Undefined reference to symbol X509_free - c++

I'm trying to use the mongodb legacy C++ driver. (Here "legacy" means the production version, fwiw.) On an ubuntu 15.04 host using clang++ 3.6 and boost 1.55 (from the ubuntu package repositories) and using mongo-cxx-driver pulled form git, I compiled the driver and then attempted to compile the test program.
$ clang++ -std=c++14 mongo.cc -pthread -lmongoclient -lboost_thread \
-lboost_system -lboost_regex -lssl -o mo
I see this error:
clang++ -std=c++14 mongo.cc -pthread -lmongoclient -lboost_thread -lboost_system -lboost_regex -lssl -lcrypt -o mo
/usr/bin/ld: /usr/local/lib/libmongoclient.a(ssl_manager.o): undefined reference to symbol 'X509_free##OPENSSL_1.0.0'
/lib/x86_64-linux-gnu/libcrypto.so.1.0.0: error adding symbols: DSO missing from command line
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Clearly I'm missing X509_free(), but it appears that should be in libssl (which is openSSL1.0.0, says dpkg and the library symlink itself).
Many thanks for any tips.
I don't think it's important here, but this is mongo.cc:
#include <cstdlib>
#include <iostream>
#include "mongo/client/dbclient.h" // for the driver
void run() {
mongo::DBClientConnection c;
c.connect("localhost");
}
int main() {
mongo::client::initialize();
try {
run();
std::cout << "connected ok" << std::endl;
} catch( const mongo::DBException &e ) {
std::cout << "caught " << e.what() << std::endl;
}
return EXIT_SUCCESS;
}

You should link against libcrypto.so, not libcrypt.so.

Related

C++ Boost Example: Creating and Managing Threads (Compilation Error)

I am currently using Boost 1.54.0. I am following the code from this example.
example_44_01.cpp
#include <boost/thread.hpp>
#include <boost/chrono.hpp>
#include <iostream>
void wait(int seconds)
{
boost::this_thread::sleep_for(boost::chrono::seconds{seconds});
}
void thread()
{
for (int i = 0; i < 5; ++i)
{
wait(1);
std::cout << i << std::endl;
}
}
int main(int argc, char** argv)
{
boost::thread t{thread};
t.join();
return 0;
}
So, it looks like all I need is the -lboost_thread, and -lboost_chrono libraries to link to at compile time. I also added the -lboost_system.
Here are my execution scripts.
g++-7 -Wall -std=c++1z -g -c example_44_01.cpp -o example_44_01.o
g++-7 -Wall -std=c++1z -g example_44_01.o -o example_44_01 -lboost_system -lboost_thread -lboost_chrono &>result.txt
What's going on here? This is the result.txt file:
example_44_01.o: In function `boost::this_thread::sleep_for(boost::chrono::duration<long, boost::ratio<1l, 1000000000l> > const&)':
/usr/local/include/boost/thread/pthread/thread_data.hpp:243: undefined reference to `boost::this_thread::hidden::sleep_for(timespec const&)'
collect2: error: ld returned 1 exit status
I've compiled and linked other programs with the same libraries without error. So is the error in the code? This seems doubtful as the code is straight from the documentation. Any insight is appreciated.
I had this issue once because I was indeliberately using different versions of Boost (I had first installed Boost from commandline, then a few months later on, manually from zip).
Try adding the path to your Boost libraries to the compiler. For instance, if your libraries are stored at /usr/local/lib, try:
g++-7 -Wall -std=c++1z -g example_44_01.o -o example_44_01 -L/usr/local/lib -lboost_system -lboost_thread -lboost_chrono &>result.txt

-bash ./foo: No such file or directory after compilation

I'm compiling a program named benchmark_Quickthread_01.cpp:
#include <quickthread/QuickThread.h>
#include <iostream>
using namespace qt;
int main()
{
qtInit qtInit( -1 );
std::cout << "Blub\n" << std::endl;
return 0;
}
with compiler options:
g++ -L /usr/local/lib64/ -static ./benchmark_Quickthread_01.cpp -lQuickThread
-o qt.exe -pthread -Wl,-Bdynamic -lnuma -ldl -lrt -Wall
compiler gives no errors. However when I try running the file, bash gives me following error:
-bash: ./qt.exe: No such file or directory
File exists, I can ls, cat and check size ('du -h qt.exe' = 272K)
What might cause the problem?
-static and -Wl,-Bdynamic are conflicting. Remove one or the other, and try again.

