Incorect work with libraries?

[Wiz97]

I installed the latest C::B with MinGW/GCC inluded on windows (windows server 2008)

I wanted to use Poco and Boost libraries. Firstly I tried to add Poco libs to my project.
I added Include,Lib dir, added preprocessor definitions.

When I compile simple program:

Code

#include "Poco/Net/NetworkInterface.h"
#include "Poco/Net/Socket.h"
#include <iostream>
#include <vector>
using Poco::Net::NetworkInterface;
using std::vector;
using std::cout;
using std::endl;
using Poco::Net::Socket;
int main()
{
  vector<Poco::Net::NetworkInterface> nil = Poco::Net::NetworkInterface::list(); 
}

I got:

Build log:

Code

E:/c++/Projects/CB1/CBTestMakefile/CppTest.cpp:16: undefined reference to `Poco::Net::NetworkInterface::list()'
obj\Debug\CppTest.o: In function `_ZN9__gnu_cxx13new_allocatorIN4Poco3Net16NetworkInterfaceEE10deallocateEPS3_j':
C:/Program Files/CodeBlocks/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/ext/new_allocator.h:(.text$_ZSt8_DestroyIN4Poco3Net16NetworkInterfaceEEvPT_[void std::_Destroy<Poco::Net::NetworkInterface>(Poco::Net::NetworkInterface*)]+0xd): undefined reference to `Poco::Net::NetworkInterface::~NetworkInterface()'
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 30 seconds)
2 errors, 0 warnings

Build messages:

Code

obj\Debug\CppTest.o||In function `main':|
E:\c++\Projects\CB1\CBTestMakefile\CppTest.cpp|16|undefined reference to `Poco::Net::NetworkInterface::list()'|
obj\Debug\CppTest.o||In function `_ZN9__gnu_cxx13new_allocatorIN4Poco3Net16NetworkInterfaceEE10deallocateEPS3_j':|
)]+0xd)||undefined reference to `Poco::Net::NetworkInterface::~NetworkInterface()'|
||=== Build finished: 2 errors, 0 warnings ===|

Then I wanted to try any other library, like Boost
I folowed steps on http://wiki.codeblocks.org/index.php?title=BoostWindowsQuickRef

Then I tried to compile such program:

Code

#include <boost/regex.hpp>
#include <iostream>
#include <string>
int main()
{
    std::string line;
    boost::regex pat( "^Subject: (Re: |Aw: )*(.*)" );
    while (std::cin)
    {
        std::getline(std::cin, line);
        boost::smatch matches;
        if (boost::regex_match(line, matches, pat))
            std::cout << matches[2] << std::endl;
    }
}

And got

Build messages:

Code

obj\Debug\CppTest.o||In function `_ZN9__gnu_cxxmiIPKcS2_SsEENS_17__normal_iteratorIT_T1_E15difference_typeERKS6_RKNS3_IT0_S5_EE':|
 boost::regex_constants::_match_flags)]+0x9a)||undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()'|
 unsigned int)]+0x22)||undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)'|
obj\Debug\CppTest.o||In function `main':|
E:\c++\Projects\CB1\CBTestMakefile\CppTest.cpp|6|undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)'|
||=== Build finished: 3 errors, 0 warnings ===|

Looks like "uderfined reference" error caused because headers are found, but libraries object code doesn't include the realisation. And it is the same with Poco and Boost library sets....

What is the reason of such errors and how to fix it?

[jfouche]

You have to build those libs, and then add them to the linker :

Code

project -> Build options 
-> linker : Add the libs
-> Search directory -> Linker : Add the libs path

I don't know POCO, but for boost, you will need to add boost-regexp-mingw-3.4.5.lib (for me)

I suggest you also to create environment variable for those tools :
Settings -> Global variables :
Add new variable named "boost"

Code

Base : C:\projets\cpp\boost_1_36_0 (for me)
Include : C:\projets\cpp\boost_1_36_0
lib : C:\projets\cpp\boost_1_36_0\bin.v2\libs

and put $(boost.include) in search directory -> compiler
and $(boost.lib) in search directory -> linker

Use bjam to build boost
HTH
--
Jérémie

[Wiz97]

Of course libraries are already built,
Search Directories for Compiler, Linker are set and on Linker settings tab "Link libraries" contains required by headers libs.

