My code won't compile and I don't understand the cryptic output from the compiler. Can you spot the error?
main.cpp
#include <vector>
#include <string>
int main() {
std::vector <std::string> myVar;
return 0;
}
Then in bash:
$ gcc main.cpp
/tmp/ccvmVBRq.o: In function `__gnu_cxx::new_allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::deallocate(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*, unsigned long)':
main.cpp:(.text._ZN9__gnu_cxx13new_allocatorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEE10deallocateEPS6_m[_ZN9__gnu_cxx13new_allocatorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEE10deallocateEPS6_m]+0x1c): undefined reference to `operator delete(void*)'
/tmp/ccvmVBRq.o: In function `void std::_Destroy<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*)':
main.cpp:(.text._ZSt8_DestroyINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEvPT_[_ZSt8_DestroyINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEvPT_]+0x14): undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/tmp/ccvmVBRq.o:(.data.rel.local.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0): undefined reference to `__gxx_personality_v0'
collect2: error: ld returned 1 exit status
This is C++ code, so you have to compile it with g++. Try:
$ g++ main.cpp
Related
I have correctly installed crfsuite from source (https://github.com/downloads/chokkan/crfsuite/crfsuite-0.12.tar.gz).
But when I try to compile a very simple code, it seems that I have missed something.
Here is the code:
#include "crfsuite.hpp"
using namespace CRFSuite;
int main(int argc, char *argv[])
{
Tagger tagger;
}
Here's the command line to compile:
g++ -L/usr/local/lib -I/usr/local/include -lcrfsuite tagging.cpp
and the error:
/tmp/ccIkvCFv.o: In function `CRFSuite::Trainer::Trainer()':
tagging.cpp:(.text+0x48): undefined reference to `crfsuite_data_init'
/tmp/ccIkvCFv.o: In function `CRFSuite::Trainer::init()':
tagging.cpp:(.text+0x149): undefined reference to `crfsuite_create_instance'
tagging.cpp:(.text+0x1b7): undefined reference to `crfsuite_create_instance'
/tmp/ccIkvCFv.o: In function `CRFSuite::Trainer::clear()':
tagging.cpp:(.text+0x2dd): undefined reference to `crfsuite_data_finish'
tagging.cpp:(.text+0x2ed): undefined reference to `crfsuite_data_init'
/tmp/ccIkvCFv.o: In function `CRFSuite::Trainer::append(std::vector<std::vector<CRFSuite::Attribute, std::allocator<CRFSuite::Attribute> >, std::allocator<std::vector<CRFSuite::Attribute, std::allocator<CRFSuite::Attribute> > > > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, int)':
tagging.cpp:(.text+0x495): undefined reference to `crfsuite_instance_init_n'
tagging.cpp:(.text+0x51f): undefined reference to `crfsuite_item_init_n'
tagging.cpp:(.text+0x69b): undefined reference to `crfsuite_data_append'
tagging.cpp:(.text+0x6aa): undefined reference to `crfsuite_instance_finish'
/tmp/ccIkvCFv.o: In function `CRFSuite::Trainer::select(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
tagging.cpp:(.text+0x7e9): undefined reference to `crfsuite_create_instance'
/tmp/ccIkvCFv.o: In function `CRFSuite::Tagger::open(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
tagging.cpp:(.text+0x11a0): undefined reference to `crfsuite_create_instance_from_file'
/tmp/ccIkvCFv.o: In function `CRFSuite::Tagger::set(std::vector<std::vector<CRFSuite::Attribute, std::allocator<CRFSuite::Attribute> >, std::allocator<std::vector<CRFSuite::Attribute, std::allocator<CRFSuite::Attribute> > > > const&)':
tagging.cpp:(.text+0x16c6): undefined reference to `crfsuite_instance_init_n'
tagging.cpp:(.text+0x1731): undefined reference to `crfsuite_item_init'
tagging.cpp:(.text+0x17e1): undefined reference to `crfsuite_attribute_set'
tagging.cpp:(.text+0x17f4): undefined reference to `crfsuite_item_append_attribute'
tagging.cpp:(.text+0x1854): undefined reference to `crfsuite_instance_finish'
tagging.cpp:(.text+0x18ac): undefined reference to `crfsuite_instance_finish'
collect2: error: ld returned 1 exit status
The paths are correct (/usr/local/lib, /usr/local/include)
The order of arguments matters. The library should go after your cpp file:
g++ -L/usr/local/lib -I/usr/local/include tagging.cpp -lcrfsuite
See the answer Why does the order in which libraries are linked sometimes cause errors in GCC? for more information.
