开罗库和Cmake

Question

开罗库和Cmake

3

我刚接触C++和CMake。我通过端口安装了cairo库，方法在这里here。现在我想将cairo包含到我的项目中。我按照这里here所示的CMakeLists.txt命令编写了代码。

cmake_minimum_required(VERSION 3.6)
project(HelloOpenGL)

set(CMAKE_CXX_STANDARD 11)

set(SOURCE_FILES main.cpp)
add_executable(HelloOpenGL ${SOURCE_FILES})

#find_package(ImageMagick COMPONENTS Magick++)
#include_directories(${ImageMagick_INCLUDE_DIRS})
#target_link_libraries(HelloOpenGL ${ImageMagick_LIBRARIES})

find_package(Cairo)
include_directories(${Cairo_INCLUDE_DIRS})
target_link_libraries(HelloOpenGL ${Cairo_LIBRARIES})

if(CAIRO_FOUND)
    message("Cairo found")
    else()
    message("Cairo not found")
    endif()

但它不起作用，我得到了这个输出 -

CMake Warning at CMakeLists.txt:16 (find_package):
  By not providing "FindCairo.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Cairo", but
  CMake did not find one.

  Could not find a package configuration file provided by "Cairo" with any of
  the following names:

    CairoConfig.cmake
    cairo-config.cmake

  Add the installation prefix of "Cairo" to CMAKE_PREFIX_PATH or set
  "Cairo_DIR" to a directory containing one of the above files.  If "Cairo"
  provides a separate development package or SDK, be sure it has been
  installed.

请帮我正确地包含cairo

- Mansur Nashaev

你使用的是哪个版本的CMake？ - fedepad

1个回答

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- fedepad · Accepted Answer

问题在于您的CMake版本没有（顺便说一下，即使是最新的CMake开发版本也没有... https://gitlab.kitware.com/cmake/cmake/tree/master/Modules）您需要运行命令find_package(Cairo) 的FindCairo.cmake文件，并且您没有将此文件包含在您的软件包中。
解决方法是从Web上获取一个FindCairo.cmake文件，在项目根目录下创建一个cmake目录，并在CMakeLists.txt中添加额外的行。

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

所以你从 CMakeLists.txt 中提取的代码片段应该如下所示：

cmake_minimum_required(VERSION 3.6)
project(HelloOpenGL)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
set(CMAKE_CXX_STANDARD 11)

set(SOURCE_FILES main.cpp)
add_executable(HelloOpenGL ${SOURCE_FILES})

#find_package(ImageMagick COMPONENTS Magick++)
#include_directories(${ImageMagick_INCLUDE_DIRS})
#target_link_libraries(HelloOpenGL ${ImageMagick_LIBRARIES})

find_package(Cairo)
include_directories(${Cairo_INCLUDE_DIRS})
target_link_libraries(HelloOpenGL ${Cairo_LIBRARIES})

如果您不使用已经存在的FindCairo.cmake（例如您安装的Cairo可能包含这样一个文件），则必须编写一个或找到另一种替代方法来包含该软件包。