I have such kind of errors with everything set up.

My C::B project file:

Code

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<CodeBlocks_project_file>
	<FileVersion major="1" minor="6" />
	<Project>
		<Option title="CodeBlocksTest" />
		<Option pch_mode="2" />
		<Option compiler="gcc" />
		<Build>
			<Target title="Debug">
				<Option output="bin\Debug\CodeBlocksTest" prefix_auto="1" extension_auto="1" />
				<Option object_output="obj\Debug\" />
				<Option type="1" />
				<Option compiler="gcc" />
				<Compiler>
					<Add option="-g" />
					<Add directory="$(#boost.include)" />
				</Compiler>
				<Linker>
					<Add library="..\..\boost_1_36_0\lib\boost_regex-vc90-mt-1_36.lib" />
					<Add directory="$(#boost.lib)" />
				</Linker>
			</Target>
			<Target title="Release">
				<Option output="bin\Release\CodeBlocksTest" prefix_auto="1" extension_auto="1" />
				<Option object_output="obj\Release\" />
				<Option type="1" />
				<Option compiler="gcc" />
				<Compiler>
					<Add option="-O2" />
				</Compiler>
				<Linker>
					<Add option="-s" />
				</Linker>
			</Target>
		</Build>
		<Compiler>
			<Add option="-Wall" />
			<Add option="-fexceptions" />
		</Compiler>
		<Unit filename="main.cpp" />
		<Extensions>
			<code_completion />
			<envvars />
			<debugger />
			<lib_finder disable_auto="1" />
		</Extensions>
	</Project>
</CodeBlocks_project_file>

Now I changed a bit project (Poco paths added)

Thats a program I try to build:

Code

#include <boost/regex.hpp>
#include <iostream>
#include <string>
#include <vector>
#include "Poco/Net/NetworkInterface.h"

using Poco::Net::NetworkInterface;
using std::cout;
using std::vector;
using std::endl;

int main()
{

    std::string line;
    boost::regex pat( "^Subject: (Re: |Aw: )*(.*)" );

    while (std::cin)
    {
        std::getline(std::cin, line);
        boost::smatch matches;
        if (boost::regex_match(line, matches, pat))
            std::cout << matches[2] << std::endl;
    }


    vector<NetworkInterface> nil = NetworkInterface::list();
  for (NetworkInterface::NetworkInterfaceList::iterator iter = nil.begin();
                                                        iter != nil.end(); ++iter)
   {
    NetworkInterface ni = *iter;
    cout << "Network interface: " << ni.name() << endl
         << " Submenet mask:" << ni.subnetMask().toString() << endl
         << " Broadcast: " << ni.broadcastAddress().toString() << endl
         << " Address: " << ni.address().toString() << endl
         << endl;
   }


}

Thats full command line info (all params suplied to compiler - paths too, are here):

