I'm playing around with developing a cross-platform C++ project. Things build fine on Linux, but on Windows (10) + MSys2 I've run into a strange issue. Compile works fine (picks up my include dirs, etc.), but linking fails with all sorts of undefined reference errors to a static imported library I have, and even the C++ runtime.
I've tried setting CMAKE_C[XX]_COMPILER, CMAKE_MAKE_PROGRAM, but the output from the configuration step is always the same:
$ cmake ..
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19041 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting C compiler ABI info
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19041 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /mingw64/bin/cc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19041 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /mingw64/bin/CC.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: <....>
As mentioned earlier the compile works, but linking the executable fails spectacularly. Here is my minimal working example:
$ cat ../CMakeLists.txt
project(example)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
add_executable(example
main.cpp
)
Here is an sample of the output (the rest is omitted for brevity):
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.cpp.obj:main.cpp:(.text+0x51): undefined reference to `std::ios_base::Init::~Init()'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.cpp.obj:main.cpp:(.text+0x81): undefined reference to `std::ios_base::Init::Init()'
Adding -v to cmake produces the following commands.
Compile:
/mingw64/bin/CC.exe -std=gnu++17 -o CMakeFiles/example.dir/main.cpp.obj -c /home/.../Development/minex/main.cpp
Link:
/mingw64/bin/CC.exe CMakeFiles/example.dir/main.cpp.obj -o example
CC.exe seems off... and it's used if I set the CXX compiler flag or not...
I also tried generating "MSYS2 Makefiles" but that also fails (doesn't know the generator).
I can reproduce the output by running
$ CC main.cpp -o example
while
$ g++ main.cpp -o example
works fine.
CMake version is 3.18.4.
Edit: This is the entire output of running make VERBOSE=1 (using mingw64-cmake seems to produce the same output, except the 'entering directory' and 'leaving directory' paths are absolute windows paths):
$ cat log
/usr/bin/cmake.exe -S/home/<...>/Development/minex -B/home/<...>/Development/minex/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake.exe -E cmake_progress_start /home/<...>/Development/minex/build/CMakeFiles /home/<...>/Development/minex/build//CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/<...>/Development/minex/build'
make -f CMakeFiles/example.dir/build.make CMakeFiles/example.dir/depend
make[2]: Entering directory '/home/<...>/Development/minex/build'
cd /home/<...>/Development/minex/build && /usr/bin/cmake.exe -E cmake_depends "Unix Makefiles" /home/<...>/Development/minex /home/<...>/Development/minex /home/<...>/Development/minex/build /home/<...>/Development/minex/build /home/<...>/Development/minex/build/CMakeFiles/example.dir/DependInfo.cmake --color=
Dependee "/home/<...>/Development/minex/build/CMakeFiles/example.dir/DependInfo.cmake" is newer than depender "/home/<...>/Development/minex/build/CMakeFiles/example.dir/depend.internal".
Dependee "/home/<...>/Development/minex/build/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "/home/<...>/Development/minex/build/CMakeFiles/example.dir/depend.internal".
Scanning dependencies of target example
make[2]: Leaving directory '/home/<...>/Development/minex/build'
make -f CMakeFiles/example.dir/build.make CMakeFiles/example.dir/build
make[2]: Entering directory '/home/<...>/Development/minex/build'
[ 50%] Building CXX object CMakeFiles/example.dir/main.obj
/mingw64/bin/CC.exe -std=gnu++17 -o CMakeFiles/example.dir/main.obj -c /home/<...>/Development/minex/main.cpp
[100%] Linking CXX executable example
/usr/bin/cmake.exe -E cmake_link_script CMakeFiles/example.dir/link.txt --verbose=1
/mingw64/bin/CC.exe CMakeFiles/example.dir/main.obj -o example
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.obj:main.cpp:(.text+0x23): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.obj:main.cpp:(.text+0x32): undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.obj:main.cpp:(.text+0x51): undefined reference to `std::ios_base::Init::~Init()'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.obj:main.cpp:(.text+0x81): undefined reference to `std::ios_base::Init::Init()'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.obj:main.cpp:(.rdata$.refptr._ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_[.refptr._ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_]+0x0): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/example.dir/main.obj:main.cpp:(.rdata$.refptr._ZSt4cout[.refptr._ZSt4cout]+0x0): undefined reference to `std::cout'
collect2.exe: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/example.dir/build.make:103: example] Error 1
make[2]: Leaving directory '/home/<...>/Development/minex/build'
make[1]: *** [CMakeFiles/Makefile2:95: CMakeFiles/example.dir/all] Error 2
make[1]: Leaving directory '/home/<...>/Development/minex/build'
make: *** [Makefile:103: all] Error 2
Solution:
I was setting CMAKE_CXX_COMPILER wrong :/. I was doing it from memory, and I just did
CMAKE_CXX_COMPILER=... cmake ..
not
cmake .. -DCMAKE_CXX_COMPILER=...