I complie my c++ program by input:
g++ main.cpp crypto/Sign.cpp -o main -lssl -lcrypto && ./main
Unfortunately, I got these output:
/tmp/ccEDu0Qv.o: In function `Sign::md_ctx_sign_init(SignatureScheme, evp_md_ctx_st*)':
Sign.cpp:(.text+0x1b): undefined reference to `EVP_MD_CTX_reset'
Sign.cpp:(.text+0x104): undefined reference to `EVP_sha3_224'
Sign.cpp:(.text+0x137): undefined reference to `EVP_sha3_256'
Sign.cpp:(.text+0x16a): undefined reference to `EVP_sha3_384'
Sign.cpp:(.text+0x196): undefined reference to `EVP_sha3_512'
/tmp/ccEDu0Qv.o: In function `Sign::md_ctx_veri_init(SignatureScheme, evp_md_ctx_st*)':
Sign.cpp:(.text+0x22f): undefined reference to `EVP_MD_CTX_reset'
Sign.cpp:(.text+0x318): undefined reference to `EVP_sha3_224'
Sign.cpp:(.text+0x34b): undefined reference to `EVP_sha3_256'
Sign.cpp:(.text+0x37e): undefined reference to `EVP_sha3_384'
Sign.cpp:(.text+0x3aa): undefined reference to `EVP_sha3_512'
/tmp/ccEDu0Qv.o: In function `Sign::sign_hash(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, evp_md_ctx_st*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)':
Sign.cpp:(.text+0x4a9): undefined reference to `EVP_MD_CTX_free'
Sign.cpp:(.text+0x53f): undefined reference to `EVP_MD_CTX_free'
/tmp/ccEDu0Qv.o: In function `Sign::get_public_key(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)':
Sign.cpp:(.text+0x697): undefined reference to `EVP_PKEY_get0_EC_KEY'
/tmp/ccEDu0Qv.o: In function `Sign::get_private_key(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)':
Sign.cpp:(.text+0x85b): undefined reference to `EVP_PKEY_get0_EC_KEY'
/tmp/ccEDu0Qv.o: In function `Sign::EC_sign(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, SignatureScheme)':
Sign.cpp:(.text+0xa4a): undefined reference to `EVP_MD_CTX_new'
/tmp/ccEDu0Qv.o: In function `Sign::EC_veri(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, SignatureScheme)':
Sign.cpp:(.text+0xc56): undefined reference to `EVP_MD_CTX_new'
collect2: error: ld returned 1 exit status
So, what's wrong happend? How can I fix this problem?