Code

-------------- Build: Debug in CodeBlocksTest ---------------

[ 50.0%] mingw32-g++.exe -Wall -fexceptions -DPOCO_STATIC  -g    -IC:\boost_1_36_0\include\boost-1_36 -IC:\poco\svn\Foundation\include -IC:\poco\svn\Net\include  -c C:\Projects\CodeBlocksTest\main.cpp -o obj\Debug\main.o
[100.0%] mingw32-g++.exe -LC:\boost_1_36_0\lib -LC:\poco\svn\lib  -o bin\Debug\CodeBlocksTest.exe obj\Debug\main.o    C:\boost_1_36_0\lib\boost_regex-vc90-mt-1_36.lib C:\poco\svn\lib\PocoFoundationmtd.lib C:\poco\svn\lib\PocoNetmtd.lib 
obj\Debug\main.o: In function `main':
C:/Projects/CodeBlocksTest/main.cpp:27: undefined reference to `Poco::Net::NetworkInterface::list()'
C:/Projects/CodeBlocksTest/main.cpp:31: undefined reference to `Poco::Net::NetworkInterface::NetworkInterface(Poco::Net::NetworkInterface const&)'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::NetworkInterface::address() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::IPAddress::toString() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::NetworkInterface::broadcastAddress() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::IPAddress::toString() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::NetworkInterface::subnetMask() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::IPAddress::toString() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::NetworkInterface::name() const'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::NetworkInterface::~NetworkInterface()'
C:/Projects/CodeBlocksTest/main.cpp:32: undefined reference to `Poco::Net::NetworkInterface::~NetworkInterface()'
obj\Debug\main.o: In function `ZN9__gnu_cxxmiIPKcS2_SsEENS_17__normal_iteratorIT_T1_E15difference_typeERKS6_RKNS3_IT0_S5_EE':
C:/boost_1_36_0/include/boost-1_36/boost/regex/v4/basic_regex.hpp:(.text$_ZN5boost11regex_matchIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS5_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SD_RNS_13match_resultsISD_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE[bool boost::regex_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)]+0x9a): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()'
C:/boost_1_36_0/include/boost-1_36/boost/regex/v4/basic_regex.hpp:(.text$_ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)]+0x22): undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)'
obj\Debug\main.o: In function `main':
C:/Projects/CodeBlocksTest/main.cpp:13: undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::string>, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::string> > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)'
obj\Debug\main.o: In function `ZN9__gnu_cxxmiIPKcS2_SsEENS_17__normal_iteratorIT_T1_E15difference_typeERKS6_RKNS3_IT0_S5_EE':
C:/boost_1_36_0/include/boost-1_36/boost/regex/v4/basic_regex.hpp:(.text$_ZSt8_DestroyIN4Poco3Net16NetworkInterfaceEEvPT_[void std::_Destroy<Poco::Net::NetworkInterface>(Poco::Net::NetworkInterface*)]+0xd): undefined reference to `Poco::Net::NetworkInterface::~NetworkInterface()'
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 3 seconds)
15 errors, 0 warnings

[TDragon]

Code

[100.0%] mingw32-g++.exe <...> C:\boost_1_36_0\lib\boost_regex-vc90-mt-1_36.lib <...>

This is wrong. You're using MinGW; you need to link with the MinGW version of a library, not the Visual C++ version.

[MortenMacFly]

This is wrong. You're using MinGW; you need to link with the MinGW version of a library, not the Visual C++ version.

Just for the record: If you compile boost in this version with MinGW/GCC it will create *.lib files (*not* *.a files). So (s)he might in fact be using the MinGW/GCC variant correctly. This already lead to confusion in another thread in our forum. Maybe a search will help...?!

BTW: I just renamed the files to *.a in my copy.

[jfouche]

Just for the record: If you compile boost in this version with MinGW/GCC it will create *.lib files (*not* *.a files). So (s)he might in fact be using the MinGW/GCC variant correctly. This already lead to confusion in another thread in our forum. Maybe a search will help...?!

BTW: I just renamed the files to *.a in my copy.

There is a better way : In Linker settings => Link libraries : boost_regexp-mingw34-1_36 (without .lib, in the mingw FAQ, if I remember).
--
Jérémie

[TDragon]

Just for the record: If you compile boost in this version with MinGW/GCC it will create *.lib files (*not* *.a files). So (s)he might in fact be using the MinGW/GCC variant correctly.

Look at the file name. boost_regex-vc90-mt-1_36.lib is for Visual C++ 9.0. For MinGW, it should be boost_regex-gcc34-mt-1_36.lib. (Depending on the GCC version.)

[MortenMacFly]

Look at the file name. boost_regex-vc90-mt-1_36.lib is for Visual C++ 9.0. For MinGW, it should be boost_regex-gcc34-mt-1_36.lib. (Depending on the GCC version.)

Ooops - you are correct. My fault. :oops: