g++ linker can not find library - c++

I want to use this library in my c++/test.cpp file.
#include "omp/HandEvaluator.h"
#include <iostream>
using namespace omp;
int main()
{
HandEvaluator eval;
Hand h = Hand::empty(); // Final hand must include empty() exactly once!
h += Hand(51) + Hand(48) + Hand(0) + Hand(1) + Hand(2); // AdAs2s2h2c
std::cout << eval.evaluate(h) << std::endl; // 28684 = 7 * 4096 + 12
}
I downloaded the source code from github and placed into the OMPEval folder. After make the ompeval.a library appeared.
Here is the folder structure:
Now I try to build it:
projects/c++$ g++ -Wall -g -L /home/a/projects/c++/OMPEval/lib/ -l ompeval -I /home/a/projects/c++/OMPEval/ test.cpp -v
but the linker has error:
/usr/bin/ld: cannot find -lompeval
collect2: error: ld returned 1 exit status
Here is the whole build log:

Related

linking problem with dlfcn DLFCN-WIN32 library

I am currently trying to use the DLFCN-WIN32 library in order to use a c++ script originally implemented to use the dlfcn.h library.
When compiling the code (cantera V2.3), everything goes well except when generating the shared library where the dlopen and dlclose functions are not found.
originally script is :
/**
* #file CustomKinetics.cpp
*
* #ingroup chemkinetics
*/
//
// Author: Q. Cazeres, A. Felden, P. Pepiot
//
//
#include "cantera/kinetics/CustomKinetics.h"
#include <iostream>
#include <dlfcn.h>
using namespace std;
namespace Cantera
{
CustomKinetics::CustomKinetics(thermo_t* th) : GasKinetics(th)
{
printf("WARNING: Using customized kinetics from f90 file.\n");
handle = dlopen("customkinetics.so", RTLD_LAZY);
// load symbol
ck = (ck_t) dlsym(handle, "customkinetics_");
}
void CustomKinetics::get_wdot_reduced(doublereal* wdot)
{
doublereal P = thermo().pressure();
doublereal T = thermo().temperature();
// New yarc2 format
//doublereal rho = thermo().density();
const doublereal* m_y = thermo().massFractions();
ck(&P,&T,&m_y[0],&wdot[0]);
// New yarc2 format
//ck(&P,&T,&rho,&m_y[0],&wdot[0]);
// Old yarc format
//mol/kmol conversion cantera is in kmol
for (size_t i=0;i<thermo().nSpecies();i++) {
wdot[i]=wdot[i]/1000.0;
}
}
The script is compiled with the following command line :
g++ -o build\src\kinetics\CustomKinetics.o -c -std=c++0x -lpsapi -O3 -Wno-inline -g -Wall -include src/pch/system.h -DNDEBUG -Iinclude -Iinclude\cantera\ext -Ibuild\src -Ibuild\src\L -Isrc\L -IL:\LIB_WINDOWS\DLFCN-WIN32\include -IL:\LIB_WINDOWS\BOOST\boost_1_78_0 src\kinetics\CustomKinetics.cpp
The shared library is compiled with the following command line :
scons: warning: Using $CXX to link Fortran and C++ code together.
This may generate a buggy executable if the 'g++'
compiler does not know how to deal with Fortran runtimes.