Can't compile code with CVC4 C++ API

I am just trying to compile this file helloworld.cpp
#include <iostream>
#include <cvc4/cvc4.h>
using namespace CVC4;
int main() {
ExprManager em;
Expr helloworld = em.mkVar("Hello World!", em.booleanType());
SmtEngine smt(&em);
std::cout << helloworld << " is " << smt.query(helloworld) << std::endl;
return 0;
}
using g++ helloworld.cpp -lcvc4 -o helloworld -lcvc4 -Wno-deprecated. But it is giving me this error
/tmp/cc9SFpL4.o: In function `main':
helloworld.cpp:(.text+0xac): undefined reference to `CVC4::ExprManager::mkVar(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CVC4::Type, unsigned int)'
collect2: error: ld returned 1 exit status
Help!
I have installed CVC4 adding repo link in /etc/apt/sources.list and then calling sudo apt-get install cvc4 libcvc4-dev libcvc4parser-dev.
EDIT: I mistyped g++ helloworld.cpp -lcvc4 ... I used g++ helloworld.cpp -o helloworld -lcvc4 -Wno-deprecated. Actually I used all combinations, permutations.
This seems to be a problem with the OP's environment. Both r4C9rAyrd6A1 and I were able to compile the example on our local machines. The specific issue might have been that the OP's compiler wanted the -lcvc4 linker flag after the other flags, e.g. g++ helloworld.cpp -Wno-deprecated -o helloworld -lcvc4 as mentioned in the comments.

Errors linking to Boost system

I've built Boost 1.59 for MinGW 4.9.2 32bit as follows:
bootstrap.bat mingw
b2 --prefix=%USERPROFILE%\Code\Libraries\boost toolset=gcc install (these are static libraries)
When trying to compile:
#include <iostream>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace std;
int main()
{
boost::asio::io_service io;
boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
t.wait();
cout << "Hello World!" << endl;
return 0;
}
With:
g++ -o test -L %USERPROFILE%\Code\Libraries\boost\lib -l boost_system-mgw49-mt-1_59 -I %USERPROFILE%\Code\Libraries\boost\include\boost-1_59 main.cpp
I get this error:
C:\Users\Brady\AppData\Local\Temp\ccsbGjrk.o:main.cpp:(.text+0x193): undefined reference to `boost::system::generic_category()'
C:\Users\Brady\AppData\Local\Temp\ccsbGjrk.o:main.cpp:(.text+0x19d): undefined reference to `boost::system::generic_category()'
C:\Users\Brady\AppData\Local\Temp\ccsbGjrk.o:main.cpp:(.text+0x1a7): undefined reference to `boost::system::system_category()'
C:/Program Files (x86)/QT/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: C:\Users\Brady\AppData\Local\Temp\ccsbGjrk.o: bad reloc address 0xe in section `.text$_ZN5boost6system14error_categoryD2Ev[__ZN5boost6system14error_categoryD2Ev]'
collect2.exe: error: ld returned 1 exit status
I'm getting this same error across 2 computers. Any help is appreciated!
It's a linker error. You need to link to the Boost System library.
Do this
g++ -o test -L %USERPROFILE%\Code\Libraries\boost\lib -lboost_system -I %USERPROFILE%\Code\Libraries\boost\include\boost-1_59 main.cpp

xerces-c++ compile/linking question

After installing Xerces-C++ (XML library):
./configure --disable-shared
./make
./make-install
ldconfig
And writing the simple program (xmlval.cpp):
#include <stdio>
#include <xercesc/dom/DOM.hpp>
int main()
{
std::cout << "HI" << std::endl;
}
And compiling:
/usr/bin/g++ -L/usr/local/lib -I/usr/local/include -o xmlval xmlval.cpp /usr/local/lib/libxerces-c.a
The compile result is a bunch of lines like:
/usr/local/lib/libxerces-c.a(CurlNetAccessor.o): In function `xercesc_3_0::CurlNetAccessor::cleanupCurl()':
/home/stullbd/xerces-c-3.0.1/src/xercesc/util/NetAccessors/Curl/CurlNetAccessor.cpp:78: undefined reference to `curl_global_cleanup'
/usr/local/lib/libxerces-c.a(CurlNetAccessor.o): In function `xercesc_3_0::CurlNetAccessor::initCurl()':
/home/stullbd/xerces-c-3.0.1/src/xercesc/util/NetAccessors/Curl/CurlNetAccessor.cpp:70: undefined reference to `curl_global_init'
/usr/local/lib/libxerces-c.a(CurlURLInputStream.o): In function `~CurlURLInputStream':
/home/stullbd/xerces-c-3.0.1/src/xercesc/util/NetAccessors/Curl/CurlURLInputStream.cpp:168: undefined reference to `curl_multi_remove_handle'
Any thoughts on this?
You seem to miss linking with curl, try adding -lcurl.