However! It's still weird that CC is used to successfully compile cpp files, but it can't link the object files.
If you are using mingw64 compiler in MSYS2 make sure you are using mingw64 version of cmake too.
Using cmake not aligned with gcc e.g.:
MINGW64
# which gcc
/mingw64/bin/gcc
MINGW64
# which cmake
/usr/bin/cmake
Will led to following error when running cmake:
...
-- The CXX compiler identification is GNU 10.2.0
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19041 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
...
and linker error in build step.
So make sure you install mingw64 version of cmake:
MINGW64
pacman -S mingw-w64-x86_64-cmake
You need to close terminal and open it again after cmake is installed. Then make sure you have aligned versions of gcc and cmake installed:
MINGW64
# which gcc
/mingw64/bin/gcc
MINGW64
# which cmake
/mingw64/bin/cmake
Now cmake should work properly.
You have these errors because you are trying to compile/link c++ program with a c compiler. For example the two undefined references you are mentioning are part of libstdc++. It is used by default when using g++ but not with CC. If you want to use CC you have to add it manually -lstdc++.
The easiest way is to compile and link c++ programs by using g++.
For some reason the /mingw64/bin/CC.exe is considered as the CXX compiler and the working detection is skipped. to avoid the skipp of the working detection you can add set(CMAKE_CXX_COMPILER_WORKS 1). to modify the compiler it self you can set CMAKE_CXX_COMPILER as explained in CMAKE_CXX_COMPILER or set CXX as explained in CXX . be careful to clean the cache.
Related
I have a strange problem, when I try to build a simple Boost test program on a cluster.
On my machine, everything works just fine.
First the example:
//main.cpp
#include <iostream>
#include <string>
#include "boost/program_options.hpp"
namespace po = boost::program_options;
int main( int argc , char* argv[] ) {
po::options_description desc("Allowed options");
desc.add_options()
("help", "produce help message")
("greet", po::value<std::string>()->default_value("World"), "the greeting")
;
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);
std::cout << "Hello, " << vm["greet"].as<std::string>() << "!" << std::endl;
return 0;
}
And the CMakeLists.txt
cmake_minimum_required(VERSION 3.5)
project(boost_test)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
find_package(Boost COMPONENTS program_options)
set(SOURCE_FILES main.cpp)
if(Boost_FOUND)
add_executable(boost_test ${SOURCE_FILES})
target_include_directories(boost_test PRIVATE ${Boost_INCLUDE_DIRS})
target_link_libraries(boost_test PRIVATE ${Boost_LIBRARIES})
endif(Boost_FOUND)
I use cmake like
cmake -G "Unix Makefiles" /path/to/code
make
The error I get is a undefined reference error during linking:
Linking CXX executable boost_test
CMakeFiles/boost_test.dir/main.cpp.o: In function `main':
main.cpp:(.text+0x6d): undefined reference to `boost::program_options::options_description::options_description(std::string const&, unsigned int, unsigned int)'
CMakeFiles/boost_test.dir/main.cpp.o: In function `boost::program_options::variables_map::operator[](std::string const&) const':
main.cpp:(.text._ZNK5boost15program_options13variables_mapixERKSs[_ZNK5boost15program_options13variables_mapixERKSs]+0x1f): undefined reference to `boost::program_options::abstract_variables_map::operator[](std::string const&) const'
and so on ...
So I thought that maybe the installation of boost is not correct and I tried to write a makefile myself.
boost-test-1: ../code/main.cpp
g++ ../code/main.cpp -o boost-test-1 -lboost_program_options
boost-test-2: ../code/main.cpp
g++ ../code/main.cpp -o boost-test-2 /some/fancy/cluster/path/certainly/non/standard/Boost/lib/libboost_program_options.so
Both ways to build the program work fine. But what cmake is doing is basically the following: first, build a object file, second link the object file and the library together and that fails.
boost-test-3: ../code/main.cpp
/usr/bin/c++ -I/some/fancy/cluster/path/certainly/non/standard/Boost/include -std=c++11 -o main.cpp.o -c ../code/main.cpp
/usr/bin/c++ -std=c++11 main.cpp.o -o boost-test-3 /some/fancy/cluster/path/certainly/non/standard/Boost/lib/libboost_program_options.so
As already mentioned, on my computer all described ways to build the program work, but on the cluster, the cmake way unfortunately fails. The problem is that I have another larger project that uses cmake and I am looking for a way to build it on that particular cluster.
Do you have any idea what could cause the problem and how to solve it?
Thank you!
