CMake找不到cpp-netlib库

Question

我最近开始学习CMake，并决定将它与我正在进行的一个旧项目一起使用。该项目以cpp、boost和Openssl作为依赖项。这是我想出的工作CMakeLists.txt文件。

CMAKE_MINIMUM_REQUIRED(VERSION 3.4.1)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
PROJECT(MangaMe)
INCLUDE_DIRECTORIES(includes)
ADD_EXECUTABLE(mangaMe src/mangaMe.cpp)

set(Boost_USE_MULTITHREADED ON)
FIND_PACKAGE(Boost 1.59.0 REQUIRED COMPONENTS system thread filesystem)
INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(mangaMe ${Boost_LIBRARIES})

SET(OPENSSL_LIB_DIR /usr/local/Cellar/openssl/1.0.2e/lib)
INCLUDE_DIRECTORIES(/usr/local/Cellar/openssl/1.0.2e/include)
TARGET_LINK_LIBRARIES(mangaMe ${OPENSSL_LIB_DIR}/libcrypto.dylib ${OPENSSL_LIB_DIR}/libssl.dylib)

#WHY DOESNT THIS WORK!?!??!!?
#FIND_PACKAGE(cppnetlib 0.11 REQUIRED COMPONENTS client-connections server-parsers uri)
#INCLUDE_DIRECTORIES(${cppnetlib_INCLUDE_DIRS})
#TARGET_LINK_LIBRARIES(mangaMe ${cppnetlib_LIBRARIES})

SET(CPPNETLIB_LIB_DIR /usr/local/Cellar/cpp-netlib/0.11.2/lib)
INCLUDE_DIRECTORIES(/usr/local/Cellar/cpp-netlib/0.11.2/include)
TARGET_LINK_LIBRARIES(mangaMe ${CPPNETLIB_LIB_DIR}/libcppnetlib-client-connections.a ${CPPNETLIB_LIB_DIR}/libcppnetlib-server-parsers.a ${CPPNETLIB_LIB_DIR}/libcppnetlib-uri.a)

我想知道是否有人知道为什么使用FIND_PACKAGE查找cppnetlib的注释删除部分不能工作？我使用自制语言安装cpp-netlib，当我运行if(cppnetlib_FOUND)时，我知道它找到了包，但是它似乎找不到库，所以当我尝试进行项目时，它会出错，说它缺少cpp-netlib中的库。我还注意到，当我将FIND_PACKAGE中的版本设置为0.11.2 (当前安装的版本)时，我会收到一条消息：

-- Boost version: 1.59.0
-- Found the following Boost libraries:
--   system
--   thread
--   filesystem
CMake Error at CMakeLists.txt:16 (FIND_PACKAGE):
  Could not find a configuration file for package "cppnetlib" that is
  compatible with requested version "0.11.2".

  The following configuration files were considered but not accepted:

    /usr/local/lib/cmake/cppnetlib/cppnetlibConfig.cmake, version: 0.11.1
    /usr/local/lib/cmake/cppnetlib/cppnetlibConfig.cmake, version: 0.11.1



-- Configuring incomplete, errors occurred!
See also "/Users/LittleNewt/gitness/mangaMe/build/CMakeFiles/CMakeOutput.log".

这并不是什么大问题，因为当我明确指定目录时，它可以工作，但我仍然想知道为什么我不能只使用FIND_PACKAGE。

Answer 1

尝试将cppnetlib_INCLUDE_DIRS改为CPPNETLIB_INCLUDE_DIRS，将cppnetlib_LIBRARIES更改为CPPNETLIB_LIBRARIES。

前缀不是按包名，而是由包的CMake文件中导出的。下面是使用大写字母的源代码：https://github.com/cpp-netlib/cpp-netlib/blob/master/cppnetlibConfig.cmake.in