向cmake项目添加RxCpp库

Question

我想在Linux上使用RxCpp (gcc)，但是我很难在RxCpp项目中适当地添加RxCpp库。我按照克隆和构建指令运行：

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

我试图运行make install，但得到：

make: *** No rule to make target 'install'.  Stop.

然后，我注意到构建目录中的文件libRxCpp.so并复制了它：

cp libRxCpp.so /sw/RxCpp/2.3.0/

我在克里恩中创建了一个新项目，它使用cmake并修改了CMakeLists.txt，如下所示：

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})

但是，在更新cmake项目(或在终端中运行cmake )时，会出现一个错误：

CMake Error at CMakeLists.txt:9 (target_link_libraries):
  Cannot specify link libraries for target "RxCpp_Example" which is not built
  by this project.

我做错了什么？如何将RxCpp库添加到cmake项目中？

Answer 1

在用target_link_libraries创建目标之前调用了add_executable。更改您的cmake文件如下：

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})