Update: This is the whole output of the build process. I shortened the paths to cmake and boost to "path/to/cmake" and "path/to/boost" to make it shorter and better readable, but it is the same long path as described above.
$ cmake -G "Unix Makefiles" ../code/
-- The C compiler identification is GNU 4.8.5
-- The CXX compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Boost version: 1.61.0
-- Found the following Boost libraries:
-- program_options
-- Boost include directories (Boost_INCLUDE_DIRS): /path/to/Boost/include
-- Link directories for Boost libraries (Boost_LIBRARY_DIRS): /path/to/Boost/lib
-- Boost component libraries to be linked (Boost_LIBRARIES): /path/to/Boost/lib/libboost_program_options.so
-- Configuring done
-- Generating done
-- Build files have been written to: /home/test/build
$ make VERBOSE=1
/path/to/CMake/bin/cmake -H/home/test/code -B/home/test/build --check-build-system CMakeFiles/Makefile.cmake 0
/path/to/CMake/bin/cmake -E cmake_progress_start /home/test/build/CMakeFiles /home/test/build/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/test/build'
make -f CMakeFiles/boost_test.dir/build.make CMakeFiles/boost_test.dir/depend
make[2]: Entering directory `/home/test/build'
cd /home/test/build && /path/to/CMake/bin/cmake -E cmake_depends "Unix Makefiles" /home/test/code /home/test/code /home/test/build /home/test/build /home/test/build/CMakeFiles/boost_test.dir/DependInfo.cmake --color=
Dependee "/home/test/build/CMakeFiles/boost_test.dir/DependInfo.cmake" is newer than depender "/home/test/build/CMakeFiles/boost_test.dir/depend.internal".
Dependee "/home/test/build/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "/home/test/build/CMakeFiles/boost_test.dir/depend.internal".
Scanning dependencies of target boost_test
make[2]: Leaving directory `/home/test/build'
make -f CMakeFiles/boost_test.dir/build.make CMakeFiles/boost_test.dir/build
make[2]: Entering directory `/home/test/build'
[ 50%] Building CXX object CMakeFiles/boost_test.dir/main.cpp.o
/usr/bin/c++ -I/path/to/Boost/include -std=c++11 -o CMakeFiles/boost_test.dir/main.cpp.o -c /home/test/code/main.cpp
[100%] Linking CXX executable boost_test
/path/to/CMake/bin/cmake -E cmake_link_script CMakeFiles/boost_test.dir/link.txt --verbose=1
/usr/bin/c++ -std=c++11 CMakeFiles/boost_test.dir/main.cpp.o -o boost_test /path/to/Boost/lib/libboost_program_options.so
CMakeFiles/boost_test.dir/main.cpp.o: In function `main':
main.cpp:(.text+0x6d): undefined reference to `boost::program_options::options_description::options_description(std::string const&, unsigned int, unsigned int)'
CMakeFiles/boost_test.dir/main.cpp.o: In function `boost::program_options::variables_map::operator[](std::string const&) const':
main.cpp:(.text._ZNK5boost15program_options13variables_mapixERKSs[_ZNK5boost15program_options13variables_mapixERKSs]+0x1f): undefined reference to `boost::program_options::abstract_variables_map::operator[](std::string const&) const'
CMakeFiles/boost_test.dir/main.cpp.o: In function `boost::program_options::basic_command_line_parser<char>::basic_command_line_parser(int, char const* const*)':
main.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcEC2EiPKPKc[_ZN5boost15program_options25basic_command_line_parserIcEC5EiPKPKc]+0x76): undefined reference to `boost::program_options::detail::cmdline::cmdline(std::vector<std::string, std::allocator<std::string> > const&)'
CMakeFiles/boost_test.dir/main.cpp.o: In function `boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::string, std::string>, std::string const&>)':
main.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE12extra_parserENS_9function1ISt4pairISsSsERKSsEE[_ZN5boost15program_options25basic_command_line_parserIcE12extra_parserENS_9function1ISt4pairISsSsERKSsEE]+0x33): undefined reference to `boost::program_options::detail::cmdline::set_additional_parser(boost::function1<std::pair<std::string, std::string>, std::string const&>)'
CMakeFiles/boost_test.dir/main.cpp.o: In function `std::vector<std::string, std::allocator<std::string> > boost::program_options::to_internal<std::string>(std::vector<std::string, std::allocator<std::string> > const&)':
main.cpp:(.text._ZN5boost15program_options11to_internalISsEESt6vectorISsSaISsEERKS2_IT_SaIS5_EE[_ZN5boost15program_options11to_internalISsEESt6vectorISsSaISsEERKS2_IT_SaIS5_EE]+0x46): undefined reference to `boost::program_options::to_internal(std::string const&)'
