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c++ - cmake 找不到“OPENCV”提供的包配置文件

问题描述

我已经从源代码构建了 OpenCV v4.2 并将其安装到/usr/local. OPENCVConfig.cmake文件在/usr/local/lib/cmake/opencv4目录中：

paul@paul-desktop:/usr/local/lib/cmake/opencv4$ dir
OpenCVConfig.cmake  OpenCVConfig-version.cmake  OpenCVModules.cmake  OpenCVModules-release.cmake

这是我CMakeLists.txt拼命尝试满足的文件find_package：

cmake_minimum_required(VERSION 3.16.2)
project(af VERSION 0.1.0 LANGUAGES CXX)

set(CPACK_PROJECT_NAME ${PROJECT_NAME})
set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_BUILD_PARALLEL_LEVEL 4)
set(CMAKE_PREFIX_PATH /usr/local/lib/cmake/opencv4)
set(ENV{OPENCV_DIR} /usr/local/lib/cmake/opencv4)
set(OPENCV_DIR /usr/local/lib/cmake/opencv4)

find_package(OPENCV REQUIRED)

add_executable(af main.cpp)

产生此错误：

[build] CMake Error at CMakeLists.txt:12 (find_package):
[build]   By not providing "FindOPENCV.cmake" in CMAKE_MODULE_PATH this project has
[build]   asked CMake to find a package configuration file provided by "OPENCV", but
[build]   CMake did not find one.
[build] 
[build]   Could not find a package configuration file provided by "OPENCV" with any
[build]   of the following names:
[build] 
[build]     OPENCVConfig.cmake
[build]     opencv-config.cmake
[build] 
[build]   Add the installation prefix of "OPENCV" to CMAKE_PREFIX_PATH or set
[build]   "OPENCV_DIR" to a directory containing one of the above files.  If "OPENCV"
[build]   provides a separate development package or SDK, be sure it has been
[build]   installed.

当我打开CMakeCache.txt并cmake-gui手动设置OPENCV_DIR为 时/usr/local/lib/cmake/opencv4，我遇到了同样的错误并OPENCV_DIR变为 OPENCV_DIR-NOTFOUND.

这里发生了什么？在我看来，我正在满足错误消息中列出的要求以及我可以在类似问题的答案中找到的任何好的建议。

我不确定这是否重要，但/usr/share/OpenCV/OpenCVConfig.cmake属于不同版本的 OpenCV。

标签： c++opencvcmake

解决方案

包名区分大小写。并且使用的 OpenCV 包的正确名称find_package是OpenCV，不是OPENCV。

实际上，CMake 中唯一不区分大小写的是宏/函数名称。其他所有内容都区分大小写。

一些变量和文件使用名称的大写或小写转换。例如OPENCV_DIR，变量使用大写的包名，而opencv-config.cmake文件使用小写的包名。但这并不否认区分大小写的方面。

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