CMAKE_CONFIG_DESTINATION})

install(
    FILES
        "${CMAKE_CURRENT_BINARY_DIR}/${project_name}Config.cmake"
    DESTINATION
        ${PROJECT_CMAKE_CONFIG_DESTINATION})

然后我安装正在使用：

- cmake -DCMAKE_INSTALL_PREFIX:PATH="C:\tmp\install"
- cmake --build . --install target

一切似乎都被复制到正确的路径。但是，当我尝试find_package()从消耗我的测试库的另一个项目中使用时，出现以下错误：

CMake Error at C:/tmp/install/helloTargets.cmake:76 (message):
  The imported target "hello::hello" references the file

     "C://lib/hello.lib"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     "C:/tmp/install/helloTargets.cmake"

  but not all the files it references.

Call Stack (most recent call first):
  C:/tmp/install/helloConfig.cmake:33 (include)
  CMakeLists.txt:15 (find_package)

似乎缺少cmake安装目录的路径。如何修改安装功能，以便可以使用生成的配置文件find_package()？

碱

在您的CMakeLists.txt中，现阶段有些奇怪的事情：

target_include_directories(${project_name}
    PUBLIC
        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/src/> 
        # there is no header in this folder so this has no effect
        # maybe create a include/ folder to make it more "legit"
        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)

您应该在target_sources中沿着.cpp指定头文件。这有2种效果：
- 当您执行install（TARGETS hello）时，可以添加PUBLIC_HEADER关键字将属于目标的每个标头安装到$ {CMAKE_INSTALL_INCLUDEDIR}。这样，您无需使用正则表达式进行安装（目录）
- IDE将向他们显示
在helloConfig.cmake.in中