CMakeFiles/boost_test.dir/main.cpp.o:(.rodata._ZTVN5boost15program_options11typed_valueISscEE[_ZTVN5boost15program_options11typed_valueISscEE]+0x40): undefined reference to `boost::program_options::value_semantic_codecvt_helper<char>::parse(boost::any&, std::vector<std::string, std::allocator<std::string> > const&, bool) const'
CMakeFiles/boost_test.dir/main.cpp.o: In function `boost::program_options::typed_value<std::string, char>::name() const':
main.cpp:(.text._ZNK5boost15program_options11typed_valueISscE4nameEv[_ZNK5boost15program_options11typed_valueISscE4nameEv]+0x32): undefined reference to `boost::program_options::arg'
CMakeFiles/boost_test.dir/main.cpp.o: In function `boost::program_options::typed_value<std::string, char>::xparse(boost::any&, std::vector<std::string, std::allocator<std::string> > const&) const':
main.cpp:(.text._ZNK5boost15program_options11typed_valueISscE6xparseERNS_3anyERKSt6vectorISsSaISsEE[_ZNK5boost15program_options11typed_valueISscE6xparseERNS_3anyERKSt6vectorISsSaISsEE]+0x7a): undefined reference to `boost::program_options::validate(boost::any&, std::vector<std::string, std::allocator<std::string> > const&, std::string*, int)'
collect2: error: ld returned 1 exit status
make[2]: *** [boost_test] Error 1
make[2]: Leaving directory `/home/test/build'
make[1]: *** [CMakeFiles/boost_test.dir/all] Error 2
make[1]: Leaving directory `/home/test/build'
make: *** [all] Error 2
Thank you Amadeus, Someprogrammerdude and Tsyvarev for leading me in the right direction here :)
In fact, it was a compiler issue: The default compiler on the cluster was gcc-4.8.5, which cannot handle the latest Boost versions. Therefore, we loaded a module for gcc-5.4 but /usr/bin/gcc was still gcc-4.8.5. When we set the cxx compiler for cmake to gcc-5.4 the build process still failed, since we also use CUDA and per default the host code is not forwarded to the cxx compiler but the c compiler, which was still gcc-4.8.5. So after setting CUDA_HOST_COMPILER to CMAKE_CXX_COMPILER it works fine now.
I installed OpenCV3.0 using the source code obtained from itseez github repo. I set the install prefix as /home/ubuntu/installed_libs/. All went well. I even set ldconfig path in /etc/ld.so.conf.d/local.conf and then sudo ldconfig.
However in my project (CMake) I cannot find the newly installed directory.
When I do cmake ../ in the build directory it throws the following error.
I did some changes as suggested in the answers.
cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
set(OpenCV_DIR /home/ubuntu/installed_libs/share/OpenCV)
find_package( OpenCV )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBRARIES} )
message(STATUS "OpenCV_FOUND=${OpenCV_FOUND}")
message(STATUS "OpenCV_INCLUDES=${OpenCV_INCLUDE_DIR}")
message(STATUS "OpenCV_LIBRARIES=${OpenCV_LIBRARIES}")
message(STATUS "OpenCV_DEFINATIONS=${OpenCV_DEFINATIONS}")
message(STATUS "OpenCV_DIR=${OpenCV_DIR}")
Now cmake happens successfully.
$ cmake ..
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found CUDA: /usr/local/cuda (found suitable exact version "6.5")
-- OpenCV_FOUND=1
-- OpenCV_INCLUDES=
-- OpenCV_LIBRARIES=opencv_videostab;opencv_videoio;opencv_video;opencv_ts;opencv_superres;opencv_stitching;opencv_shape;opencv_photo;opencv_objdetect;opencv_ml;opencv_imgproc;opencv_imgcodecs;opencv_highgui;opencv_hal;opencv_flann;opencv_features2d;opencv_cudev;opencv_cudawarping;opencv_cudastereo;opencv_cudaoptflow;opencv_cudaobjdetect;opencv_cudalegacy;opencv_cudaimgproc;opencv_cudafilters;opencv_cudafeatures2d;opencv_cudacodec;opencv_cudabgsegm;opencv_cudaarithm;opencv_core;opencv_calib3d
-- OpenCV_DEFINATIONS=
-- OpenCV_DIR=/home/ubuntu/installed_libs/share/OpenCV
-- Configuring done
-- Generating done
-- Build files have been written to: /home/ubuntu/ctry/opencvtest/build
However, when I do a make, I get an error :
Scanning dependencies of target DisplayImage
[100%] Building CXX object CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o
Linking CXX executable DisplayImage
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `main':
DisplayImage.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'
DisplayImage.cpp:(.text+0x108): undefined reference to `cv::namedWindow(std::string const&, int)'
DisplayImage.cpp:(.text+0x14e): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
DisplayImage.cpp:(.text+0x15e): undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [DisplayImage] Error 1
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2
make: *** [all] Error 2
I know this is a linking error. How should I fix this?
