I try to use jsoncpp library with c++ on Ubuntu.
I compiled the code and built the library with scons.
Now I can compile a simple programme:
#include "json/json.h"
#include <json/value.h>
#include <json/writer.h>
int main()
{
return 0;
}
I use this command to compile:
g++ test.cpp -usr/lib/libjson_linux-gcc-4.8_libmt
I conclude that the compiler knows where to find the library.
The problem comes when I declare a json object:
Json::Value root;
Then I have this error message:
undefined reference to « Json::Value::Value(Json::ValueType) »
How can I fix this problem?
For CodeBlocks (Ubuntu 14.04)
I have faced same problem in my codeblocks IDE after installing jsconcpp. This is how I rectified my problem.
Got to project>Build Options>linker settings and in the link libraries add jsconcpp and click ok
Related
I'm trying to use the boost library on CodeBlocks, but I'm new to it and I can't seem to be able to link it properly.
The boost folder(version 1.70) is in the same folder of my main.cpp, and the library I'm trying to access is libboost_filesystem-mgw92-mt-x64-1_70.a;
Here is my code:
#include <iostream>
#include <boost/filesystem.hpp>
int main()
{
boost::filesystem::path l_path("C:\\Hello.txt");
if(boost::filesystem::exists(l_path))
{
std::cout<<"exists!"<<std::endl;
}
else
{
std::cout<<"no";
}
return 0;
}
And some screenshots of my settings and of the error
Thank you!
Undefined reference to _Unwind_Resume suggests that you build Boost with different compiler than your project or you choose different type of exception handling.
Check if you're using the same compiler in both cases.
It might be also caused by building your project using gcc instead of g++. You should check that as well. In this case switch to g++ or explicitly link against libstdc++, by adding -lstdc++ to compiler flags.
I've compiled some of my code into a static library. Everything from this library begins with Glow or GLOWE prefix. At the moment, I'm testing the library in Linux (Ubuntu 14.04). I made a simple program to check if I did everything correctly.
#include <GlowSystem/Package.h>
int main(void)
{
GLOWE::Package package;
return 0;
}
GLOWE::Package is a class. It uses libzip and zlib (and standard c++ files eg. string). I link both libzip and zlib. When I try to compile, it fails with some linking errors.
Build log (at pastebin)
I thought that these errors are caused by too old libstdc++, but this code compiles:
#include <string>
using namespace std;
int main(void)
{
string a;
a.resize(5000);
return 0;
}
I'm at my wits' end and I have no idea what to do. I will appreciate any help.
It looks like your linker options are incorrect:
../GlowE/GlowEngine/bin/Debug/libGlowEngine.a /usr/lib/x86_64-linux-gnu/libzip.a /usr/lib/x86_64-linux-gnu/libz.a
Try:
-l../GlowE/GlowEngine/bin/Debug/GlowEngine -l/usr/lib/x86_64-linux-gnu/zip -l/usr/lib/x86_64-linux-gnu/z
I am trying to use botan library with eclipse. I have compiled botan using Ubuntu and I created small program as follow
#include <botan/botan.h>
int main()
{
LibraryInitializer init;
return 0;
}
But I have got fatal error: botan/build.h: No such file or directory
Thanks in advance and waiting for help.
You need to add to your gcc command line the -lbotan option in order to compile correctly.
I am trying to switch to Windows environment from Linux, but find it a very hard path.
This time I wanted to test if I can work with boost library.
I had problems with compiling boost on windows, so I downloaded precompiled version. I unpacked everything and tested positively that I can compile the header-only librariers.
Then I copied some simple boost::asio example. I set up everything in Eclipse. Compilation went fine, but during linking I got 'undefined reference' problem to 'boost::system' internal stuff.
C:/Users/jacek/cpp/boost_1_62_0/boost/system/error_code.hpp:221: undefined reference to `boost::system::generic_category()'
C:/Users/jacek/cpp/boost_1_62_0/boost/system/error_code.hpp:222: undefined reference to `boost::system::generic_category()'
C:/Users/jacek/cpp/boost_1_62_0/boost/system/error_code.hpp:223: undefined reference to `boost::system::system_category()'
So I added '-lboost_system', as well as the path to the libraries directory, to my linking options. But this did not help.
g++ "-LC:\\Users\\jacek\\cpp\\boost_1_62_0\\lib64-msvc-14.0" -o TestAsio.exe "src\\Main.o" -lboost_system
I checked the libraries directory and found there is a bunch of files containing 'boost_system' in the name. They are:
libboost_system-vc140-mt-1_62.lib
libboost_system-vc140-mt-gd-1_62.lib
libboost_system-vc140-mt-s-1_62.lib
libboost_system-vc140-mt-sgd-1_62.lib
libboost_system-vc140-s-1_62.lib
libboost_system-vc140-sgd-1_62.lib
I did not know which I should use. I tried adding 'libboost_system-vc140-mt-1_62' to the linking options, I tried all other files, I tried renaming the files to the linux pattern 'libboost_system.a', but nothing worked.
g++ "-LC:\\Users\\jacek\\cpp\\boost_1_62_0\\lib64-msvc-14.0" -o TestAsio.exe "src\\Main.o" -llibboost_system-vc140-mt-1_62 -llibboost_system-vc140-mt-gd-1_62 -llibboost_system-vc140-mt-s-1_62 -llibboost_system-vc140-mt-sgd-1_62 -llibboost_system-vc140-s-1_62 -llibboost_system-vc140-sgd-1_62
What am I doing wrong here?
Please help...
YotKay
I solved it myself with the help of a comment from this post: boost asio example compilation error
It looks like the precompiled version of Boost is created with Visual Studion and is NOT COMPATIBLE with G++. I if I decided to install MinGW then I cannot use the precompiled version of boost, but must compile it myself using g++.
I did that.
Now I have libraries compiled with G++.
I specify the path to the boost system library like that:
c:\Users\jacek\cpp\boost_1_62_0\libraries\boost\bin.v2\libs\system\build\gcc-mingw-6.2.0\debug\link-static\
and add this option:
-lboost_system-mgw62-d-1_62
Now the problem with boost::system disappears. However, another one pops up with boost asio, but luckily the answer is here: MinGW linker error: winsock
The example works fine now on my Windows 10 laptop.
#include <boost/asio/io_service.hpp>
#include <boost/asio/steady_timer.hpp>
#include <chrono>
#include <iostream>
using namespace boost::asio;
int main()
{
io_service ioservice;
steady_timer timer{ioservice, std::chrono::seconds{3}};
timer.async_wait([](const boost::system::error_code &ec)
{ std::cout << "3 sec\n"; });
ioservice.run();
}
If I try to compile and run this
#include <string>
int main()
{
std::string strs[5];
return 0;
}
I get an error message of
The procedure entry point ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC1Ev could not be located in the dynamic link library (path to exe).
I am using mingw-w64 gcc version 6.2.0 (i686-posix-dwarf-rev1) and have already tried (i686-posix-sjlj-rev1).
Is there another compiler version that does not encounter this bug or something I can do to my code to make it compile?