将RxCpp库添加到cmake项目

问题描述

我想在Linux（gcc）上使用，但我很难将RxCpp库适当地添加到我的项目中。我遵循克隆和构建指令并运行：

  git clone --recursive https://github.com/Reactive-Extensions/ RxCpp.git 
 cd RxCpp 
 
 mkdir projects / build 
 cd projects / build 
 cmake -GUnix Makefiles-DCMAKE_C_COMPILER = gcc -DCMAKE_CXX_COMPILER = g ++ -DCMAKE_BUILD_TYPE = RelWithDebInfo -B。 ../CMake 
 make 
  

我试着运行 make install 但是得到：

  make：***没有规则使目标'安装'。停止。 
  

然后，我注意到文件 libRxCpp.so 在我的构建目录中并复制它：

  cp libRxCpp.so /sw/RxCpp/2.3.0/ 
  

我在，它使用cmake并修改 CMakeLists.txt 像这样：

<$ p

$ b set（CMAKE_CXX_FLAGS$ {CMAKE_CXX_FLAGS} -std = c ++ 11）$ b $ cmake_minimum_required（VERSION 3.6）
project（RxCpp_Example） b
＃我尝试添加库RxCpp
set（RxCpp_Lib_PATH /sw/RxCpp/2.3.0/）
find_library（RxCpp_Lib NAMES libRxCpp.so PATHS $ {RxCpp_Lib_PATH}）
target_link_libraries（RxCpp_Example $ {RxCpp_Lib}）

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

但是，在更新cmake项目（或在终端中运行cmake）时出现错误：

  CMake错误在CMakeLists.txt：9（target_link_libraries）：
无法为目标RxCpp_Example指定链接库，该目标不是由该项目构建的
。 
  

我做错了什么？如何将RxCpp库添加到我的cmake项目中？

解决方案

您调用 target_link_libraries 在用 add_executable 创建目标之前。改变你的cmake文件是这样的：

  find_library（RxCpp_Lib NAMES libRxCpp.so PATHS $ {RxCpp_Lib_PATH}）
 
 set（SOURCE_FILES main.cpp）
 add_executable（RxCpp_Example $ {SOURCE_FILES}）
 
 target_link_libraries（RxCpp_Example $ {RxCpp_Lib}）
  pre> 
I'd like to use RxCpp on Linux (gcc), but I have trouble to add RxCpp library appropriately to my cmake project. I followed cloning and building instructions and ran:
git clone --recursive https://github.com/Reactive-Extensions/RxCpp.git
cd RxCpp

mkdir projects/build
cd projects/build
cmake -G"Unix Makefiles" -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_BUILD_TYPE=RelWithDebInfo -B. ../CMake
make
I tried to run make install but got:
make: *** No rule to make target 'install'.  Stop.
Then, I noticed the file libRxCpp.so in my build directory and copied it:
cp libRxCpp.so /sw/RxCpp/2.3.0/
I created a new project in Clion, which uses cmake and modified CMakeLists.txt like this:
cmake_minimum_required(VERSION 3.6)
project(RxCpp_Example)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

# my try to add library RxCpp
set(RxCpp_Lib_PATH /sw/RxCpp/2.3.0/)
find_library(RxCpp_Lib NAMES libRxCpp.so PATHS ${RxCpp_Lib_PATH})
target_link_libraries(RxCpp_Example ${RxCpp_Lib})

set(SOURCE_FILES main.cpp)
add_executable(RxCpp_Example ${SOURCE_FILES})
However, I get an error when updating the cmake project (or running cmake in terminal):
CMake Error at CMakeLists.txt:9 (target_link_libraries):
  Cannot specify link libraries for target "RxCpp_Example" which is not built
  by this project.
What am I doing wrong? How can I add RxCpp library to my cmake project?
 解决方案 
You called target_link_libraries before creating the target with add_executable. Change your cmake file like this:
find_library(RxCpp_Lib NAMES libRxCpp.so PATHS ${RxCpp_Lib_PATH})

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

target_link_libraries(RxCpp_Example ${RxCpp_Lib})
                        
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