Verbose make display incase it is helpful.
$ make VERBOSE=1
/usr/bin/cmake -H/home/ubuntu/ctry/opencvtest -B/home/ubuntu/ctry/opencvtest/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/ubuntu/ctry/opencvtest/build/CMakeFiles /home/ubuntu/ctry/opencvtest/build/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/ubuntu/ctry/opencvtest/build'
make -f CMakeFiles/DisplayImage.dir/build.make CMakeFiles/DisplayImage.dir/depend
make[2]: Entering directory `/home/ubuntu/ctry/opencvtest/build'
cd /home/ubuntu/ctry/opencvtest/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/ubuntu/ctry/opencvtest /home/ubuntu/ctry/opencvtest /home/ubuntu/ctry/opencvtest/build /home/ubuntu/ctry/opencvtest/build /home/ubuntu/ctry/opencvtest/build/CMakeFiles/DisplayImage.dir/DependInfo.cmake --color=
make[2]: Leaving directory `/home/ubuntu/ctry/opencvtest/build'
make -f CMakeFiles/DisplayImage.dir/build.make CMakeFiles/DisplayImage.dir/build
make[2]: Entering directory `/home/ubuntu/ctry/opencvtest/build'
Linking CXX executable DisplayImage
/usr/bin/cmake -E cmake_link_script CMakeFiles/DisplayImage.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o -o DisplayImage -L/usr/local/cuda/lib -rdynamic /home/ubuntu/installed_libs/lib/libopencv_videostab.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_videoio.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_video.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_ts.a /home/ubuntu/installed_libs/lib/libopencv_superres.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_stitching.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_shape.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_photo.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_objdetect.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_ml.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgproc.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgcodecs.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_highgui.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_hal.a /home/ubuntu/installed_libs/lib/libopencv_flann.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_features2d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudev.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudawarping.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudastereo.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaoptflow.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaobjdetect.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudalegacy.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaimgproc.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudafilters.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudafeatures2d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudacodec.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudabgsegm.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaarithm.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_core.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_calib3d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudawarping.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_objdetect.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudafilters.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudaarithm.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_features2d.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_ml.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_highgui.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_videoio.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgcodecs.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_flann.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_video.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_imgproc.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_core.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_cudev.so.3.0.0 /home/ubuntu/installed_libs/lib/libopencv_hal.a -ldl -lm -lpthread -lrt -lcudart -lnppc -lnppi -lnpps -lcufft -lcudart -lnppc -lnppi -lnpps -lcufft -Wl,-rpath,/usr/local/cuda/lib:/home/ubuntu/installed_libs/lib
CMakeFiles/DisplayImage.dir/DisplayImage.cpp.o: In function `main':
DisplayImage.cpp:(.text+0x94): undefined reference to `cv::imread(std::string const&, int)'
DisplayImage.cpp:(.text+0x108): undefined reference to `cv::namedWindow(std::string const&, int)'
DisplayImage.cpp:(.text+0x14e): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
DisplayImage.cpp:(.text+0x15e): undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [DisplayImage] Error 1
make[2]: Leaving directory `/home/ubuntu/ctry/opencvtest/build'
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2
make[1]: Leaving directory `/home/ubuntu/ctry/opencvtest/build'
make: *** [all] Error 2
You should check the output of:
ldconfig -p | grep -i opencv
pkg-config --cflags opencv
pkg-config --libs opencv
If nothing is listed, then you ldconfig may configured incorrectly. If the system-installed version of OpenCV is listed, it may be a problem of the search order.
In either case, you could try to configure the CMAKE_MODULE_PATH of your project DisplayImage, which is searched by CMake before standard system locations. So, assuming your in your build directory of DisplayImage is $SRC_DIR/build, configure your project like this
cmake -DCMAKE_MODULE_PATH="/home/ubuntu/installed_libs/<OpenCV directory>" <other options> ..
Also interesting: what happens in the background of find_package().
You can add
set(OpenCV_DIR /home/ubuntu/installed_libs/share/OpenCV)
to your CMakeLists, so it looks something like
cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
set(OpenCV_DIR /home/ubuntu/installed_libs/share/OpenCV)
find_package( OpenCV REQUIRED 3.0 )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )
So I tried to install clang + cmake to compile a simple C++ program and I'm getting the following error:
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is Clang 3.5.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/local/bin/clang++
-- Check for working CXX compiler: /usr/local/bin/clang++ -- broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:54 (message):
The C++ compiler "/usr/local/bin/clang++" is not able to compile a simple
test program.
