CMake 找不到 cpp-netlib 库

Question

我最近开始学习 CMake，并决定将它用于我正在处理的一个旧项目。该项目有 cpp-netlib、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 的注释部分不起作用？我使用自制软件安装 cpp-netlib，当我运行一个 if(cppnetlib_FOUND) 我知道它找到了包，但它似乎找不到库，所以当我尝试使我的项目出错时说它缺少 cpp-netlib 中的库。我还注意到，当我在 FIND_PACKAGE 中将版本设置为 0.11.2（当前安装的版本）时，我收到一条消息说

-- 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".

没什么大不了的，因为当我明确指定目录时它会起作用，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 更改为 CPPNETLIB_INCLUDE_DIRS，将 cppnetlib_LIBRARIES 更改为 CPPNETLIB_LIBRARIES。

前缀不是包名称，而是包的 CMake 文件中导出的内容。这是使用大写字母的来源：https://github.com/cpp-netlib/cpp-netlib/blob/master/cppnetlibConfig.cmake.in

CMake 找不到 cpp-netlib 库

CMake can't find cpp-netlib libraries

c++

cmake

cpp-netlib