如何将jsoncpp与cmake连接
如何将jsoncpp与cmake连接
提问于 2021-06-02 21:02:00
我无法找到将jsoncpp与我的可执行文件连接起来的方法。我尝试过许多事情，但都没有成功：
- 链接jsoncpp_lib
- 还有什么是写的这里
我想使用ubuntu附带的jsoncpp库。有人成功这么做了吗？
$ ls /usr/lib/x86_64-linux-gnu/libjsoncpp.*
/usr/lib/x86_64-linux-gnu/libjsoncpp.a /usr/lib/x86_64-linux-gnu/libjsoncpp.so.1
/usr/lib/x86_64-linux-gnu/libjsoncpp.so /usr/lib/x86_64-linux-gnu/libjsoncpp.so.1.7.4CMakeLists.txt
cmake_minimum_required(VERSION 3.8.0 FATAL_ERROR)
project(jsoncpp_example)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -stdlib=libc++ -Wall -Werror")
set(CMAKE_EXE_LINKER_FLAGS "-lstdc++ -lpthread")
add_executable(parse main.cpp)
target_include_directories(parse PRIVATE include)
target_link_libraries(parse jsoncpp)Parser.h
#ifndef MY_PARSER_H
#define MY_PARSER_H
#include <vector>
#include <fstream>
#include <jsoncpp/json/json.h>
class MyParser {
public:
MyParser() = default;
~MyParser() = default;
inline static
Json::Value parse(const char* inputFile) {
Json::Value val;
std::ifstream ifs(inputFile);
Json::Reader reader;
reader.parse(ifs, val);
return val;
}
};
#endif /* MY_PARSER_H */main.cpp
#include <iostream>
#include "Parser.h"
int main(){
Json::Value val = MyParser::parse("input.json");
std::cout << val["name"] << std::endl;
}Ubuntu 18.04，用部落-8.0编译
CXX=clang-8 cmake ..
make -j我所犯的错误
Scanning dependencies of target parse
[ 50%] Building CXX object CMakeFiles/parse.dir/main.cpp.o
[100%] Linking CXX executable parse
CMakeFiles/parse.dir/main.cpp.o: In function `main':
main.cpp:(.text+0x3e): undefined reference to `Json::operator<<(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, Json::Value const&)'
CMakeFiles/parse.dir/main.cpp.o: In function `MyParser::parse(char const*)':
main.cpp:(.text._ZN8MyParser5parseEPKc[_ZN8MyParser5parseEPKc]+0x349): undefined reference to `Json::Reader::parse(std::__1::basic_istream<char, std::__1::char_traits<char> >&, Json::Value&, bool)'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
CMakeFiles/parse.dir/build.make:94: recipe for target 'parse' failed
make[2]: *** [parse] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/parse.dir/all' failed
make[1]: *** [CMakeFiles/parse.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2Stack Overflow用户
回答已采纳
发布于 2021-06-02 22:38:48
维基提到
get_target_property(JSON_INC_PATH jsoncpp_lib INTERFACE_INCLUDE_DIRECTORIES)
include_directories(${JSON_INC_PATH})
target_link_libraries(${PROJECT_NAME} jsoncpp_lib)但我自己无法让它发挥作用。如果将jsoncpp .cmake文件安装在自动搜索的位置，则可以选择：
cmake_minimum_required(VERSION 3.8.0 FATAL_ERROR)
project(jsoncpp_example)
find_package(PkgConfig REQUIRED)
pkg_check_modules(JSONCPP jsoncpp)
set(CMAKE_THREAD_PREFER_PTHREAD TRUE) # these are to use the prefered -pthread flag
set(THREADS_PREFER_PTHREAD_FLAG TRUE) # over the -lpthread option
find_package(Threads REQUIRED)
add_executable(parse main.cpp)
set_property(TARGET parse PROPERTY CXX_STANDARD 17)
target_compile_options(parse PRIVATE -Wall -Werror)
target_link_libraries(parse PRIVATE Threads::Threads ${JSONCPP_LIBRARIES})页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67812541
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