g++ -static-libgcc -static-libstdc++ -shared -o build\lib\cantera_shared.dll build\ext\libexecstream\exec-stream.o build\ext\fmt\fmt\format.o build\ext\fmt\fmt\ostream.o build\ext\fmt\fmt\posix.o build\ext\sundials\src\sundials\sundials_band.o build\ext\sundials\src\sundials\sundials_dense.o build\ext\sundials\src\sundials\sundials_direct.o build\ext\sundials\src\sundials\sundials_iterative.o build\ext\sundials\src\sundials\sundials_math.o build\ext\sundials\src\sundials\sundials_nvector.o build\ext\sundials\src\sundials\sundials_pcg.o build\ext\sundials\src\sundials\sundials_sparse.o build\ext\sundials\src\sundials\sundials_spbcgs.o build\ext\sundials\src\sundials\sundials_spfgmr.o build\ext\sundials\src\sundials\sundials_spgmr.o build\ext\sundials\src\sundials\sundials_sptfqmr.o build\ext\sundials\src\nvec_ser\fnvector_serial.o build\ext\sundials\src\nvec_ser\nvector_serial.o build\ext\sundials\src\cvodes\cvodea.o build\ext\sundials\src\cvodes\cvodea_io.o build\ext\sundials\src\cvodes\cvodes.o build\ext\sundials\src\cvodes\cvodes_band.o build\ext\sundials\src\cvodes\cvodes_bandpre.o build\ext\sundials\src\cvodes\cvodes_bbdpre.o build\ext\sundials\src\cvodes\cvodes_dense.o build\ext\sundials\src\cvodes\cvodes_diag.o build\ext\sundials\src\cvodes\cvodes_direct.o build\ext\sundials\src\cvodes\cvodes_io.o build\ext\sundials\src\cvodes\cvodes_sparse.o build\ext\sundials\src\cvodes\cvodes_spbcgs.o build\ext\sundials\src\cvodes\cvodes_spgmr.o build\ext\sundials\src\cvodes\cvodes_spils.o build\ext\sundials\src\cvodes\cvodes_sptfqmr.o build\ext\sundials\src\ida\ida.o build\ext\sundials\src\ida\ida_band.o build\ext\sundials\src\ida\ida_bbdpre.o build\ext\sundials\src\ida\ida_dense.o build\ext\sundials\src\ida\ida_direct.o build\ext\sundials\src\ida\ida_ic.o build\ext\sundials\src\ida\ida_io.o build\ext\sundials\src\ida\ida_sparse.o build\ext\sundials\src\ida\ida_spbcgs.o build\ext\sundials\src\ida\ida_spgmr.o build\ext\sundials\src\ida\ida_spils.o build\ext\sundials\src\ida\ida_sptfqmr.o build\src\base\Parser.o build\src\base\ValueCache.o build\src\base\application.o build\src\base\checkFinite.o build\src\base\clockWC.o build\src\base\ct2ctml.o build\src\base\ctexceptions.o build\src\base\ctml.o build\src\base\global.o build\src\base\plots.o build\src\base\stringUtils.o build\src\base\xml.o build\src\thermo\ConstCpPoly.o build\src\thermo\ConstDensityThermo.o build\src\thermo\DebyeHuckel.o build\src\thermo\Elements.o build\src\thermo\FixedChemPotSSTP.o build\src\thermo\GibbsExcessVPSSTP.o build\src\thermo\HMWSoln.o build\src\thermo\HMWSoln_input.o build\src\thermo\IdealGasPhase.o build\src\thermo\IdealMolalSoln.o build\src\thermo\IdealSolidSolnPhase.o build\src\thermo\IdealSolnGasVPSS.o build\src\thermo\IonsFromNeutralVPSSTP.o build\src\thermo\LatticePhase.o build\src\thermo\LatticeSolidPhase.o build\src\thermo\MargulesVPSSTP.o build\src\thermo\MaskellSolidSolnPhase.o build\src\thermo\MetalSHEelectrons.o build\src\thermo\MineralEQ3.o build\src\thermo\MixedSolventElectrolyte.o build\src\thermo\MixtureFugacityTP.o build\src\thermo\MolalityVPSSTP.o build\src\thermo\MolarityIonicVPSSTP.o build\src\thermo\Mu0Poly.o build\src\thermo\MultiSpeciesThermo.o build\src\thermo\Nasa9Poly1.o build\src\thermo\Nasa9PolyMultiTempRegion.o build\src\thermo\NasaPoly2.o build\src\thermo\PDSS.o build\src\thermo\PDSS_ConstVol.o build\src\thermo\PDSS_HKFT.o build\src\thermo\PDSS_IdealGas.o build\src\thermo\PDSS_IonsFromNeutral.o build\src\thermo\PDSS_SSVol.o build\src\thermo\PDSS_Water.o build\src\thermo\Phase.o build\src\thermo\PhaseCombo_Interaction.o