It fails with the following output:
Change Dir: /home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp
Run Build Command:/usr/bin/gmake "cmTryCompileExec697180971/fast"
/usr/bin/gmake -f CMakeFiles/cmTryCompileExec697180971.dir/build.make
CMakeFiles/cmTryCompileExec697180971.dir/build
gmake[1]: Entering directory
`/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report
/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp/CMakeFiles 1
Building CXX object
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o
/usr/local/bin/clang++ -o
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o -c
/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTryCompileExec697180971
/usr/bin/cmake -E cmake_link_script
CMakeFiles/cmTryCompileExec697180971.dir/link.txt --verbose=1
/usr/local/bin/clang++
CMakeFiles/cmTryCompileExec697180971.dir/testCXXCompiler.cxx.o -o
cmTryCompileExec697180971 -rdynamic
/usr/bin/ld: cannot find -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
gmake[1]: Leaving directory
`/home/jtcwang/tmp/CMake/CMake/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTryCompileExec697180971] Error 1
gmake: *** [cmTryCompileExec697180971/fast] Error 2
It's not even compiling my program because it fails to compile a test program.
Looks like the important line is here:
/usr/bin/ld: cannot find -lstdc++
However, I have checked that libstdc++ is installed and up to date, so at this point I'm quite lost.
Other things I've tried:
Using prebuilt binaries instead of sudo yum install clang
remove and reinstall
Tried clang++ hello.cpp (hello world program). It says <iostreams> is not found. Is clang missing a standard library? EDIT: changing to <iostream> gives me the same linker error above.
I'm not familiar with the clang, cmake and C++ scene in general, so I'd appreciate any pointers. Thanks!
You need the development libraries and headers for C++ library, try
yum install libstdc++-devel
Your /home/gnu/bin/c++ seem to require additional flag to link things properly and CMake doesn't know about that.
To use /usr/bin/c++ as your compiler run cmake with -DCMAKE_CXX_COMPILER=/usr/bin/c++.
Also, CMAKE_PREFIX_PATH variable sets destination dir where your project' files should be installed. It has nothing to do with CMake installation prefix and CMake itself already know this.
I have the following CMakeLists.txt:
cmake_minimum_required (VERSION 2.6)
project (MTSOS)
# Select flags.
set(CMAKE_C_FLAGS "-std=c99")
# Blas library
find_package( BLAS REQUIRED )
include_directories(${BLAS_INCLUDE_DIR})
add_executable (test_MTSOS test_MTSOS.c barrier_front.c dynamics_front.c
MTSOS.c csparse.c)
# Linking CImg dependencies.
target_link_libraries (test_MTSOS m blas ${BLAS_LIBRARIES})
When I run cmake .. :
-- The C compiler identification is GNU 4.8.2
-- The CXX compiler identification is GNU 4.8.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Looking for dgemm_
-- Looking for dgemm_ - found
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
-- A library with BLAS API found.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jabuntu14/Desktop/MTSOS/build
However, when I try to compile with make:
Scanning dependencies of target test_MTSOS
[ 20%] Building C object CMakeFiles/test_MTSOS.dir/test_MTSOS.c.o
[ 40%] Building C object CMakeFiles/test_MTSOS.dir/barrier_front.c.o
/home/jabuntu14/Desktop/MTSOS/barrier_front.c: In function ‘so_barrier’:
/home/jabuntu14/Desktop/MTSOS/barrier_front.c:83:25: warning: implicit declaration of function ‘dsyr’ [-Wimplicit-function-declaration]
dsyr(uplo, &u_size, &alpha, &Df[i*U_size], &one, A, &u_size);
^
[ 60%] Building C object CMakeFiles/test_MTSOS.dir/dynamics_front.c.o
[ 80%] Building C object CMakeFiles/test_MTSOS.dir/MTSOS.c.o
/home/jabuntu14/Desktop/MTSOS/MTSOS.c: In function ‘so_MakeA’:
/home/jabuntu14/Desktop/MTSOS/MTSOS.c:1561:13: warning: implicit declaration of function ‘dgemv’ [-Wimplicit-function-declaration]
dgemv(chn, &m_m, &n_m, &one, &M_dynamics[i*State_size*State_size], &m_m, &S_prime[i*State_size], &p_m, &zero, datam, &p_m);
^
[100%] Building C object CMakeFiles/test_MTSOS.dir/csparse.c.o
Linking C executable test_MTSOS
CMakeFiles/test_MTSOS.dir/barrier_front.c.o: In function `so_barrier':
barrier_front.c:(.text+0x4a7): undefined reference to `dsyr'
CMakeFiles/test_MTSOS.dir/MTSOS.c.o: In function `so_MakeA':
MTSOS.c:(.text+0x5e41): undefined reference to `dgemv'
MTSOS.c:(.text+0x5ee4): undefined reference to `dgemv'
MTSOS.c:(.text+0x5f87): undefined reference to `dgemv'
collect2: error: ld returned 1 exit status
make[2]: *** [test_MTSOS] Error 1
make[1]: *** [CMakeFiles/test_MTSOS.dir/all] Error 2
make: *** [all] Error 2
So I am having a linking problem but I cannot figure out why. Any help is welcome. Thanks!!