The openssl I use is:
#:~$ which -a openssl
/usr/local/bin/openssl
/usr/bin/openssl
#:~$ openssl version
OpenSSL 1.1.1-pre5 (beta) 17 Apr 2018
In crypto/Sign.h, it include:
#include <openssl/conf.h>
#include <openssl/ec.h> // for EC_GROUP_new_by_curve_name, EC_GROUP_free, EC_KEY_new, EC_KEY_set_group, EC_KEY_generate_key, EC_KEY_free
#include <openssl/ecdsa.h> // for ECDSA_do_sign, ECDSA_do_verify
#include <openssl/err.h>
#include <openssl/evp.h>
#include <iostream>
#include <string>
I have installed opencv recently . I am trying to do a bit if image processing using opencv and cuda. but I am getting an error like this
nvcc -o reference_hw1 reference_main.o student_func.o compare.o reference_calc.o -arch=sm_20 -Xcompiler -Wall -Xcompiler -Wextra -m64 -L /usr/lib
reference_main.o: In function `preProcess(uchar4**, unsigned char**, uchar4**, unsigned char**, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
reference_main.cpp:(.text+0xc4): undefined reference to `cv::imread(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
reference_main.cpp:(.text+0x1b7): undefined reference to `cv::_OutputArray::_OutputArray(cv::Mat&)'
reference_main.cpp:(.text+0x1cd): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
reference_main.cpp:(.text+0x1ea): undefined reference to `cv::cvtColor(cv::_InputArray const&, cv::_OutputArray const&, int, int)'
reference_main.o: In function `postProcess(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned char*)':
reference_main.cpp:(.text+0x45a): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
reference_main.cpp:(.text+0x4a2): undefined reference to `cv::imwrite(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
reference_main.o: In function `generateReferenceImage(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
reference_main.cpp:(.text+0x5b2): undefined reference to `cv::imread(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
reference_main.cpp:(.text+0x5d4): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
reference_main.cpp:(.text+0x5ee): undefined reference to `cv::imwrite(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
reference_main.o: In function `cv::Mat::~Mat()':
reference_main.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x39): undefined reference to `cv::fastFree(void*)'
reference_main.o: In function `cv::Mat::operator=(cv::Mat const&)':
reference_main.cpp:(.text._ZN2cv3MataSERKS0_[cv::Mat::operator=(cv::Mat const&)]+0x111): undefined reference to `cv::Mat::copySize(cv::Mat const&)'
reference_main.o: In function `cv::Mat::create(int, int, int)':
reference_main.cpp:(.text._ZN2cv3Mat6createEiii[cv::Mat::create(int, int, int)]+0x96): undefined reference to `cv::Mat::create(int, int const*, int)'
reference_main.o: In function `cv::Mat::release()':
reference_main.cpp:(.text._ZN2cv3Mat7releaseEv[cv::Mat::release()]+0x47): undefined reference to `cv::Mat::deallocate()'
compare.o: In function `compareImages(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, double, double)':
compare.cpp:(.text+0x4e): undefined reference to `cv::imread(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
compare.cpp:(.text+0x6c): undefined reference to `cv::imread(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
compare.cpp:(.text+0x8c): undefined reference to `cv::operator-(cv::Mat const&, cv::Mat const&)'
compare.cpp:(.text+0xa5): undefined reference to `cv::abs(cv::MatExpr const&)'
compare.cpp:(.text+0x15a): undefined reference to `cv::Mat::reshape(int, int) const'
compare.cpp:(.text+0x15f): undefined reference to `cv::noArray()'
compare.cpp:(.text+0x17b): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
compare.cpp:(.text+0x1a9): undefined reference to `cv::minMaxLoc(cv::_InputArray const&, double*, double*, cv::Point_<int>*, cv::Point_<int>*, cv::_InputArray const&)'
compare.cpp:(.text+0x20c): undefined reference to `cv::operator-(cv::Mat const&, cv::Scalar_<double> const&)'
compare.cpp:(.text+0x22d): undefined reference to `cv::operator*(cv::MatExpr const&, double)'
compare.cpp:(.text+0x2d2): undefined reference to `cv::Mat::reshape(int, int) const'
compare.cpp:(.text+0x33d): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
compare.cpp:(.text+0x375): undefined reference to `cv::imwrite(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
collect2: ld returned 1 exit status
make: *** [student] Error 1
I don't know why the error is like this. My Makefile is
NVCC= nvcc
###################################
# These are the default install #
# locations on most linux distros #
###################################
OPENCV_LIBPATH=/usr/lib
OPENCV_INCLUDEPATH=/usr/local/include
OPENCV_TROUBLE=
CUDA_INCLUDEPATH=/usr/local/cuda/include
NVCC_OPTS = -arch=sm_20 -Xcompiler -Wall -Xcompiler -Wextra -m64
GCC_OPTS = -Wall -Wextra -m64
student: reference_main.o student_func.o compare.o reference_calc.o Makefile
$(NVCC) -o reference_hw1 reference_main.o student_func.o compare.o reference_calc.o $(NVCC_OPTS) -L $(OPENCV_LIBPATH) $(OPENCV_TROUBLE)
reference_main.o: reference_main.cpp timer.h utils.h reference_calc.cpp compare.cpp reference_hw1.cpp
g++ -c reference_main.cpp $(GCC_OPTS) -I $(OPENCV_INCLUDEPATH) -I $(CUDA_INCLUDEPATH) $(OPENCV_LIBPATH) $(OPENCV_TROUBLE)
student_func.o: student_func.cu utils.h
nvcc -c student_func.cu $(NVCC_OPTS)
compare.o: compare.cpp compare.h
g++ -c compare.cpp -I $(CUDA_INCLUDEPATH) $(GCC_OPTS) -I $(OPENCV_INCLUDEPATH) $(OPENCV_LIBPATH) $(OPENCV_TROUBLE)
reference_calc.o: reference_calc.cpp reference_calc.h
g++ -c reference_calc.cpp -I $(CUDA_INCLUDEPATH) $(GCC_OPTS) -I $(OPENCV_INCLUDEPATH) $(OPENCV_LIBPATH) $(OPENCV_TROUBLE)
clean:
rm -f *.o *.png hw
In the directory of /usr/local/include
there are two folders opencv and opencv2 , so everything is fine according to the arrangements .