build\src\thermo\PureFluidPhase.o build\src\thermo\RedlichKisterVPSSTP.o build\src\thermo\RedlichKwongMFTP.o build\src\thermo\SemiconductorPhase.o build\src\thermo\SingleSpeciesTP.o build\src\thermo\Species.o build\src\thermo\SpeciesThermoFactory.o build\src\thermo\SpeciesThermoInterpType.o build\src\thermo\StoichSubstance.o build\src\thermo\SurfPhase.o build\src\thermo\ThermoFactory.o build\src\thermo\ThermoPhase.o build\src\thermo\VPSSMgr.o build\src\thermo\VPSSMgrFactory.o build\src\thermo\VPSSMgr_ConstVol.o build\src\thermo\VPSSMgr_General.o build\src\thermo\VPSSMgr_IdealGas.o build\src\thermo\VPSSMgr_Water_ConstVol.o build\src\thermo\VPSSMgr_Water_HKFT.o build\src\thermo\VPStandardStateTP.o build\src\thermo\WaterProps.o build\src\thermo\WaterPropsIAPWS.o build\src\thermo\WaterPropsIAPWSphi.o build\src\thermo\WaterSSTP.o build\src\tpx\CarbonDioxide.o build\src\tpx\HFC134a.o build\src\tpx\Heptane.o build\src\tpx\Hydrogen.o build\src\tpx\Methane.o build\src\tpx\Nitrogen.o build\src\tpx\Oxygen.o build\src\tpx\RedlichKwong.o build\src\tpx\Sub.o build\src\tpx\Water.o build\src\tpx\lk.o build\src\tpx\utils.o build\src\equil\BasisOptimize.o build\src\equil\ChemEquil.o build\src\equil\MultiPhase.o build\src\equil\MultiPhaseEquil.o build\src\equil\vcs_Gibbs.o build\src\equil\vcs_MultiPhaseEquil.o build\src\equil\vcs_SpeciesProperties.o build\src\equil\vcs_TP.o build\src\equil\vcs_VolPhase.o build\src\equil\vcs_elem.o build\src\equil\vcs_elem_rearrange.o build\src\equil\vcs_inest.o build\src\equil\vcs_nondim.o build\src\equil\vcs_phaseStability.o build\src\equil\vcs_prep.o build\src\equil\vcs_prob.o build\src\equil\vcs_rearrange.o build\src\equil\vcs_report.o build\src\equil\vcs_rxnadj.o build\src\equil\vcs_setMolesLinProg.o build\src\equil\vcs_solve.o build\src\equil\vcs_solve_TP.o build\src\equil\vcs_solve_phaseStability.o build\src\equil\vcs_species_thermo.o build\src\equil\vcs_util.o build\src\numerics\BandMatrix.o build\src\numerics\CVodesIntegrator.o build\src\numerics\DAE_solvers.o build\src\numerics\DenseMatrix.o build\src\numerics\Func1.o build\src\numerics\FuncEval.o build\src\numerics\IDA_Solver.o build\src\numerics\ODE_integrators.o build\src\numerics\ResidJacEval.o build\src\numerics\RootFind.o build\src\numerics\SquareMatrix.o build\src\numerics\funcs.o build\src\numerics\polyfit.o build\src\kinetics\AqueousKinetics.o build\src\kinetics\BulkKinetics.o build\src\kinetics\C12H26_25_373_27_TJKinetics.o build\src\kinetics\C12H26_NOX_27_452_20_TJKinetics.o build\src\kinetics\C2H4_18_320_11_AFKinetics.o build\src\kinetics\C3H8_22_173_12_FCKinetics.o build\src\kinetics\C7H16_25_210_27_FCKinetics.o build\src\kinetics\CH4_22_320_18_TJKinetics.o build\src\kinetics\CustomKinetics.o build\src\kinetics\Falloff.o build\src\kinetics\FalloffFactory.o build\src\kinetics\GasKinetics.o build\src\kinetics\Group.o build\src\kinetics\HYCHEM_27_272_12_AFKinetics.o build\src\kinetics\HYCHEM_NOX_29_548_17_AFKinetics.o build\src\kinetics\ImplicitSurfChem.o build\src\kinetics\InterfaceKinetics.o build\src\kinetics\Kinetics.o build\src\kinetics\KineticsFactory.o build\src\kinetics\Reaction.o build\src\kinetics\ReactionPath.o