NOTE: Working under Ubuntu 14.04 with GCC. In the .c files I have included #include "cblas.h" as I saw in other websites.
EDIT: running make VERBOSE=1 the output is:
jabuntu14#ubuntu:~/Desktop/MTSOS/build$ make VERBOSE=1
/usr/bin/cmake -H/home/jabuntu14/Desktop/MTSOS -B/home/jabuntu14/Desktop/MTSOS/build --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/jabuntu14/Desktop/MTSOS/build/CMakeFiles /home/jabuntu14/Desktop/MTSOS/build/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/jabuntu14/Desktop/MTSOS/build'
make -f CMakeFiles/test_MTSOS.dir/build.make CMakeFiles/test_MTSOS.dir/depend
make[2]: Entering directory `/home/jabuntu14/Desktop/MTSOS/build'
cd /home/jabuntu14/Desktop/MTSOS/build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/jabuntu14/Desktop/MTSOS /home/jabuntu14/Desktop/MTSOS /home/jabuntu14/Desktop/MTSOS/build /home/jabuntu14/Desktop/MTSOS/build /home/jabuntu14/Desktop/MTSOS/build/CMakeFiles/test_MTSOS.dir/DependInfo.cmake --color=
make[2]: Leaving directory `/home/jabuntu14/Desktop/MTSOS/build'
make -f CMakeFiles/test_MTSOS.dir/build.make CMakeFiles/test_MTSOS.dir/build
make[2]: Entering directory `/home/jabuntu14/Desktop/MTSOS/build'
Linking C executable test_MTSOS
/usr/bin/cmake -E cmake_link_script CMakeFiles/test_MTSOS.dir/link.txt --verbose=1
/usr/bin/cc -std=c99 CMakeFiles/test_MTSOS.dir/test_MTSOS.c.o CMakeFiles/test_MTSOS.dir/barrier_front.c.o CMakeFiles/test_MTSOS.dir/dynamics_front.c.o CMakeFiles/test_MTSOS.dir/MTSOS.c.o CMakeFiles/test_MTSOS.dir/csparse.c.o -o test_MTSOS -rdynamic -lm -lblas -lf77blas -latlas
CMakeFiles/test_MTSOS.dir/barrier_front.c.o: In function `so_barrier':
barrier_front.c:(.text+0x4a7): undefined reference to `dsyr'
CMakeFiles/test_MTSOS.dir/MTSOS.c.o: In function `so_MakeA':
MTSOS.c:(.text+0x5e41): undefined reference to `dgemv'
MTSOS.c:(.text+0x5ee4): undefined reference to `dgemv'
MTSOS.c:(.text+0x5f87): undefined reference to `dgemv'
collect2: error: ld returned 1 exit status
make[2]: *** [test_MTSOS] Error 1
make[2]: Leaving directory `/home/jabuntu14/Desktop/MTSOS/build'
make[1]: *** [CMakeFiles/test_MTSOS.dir/all] Error 2
make[1]: Leaving directory `/home/jabuntu14/Desktop/MTSOS/build'
make: *** [all] Error 2
The functions in standard blas libraries are
dgemv_
Instead of
dgemv
As shown in your error, notice the trailing underscore.
So you probably have something in your code calling dgemv() instead of dgemv_(), change that and then you should be fine.
(I had the same issue where the code I was using had some like #define dgemv_ dgemv)
I am using FANN (http://leenissen.dk/fann/wp/download/). Both headers are available in the archive that you can download there (I hope I don't create too much trouble for you).