Now how to solve the problem ?
yesterday whole day got used in solution for this problem.
Please anybody help me.. Thanks in advance...
I tried all the methods.....
#include <iostream>
#include <stdlib.h>
using namespace std;
int main()
{
string a;
cin>>a;
float v=strtof(a.c_str(),NULL);
cout<<v;
}
The above code works in g++ compiler. But in gcc its reporting following error.
/tmp/ccz60ueB.o: In function `main':
test1.cpp:(.text+0x12): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()'
test1.cpp:(.text+0x21): undefined reference to `std::cin'
test1.cpp:(.text+0x26): undefined reference to `std::basic_istream<char, std::char_traits<char> >& std::operator>><char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
test1.cpp:(.text+0x32): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::c_str() const'
test1.cpp:(.text+0x55): undefined reference to `std::cout'
test1.cpp:(.text+0x5a): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(float)'
test1.cpp:(.text+0x66): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
test1.cpp:(.text+0x81): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'
/tmp/ccz60ueB.o: In function `__static_initialization_and_destruction_0(int, int)':
test1.cpp:(.text+0xac): undefined reference to `std::ios_base::Init::Init()'
test1.cpp:(.text+0xb1): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccz60ueB.o:(.eh_frame+0x13): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status
You have to use g++ (or any C++ compiler) so it links with the C++ version of the library std. You shouldn't try to compile C++ code with a C compiler.
The following example works just fine for g++.
std::string asd="12312332434";
float as;
istringstream a;
a.str(asd);
a>>as;
cout<<as;
The following example must work fine for gcc.
//#include <stdio.h>
//#include <stdlib.h>
char asd[10];
float i;
fgets ( asd, 10, stdin );
i = atoi (asd);
gcc detects the language based on the file extension, so it can compile C++. However, you need to tell it to link against libstdc++.
For example:
gcc -o test test.cc -lstdc++
However, I'm not sure why you would do this.
I have the following code which i m trying to compile:
#include <boost/filesystem/convenience.hpp>
#include <boost/foreach.hpp>
#include <boost/range.hpp>
#include <iostream>
int main(int, char**)
{
namespace bf = boost::filesystem;
BOOST_FOREACH(bf::path path,
boost::make_iterator_range(
bf::recursive_directory_iterator(bf::path("/home")),
bf::recursive_directory_iterator())) {
std::cout << path.string() << std::endl;
}
return 0;
}
My boost library is in /home/foo/include . and the include files are actually there.
when i run the following:
g++ -I/home/foo/include/ test.cc
I get the following error. how can i resolve this. what should i follow?