build\src\kinetics\RxnRates.o build\src\kinetics\importKinetics.o build\src\kinetics\solveSP.o build\src\kinetics\c12h262537327tj.o build\src\kinetics\c12h262745220tj.o build\src\kinetics\c2h41832011af.o build\src\kinetics\c3h82217312fc.o build\src\kinetics\c7h162521027fc.o build\src\kinetics\ch42232018tj.o build\src\kinetics\hychem2727212af.o build\src\kinetics\hychemnox2954817af.o build\src\kinetics\sankaran13.o build\src\transport\AVBPTransport.o build\src\transport\DustyGasTransport.o build\src\transport\GasTransport.o build\src\transport\HighPressureGasTransport.o build\src\transport\LTPspecies.o build\src\transport\LiquidTranInteraction.o build\src\transport\LiquidTransport.o build\src\transport\LiquidTransportData.o build\src\transport\LiquidTransportParams.o build\src\transport\MMCollisionInt.o build\src\transport\MixTransport.o build\src\transport\MultiTransport.o build\src\transport\SimpleTransport.o build\src\transport\SolidTransport.o build\src\transport\SolidTransportData.o build\src\transport\TransportBase.o build\src\transport\TransportData.o build\src\transport\TransportFactory.o build\src\transport\TransportParams.o build\src\transport\WaterTransport.o build\src\oneD\Domain1D.o build\src\oneD\MultiJac.o build\src\oneD\MultiNewton.o build\src\oneD\OneDim.o build\src\oneD\Sim1D.o build\src\oneD\StFlow.o build\src\oneD\boundaries1D.o build\src\oneD\refine.o build\src\zeroD\ConstPressureReactor.o build\src\zeroD\FlowDevice.o build\src\zeroD\FlowReactor.o build\src\zeroD\IdealGasConstPressureReactor.o build\src\zeroD\IdealGasReactor.o build\src\zeroD\Reactor.o build\src\zeroD\ReactorBase.o build\src\zeroD\ReactorFactory.o build\src\zeroD\ReactorNet.o build\src\zeroD\ReactorSurface.o build\src\zeroD\Wall.o build\src\clib\ct.o build\src\clib\ctfunc.o build\src\clib\ctmultiphase.o build\src\clib\ctonedim.o build\src\clib\ctreactor.o build\src\clib\ctrpath.o build\src\clib\ctsurf.o build\src\clib\ctxml.o -Lbuild\lib -Lbuild\src\L -Lsrc\L -LL:\LIB_WINDOWS\DLFCN-WIN32\lib -Wl,--out-implib,build\lib\libcantera_shared.a -Wl,--output-def,build\lib\cantera_shared.def
And after that I got the following error message :
=====
b"build\\src\\kinetics\\CustomKinetics.o: In function `Cantera::CustomKinetics::CustomKinetics(Cantera::ThermoPhase*)':\r\nL:\\LIB_WINDOWS\\CANTERA\\cantera-avbp-2.3/src/kinetics/CustomKinetics.cpp:23: undefined reference to `dlopen'\r\nL:\\LIB_WINDOWS\\CANTERA\\cantera-avbp-2.3/src/kinetics/CustomKinetics.cpp:26: undefined reference to `dlsym'\r\nbuild\\src\\kinetics\\CustomKinetics.o: In function `Cantera::CustomKinetics::close_dl()':\r\nL:\\LIB_WINDOWS\\CANTERA\\cantera-avbp-2.3/src/kinetics/CustomKinetics.cpp:53: undefined reference to `dlclose'\r\nL:\\LIB_WINDOWS\\CANTERA\\cantera-avbp-2.3/src/kinetics/CustomKinetics.cpp:53: undefined reference to `dlclose'\r\ncollect2.exe: error: ld returned 1 exit status\r\n"
=====
scons: *** [build\lib\cantera_shared.dll] Error 1
scons: building terminated because of errors.
The include and lib directories of the DLFCN-WIN32 libraries are well put in argument with -L option. Did I forget a compilation option?
Thank you in advance for your help,
Rock

