开罗图书馆和Cmake [英] Cairo library and Cmake

问题描述

我是c ++和cmake的新手。我通过端口此处安装了cairo库。现在我想将开罗纳入我的项目。我写了CmakeLists.txt命令，如此处所示。

I'm new to c++ and cmake. I installed cairo library as written here via port. Now i want to include cairo to my project. I wrote the CmakeLists.txt commands as shown here.

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()

但是它不起作用，我得到了这个输出-

But it's not working, I get this output -

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.

请帮助我正确包含开罗，

Help me to properly include cairo, please

推荐答案

问题是您的CMake版本不具备（顺便说一句，即使是最新的CMake开发版本也没有它…… https://gitlab.kitware.com/cmake/cmake/tree/master/Modules ）
文件 FindCairo.cmake ，您需要运行命令 find_package（Cairo），而您尚未

一种解决方案是从网上获取 FindCairo.cmake 文件，创建一个 cmake 目录位于项目的根目录中，并在 CMakeLists.txt 中有多余的行

The problem is that your version of CMake doesn't have (by the way, not even the latest development version of CMake has it ... https://gitlab.kitware.com/cmake/cmake/tree/master/Modules) the file FindCairo.cmake that you need to have to run the command find_package(Cairo) and you haven't included this file in your package.
A solution is to grab a FindCairo.cmake file from the web, create a cmake directory inside the root directory of your project and have in CMakeLists.txt the extra line

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

，所以您来自 CMakeLists.txt 的代码段看起来像：

so your snippet from CMakeLists.txt would look like:

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})

如果不要使用已经存在的 FindCairo.cmake （例如您安装的Cairo可能包含一个这样的文件），您将不得不编写一个文件或找到其他方法来包含该软件包。

If you will not use an already existing FindCairo.cmake (e.g. Cairo that you installed might contain one such file) you will have to write one or find an alternative way to include the package.

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