/*
* File: main.cpp
* Author: johannsebastian
*
* Created on November 26, 2013, 8:50 PM
*/
#include "../FANN-2.2.0-Source/src/include/doublefann.h"
#include "../FANN-2.2.0-Source/src/include/fann_cpp.h"
#include <cstdlib>
#include <iostream>
using namespace std;
using namespace FANN;
/*
*
*/
//Remember: fann_type is double!
int main(int argc, char** argv) {
neural_net * N = new neural_net;
const unsigned int myLayerArray[4] = {1,2,2,1};
const unsigned int numLayers = 4;
N->create_standard(3,1,2,1);
cout<<"Easy!";
return 0;
}
g++ says
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory `/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet'
"/usr/bin/make" -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux-x86/bachnet
make[2]: Entering directory `/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet'
mkdir -p build/Debug/GNU-Linux-x86
rm -f "build/Debug/GNU-Linux-x86/main.o.d"
g++ -c -g -MMD -MP -MF "build/Debug/GNU-Linux-x86/main.o.d" -o build/Debug/GNU-Linux-x86/main.o main.cpp
mkdir -p dist/Debug/GNU-Linux-x86
g++ -o dist/Debug/GNU-Linux-x86/bachnet build/Debug/GNU-Linux-x86/main.o
build/Debug/GNU-Linux-x86/main.o: In function `FANN::neural_net::destroy()':
/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet/../FANN-2.2.0-Source/src/include/fann_cpp.h:915: undefined reference to `fann_get_user_data'
/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet/../FANN-2.2.0-Source/src/include/fann_cpp.h:919: undefined reference to `fann_destroy'
build/Debug/GNU-Linux-x86/main.o: In function `FANN::neural_net::create_standard_array(unsigned int, unsigned int const*)':
/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet/../FANN-2.2.0-Source/src/include/fann_cpp.h:979: undefined reference to `fann_create_standard_array'
collect2: error: ld returned 1 exit status
make[2]: *** [dist/Debug/GNU-Linux-x86/bachnet] Error 1
make[2]: Leaving directory `/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet'
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory `/home/johannsebastian/Desktop/heatmap3d/BACHnet/BACHnet'
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 773ms)
Can you help me fix this? I think I might have some basic compiler config wrong or something.
The compiler has compiled your code. The includes are really work. (But you don't have to specify full path there, just the name of the header, if the library is installed correctly).
This is the linker (ld) who can't find the method.
The linker problems about whether you have library with the method definition and give it to the linker (in its options) when you call it.
You use make file, so you have to specify options (something like -lFANN) and path to the library there (like -L/path/path/path. The path you also can specified in $LD_LIBRARY_PATH system variable, then you don't need -L option). Also you have to install (compile) the library itself before to use it. You have installation guide here.
The guide works for me:
Download the FANN-2.2.0-Source.
Install it with cmake:
[08:42:24]~/Downloads$ cd FANN-2.2.0-Source/
[08:42:27]~/Downloads/FANN-2.2.0-Source$ ls
CMakeLists.txt README.txt bin datasets src
COPYING.txt VS2010 cmake examples
[08:42:27]~/Downloads/FANN-2.2.0-Source$ cmake .
-- The C compiler identification is GNU 4.7.3
-- The CXX compiler identification is GNU 4.7.3
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - yes
-- Check for working C compiler: /opt/local/bin/gcc
-- Check for working C compiler: /opt/local/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Checking whether CXX compiler has -isysroot
-- Checking whether CXX compiler has -isysroot - yes
-- Checking whether CXX compiler supports OSX deployment target flag
-- Checking whether CXX compiler supports OSX deployment target flag - yes
-- Check for working CXX compiler: /<...>g++
-- Check for working CXX compiler: /<...>g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- FANN is used as APPLICATION_NAME
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/ikulakov/Downloads/FANN-2.2.0-Source
[08:43:57]~/Downloads/FANN-2.2.0-Source$ make
Scanning dependencies of target doublefann
[ 25%] Building C object src/CMakeFiles/doublefann.dir/doublefann.c.o
Linking C shared library libdoublefann.dylib
[ 25%] Built target doublefann
Scanning dependencies of target fann
[ 50%] Building C object src/CMakeFiles/fann.dir/floatfann.c.o
Linking C shared library libfann.dylib
[ 50%] Built target fann
Scanning dependencies of target fixedfann
[ 75%] Building C object src/CMakeFiles/fixedfann.dir/fixedfann.c.o
Linking C shared library libfixedfann.dylib
[ 75%] Built target fixedfann
Scanning dependencies of target floatfann
[100%] Building C object src/CMakeFiles/floatfann.dir/floatfann.c.o
Linking C shared library libfloatfann.dylib
[100%] Built target floatfann
[08:44:02]~/Downloads/FANN-2.2.0-Source$ sudo make install
In your case, not the Compiler, but the Linker fails to find the function.
The compiler is what you satisfy with including the files containing the declarations of the functions you use, and specifying the directory for the included files.
The linker wants to see the actual library containing the compiled definition of the code.
You probably have to specify -lfann on the linker command line (for the exact name to use after -l, refer to what the library is actually called - if it is called libfann.so, use above parameter).
In case the library is installed in the default directories, thish should be enough; otherwise you might also need the -L parameter pointing to the path containing the library (and the library would have to be compiled first, of course).