Cannot find symbol in linked library

I'm trying to create go app, which uses some C++ code from sdk in shared library.
Added reference to target library with #cgo LDFLAGS:
#cgo LDFLAGS: -L/opt/cprocsp/lib/amd64 -lxades -v
and build go app with
go build -o main .
Compilation goes ok, but linking fails with error
/usr/bin/ld: $WORK/b001/_x003.o: undefined reference to symbol 'CryptReleaseContext'
/usr/bin/ld: //opt/cprocsp/lib/amd64/libcapi10.so.4: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Function CryptReleaseContext exists in /opt/cprocsp/lib/amd64/libxades.so.
With -v option I noticed linker arguments order
/usr/lib/gcc/x86_64-linux-gnu/8/collect2 ... $WORK/b001/_cgo_main.o $WORK/b001/_x001.o $WORK/b001/_x002.o $WORK/b001/_x003.o -lxades -lstdc++ ...
With Google I found that arguments order may be important, but I can't find a way to control them and stucking with it. How can I build app?
Example:
main.go
package main
import "log"
func main() {
data := "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<Envelope xmlns=\"urn:envelope\">" +
"<Data>Hello, World!</Data>" +
"<Node xml:id=\"nodeID\">Hello, Node!</Node>" +
"</Envelope>"
signed := Sign(data)
log.Print(signed)
}
signer.go
package main
/*
#cgo LDFLAGS: -L/opt/cprocsp/lib/amd64 -lxades -v
#include <stdarg.h>
#include <stdlib.h>
#include "signer.h"
*/
import "C"
import "log"
import "unsafe"
func Sign(data string) (result string) {
log.Print("Signing message")
c_data := C.CString(data)
defer C.free(unsafe.Pointer(c_data))
c_result := C.CString(result)
defer C.free(unsafe.Pointer(c_result))
C.sign(c_data, c_result)
return C.GoString(c_result)
}
signer.h
void sign(char* src, char *dst);
signer.cpp
SDK's example code, that uses functions from /opt/cprocsp/lib/amd64/libxades.so
...
extern "C" {
void sign(char* src, char *dst){
BYTE *pbToBeSigned = (BYTE *) src;
DWORD cbToBeSigned = strlen(src);
static XADES_SIGN_MESSAGE_PARA signParams = { sizeof(signParams) };
initSignParams(&signParams);
PCRYPT_DATA_BLOB pSignedMessage = 0;
// Создаем подписанное сообщение
if (!XadesSign(&signParams, NULL, FALSE, pbToBeSigned, cbToBeSigned, &pSignedMessage)) {
cout << "XadesSign() failed" << endl;
return;
}
vector<unsigned char> message(pSignedMessage->cbData);
copy(pSignedMessage->pbData, pSignedMessage->pbData + pSignedMessage->cbData, message.begin());
char* result = reinterpret_cast<char*>(message.data());
strcpy(dst, result);
}
}
Update
#cgo LDFLAGS: -L/opt/cprocsp/lib/amd64 -Wl,-rpath,/opt/cprocsp/lib/amd64 -lxades -v
didn't help
answer was in second error:
#cgo LDFLAGS: -L/opt/cprocsp/lib/amd64 -lxades -lcapi10 -lcapi20 -v
first time when I'm trying to add lcapi10 - missed that new error tells about lcapi20, not 10

Undefined reference to curlpp using code::blocks on kubuntu

I have a problem with curlpp library. I'll explain the steps that I followed.
Step 1: download and installation
download website: Download
$./configure
$make
$sudo make install
curlpp header files are located in /usr/local/include/
curlpp library files are located in /usr/local/lib/
Step 2: I used the following code:
#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>
#include <curlpp/Exception.hpp>
using namespace std;
int main()
{
char *url = (char*) "http://dbpedia.org/sparql";
string queryString = "PREFIX dbp: <http://dbpedia.org/resource/> "
"PREFIX dbp2: <http://dbpedia.org/ontology/> "
"SELECT ?abstract "
"WHERE { "
"dbp:Nikola_Tesla dbp2:abstract ?abstract . "
"FILTER langMatches(lang(?abstract), 'en')"
"}";
try
{
curlpp::Easy request;
string parameters = "query=" + curlpp::escape(queryString);
request.setOpt(new curlpp::options::Url(url));
request.setOpt(new curlpp::options::Verbose(true));
request.setOpt(new curlpp::options::PostFields(parameters));
request.perform();
}
catch (curlpp::RuntimeError & e)
{
std::cout << e.what() << std::endl;
}
catch (curlpp::LogicError & e)
{
std::cout << e.what() << std::endl;
}
return 0;
}//end function main
Errors
Undefined reference to curlpp ::Easy:Easy()
Undefined reference to curlpp ::escape (const std :: string &)
Undefined reference to curlpp ::Easy::setopt (curlpp OptionBase :: *)
Undefined reference to curlpp curlpp::Easy::setopt(curlpp OptionBase:: *)
etc.
After adding -lcurlpp as the picture shows: I got the following errors:
g++ -LSQLiteCpp-master/debug -o bin/Debug/EntityLinking
obj/Debug/DataLoader.o obj/Debug/Entity.o obj/Debug/Fact.o
obj/Debug/FactClass.o obj/Debug/Link.o obj/Debug/main.o
obj/Debug/ManageDb.o obj/Debug/SQLiteCpp-master/sqlite3/sqlite3.o
obj/Debug/tinyxml/tinystr.o obj/Debug/tinyxml/tinyxml.o
obj/Debug/tinyxml/tinyxmlerror.o obj/Debug/tinyxml/tinyxmlparser.o
-lpthread -ldl -lcurlpp SQLiteCpp-master/debug/libSQLiteCpp.a /usr/bin/ld: obj/Debug/main.o: référence au symbole non défini
«curl_easy_setopt##CURL_OPENSSL_3»
//usr/lib/x86_64-linux-gnu/libcurl.so.4: error adding symbols: DSO
missing from command line collect2: error: ld returned 1 exit status
Process terminated with status 1 (0 minute(s), 0 second(s)) 0
error(s), 0 warning(s) (0 minute(s), 0 second(s))
You need to link with -lcurlpp when compiling & linking your code.
Using Eclipse, I never got curlpp example01 working. Even after trying to set up the linkers and the includes. But I was able to compile it from a terminal:
g++ -o exe_name exe_name.cpp -L/usr/local/lib -lcurl -lcurlpp -I/usr/local/include
So I would suggest trying the terminal if Eclipse doesn't work for you.