/tmp/ccvDmFNL.o(.text+0x502): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `boost::system::get_system_category()'
/tmp/ccvDmFNL.o(.text+0x51b): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `boost::system::get_generic_category()'
/tmp/ccvDmFNL.o(.text+0x534): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `boost::system::get_generic_category()'
/tmp/ccvDmFNL.o(.text+0x54d): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `boost::system::get_generic_category()'
/tmp/ccvDmFNL.o(.text+0x566): In function `__static_initialization_and_destruction_0(int, int)':
: undefined reference to `boost::system::get_system_category()'
/tmp/ccvDmFNL.o(.gnu.linkonce.t._ZN5boost10filesystem24basic_directory_iteratorINS0_10basic_pathISsNS0_11path_traitsEEEE6m_initERKS4_+0x2e): In function `boost::filesystem::basic_directory_iterator<boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >::m_init(boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> const&)':
: undefined reference to `boost::filesystem::detail::not_found_error()'
/tmp/ccvDmFNL.o(.gnu.linkonce.t._ZN5boost10filesystem24basic_directory_iteratorINS0_10basic_pathISsNS0_11path_traitsEEEE6m_initERKS4_+0xbe): In function `boost::filesystem::basic_directory_iterator<boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >::m_init(boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> const&)':
: undefined reference to `boost::filesystem::detail::dir_itr_first(void*&, void*&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, boost::filesystem::file_status&, boost::filesystem::file_status&)'
/tmp/ccvDmFNL.o(.gnu.linkonce.t._ZN5boost6system10error_codeC1Ev+0x14): In function `boost::system::error_code::error_code()':
: undefined reference to `boost::system::get_system_category()'
/tmp/ccvDmFNL.o(.gnu.linkonce.t._ZN5boost10filesystem24basic_directory_iteratorINS0_10basic_pathISsNS0_11path_traitsEEEE9incrementEv+0xde): In function `boost::filesystem::basic_directory_iterator<boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >::increment()':
: undefined reference to `boost::filesystem::detail::dir_itr_increment(void*&, void*&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, boost::filesystem::file_status&, boost::filesystem::file_status&)'
/tmp/ccvDmFNL.o(.gnu.linkonce.t._ZN5boost10filesystem6statusINS0_10basic_pathISsNS0_11path_traitsEEEEENS_9enable_ifINS0_13is_basic_pathIT_EENS0_11file_statusEE4typeERKS7_+0x34): In function `boost::enable_if<boost::filesystem::is_basic_path<boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >, boost::filesystem::file_status>::type boost::filesystem::status<boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >(boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> const&)':
: undefined reference to `boost::filesystem::detail::status_api(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, boost::system::error_code&)'
/tmp/ccvDmFNL.o(.gnu.linkonce.t._ZN5boost10filesystem6detail11dir_itr_impINS0_10basic_pathISsNS0_11path_traitsEEEED1Ev+0x1d): In function `boost::filesystem::detail::dir_itr_imp<boost::filesystem::basic_path<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::filesystem::path_traits> >::~dir_itr_imp()':
: undefined reference to `boost::filesystem::detail::dir_itr_close(void*&, void*&)'
collect2: ld returned 1 exit status
EDIT:
Now i tried:
g++ -I/home/foo/include/ test.cc -lboost_system -lboost_filesystem
and get the following error:
/usr/bin/ld: cannot find -lboost_system
collect2: ld returned 1 exit status
I have the libboost_system-gcc34-1_38.so within
/home/foo/lib
how can I point to that?
from gcc man page:
-Ldir Add directory dir to the list of directories to be searched for -l.
So, is it that you are missing -L/home/foo/lib to the command line?
Your code compiled properly on my linux machine (Ubuntu 10.04, boost-filesystem 1.40) with the following command:
g++ test.cpp -lboost_filesystem
or
g++ test.cpp -lboost_system -lboost_filesystem
It gave me compile errors with g++ test.cpp -lboost_system
You must tell the compiler/linker where your libraries are as well, if they are not in the default location. For this you must use the -L flag to the compiler:
g++ -I/home/y/include/ test.cc -L/home/foo/lib -lboost_system -lboost_filesystem
Add -lboost_system (-lboost_system-mt if you're going to be threading) and -lboost_filesystem (-lboost_filesystem-mt if you're going to be threading) to the cmdline, before any input files.
Your boost libraries appear to be decorated with the suffix gcc34-1_38. Are you using gcc 3.4? Is your boost library on the library path? If not you may need to add the the path to your boost libraries using the -L flag to g++ or you can add the path to the LD_LIBRARY_PATH environment variable. In any case, you can link to your boost libraries by using -lboost_system-gcc34-1_38 and -lboost_filesystem-gcc34-1_38.