Linker error when compiling a program that uses spidermonkey

I've been trying to learn spidermonkey and so have written the following code, adapted from this guide and while the program compiles properly, I get the following error during linking:
/usr/bin/ld: cannot open linker script file symverscript: No such file or directory
I'm using 64-bit Ubuntu 13.10, and here is the code (seems irrelevant to the problem, but can't hurt)
#include <jsapi.h>
#include <iostream>
#include <string>
int main()
{
std::string script = "var x = 10;x*x;";
jsval rval;
JSRuntime* runtime = 0;
JSContext* context = 0;
JSObject* globalob = 0;
if((!(runtime = JS_NewRuntime(1024L*1024L, JS_NO_HELPER_THREADS)))||
(!(context = JS_NewContext(runtime, 8192)))||
(!(globalob = JS_NewObject(context, NULL, NULL, NULL))))
{
return 1;
}
if(!JS_InitStandardClasses(context, globalob))
{
return 1;
}
if(!JS_EvaluateScript(context,globalob,script.data(),script.length(),"script",1,&rval))
{
return 1;
}
std::cout << JSVAL_TO_INT(rval) << "\n";
JS_DestroyContext(context);
JS_DestroyRuntime(runtime);
JS_ShutDown();
return 0;
}
compiled with the command
g++ main.cpp -o out $(js24-config --cflags --libs | tr "\n" " ")
Try to write this command instead,
g++ main.cpp -o main -I/usr/local/include/js/ -L/usr/local/lib/ -lmozjs1.8.5
regarding the path I wrote above, you must write your own path which include the library and JSAPI.h file included in,
And the last term is spidermonkey library, you will find it in lib folder, for me it exists in /usr/local/lib

How to compile Apache Avro C++ example

Probably a newbie mistake, but can anyone please tell me what I'm doing wrong here?
Any help is much appreciated.
I wrote this simple Makefile:
CC=g++
INC=-I/usr/local/avro-cpp-1.7.2 -I/usr/local/boost_1_53_0
cpx : generated.cc
$(CC) -o cpx generated.cc $(INC)
Which generates these the errors:
g++ -o cpx generated.cc -I/usr/local/avro-cpp-1.7.2 -I/usr/local/boost_1_53_0
/tmp/ccYymUVo.o: In function `main':
generated.cc:(.text+0x84): undefined reference to `avro::memoryOutputStream(unsigned long)'
generated.cc:(.text+0xb0): undefined reference to `avro::binaryEncoder()'
generated.cc:(.text+0x11e): undefined reference to `avro::memoryInputStream(avro::OutputStream const&)'
generated.cc:(.text+0x150): undefined reference to `avro::binaryDecoder()'
collect2: ld returned 1 exit status
make: *** [cpx] Error 1
Here's the source as supplied in the Avro examples directory:
#############################
# cpx.hh
#############################
#ifndef CPX_HH_1278398428__H_
#define CPX_HH_1278398428__H_
#include "boost/any.hpp"
#include "avro/Specific.hh"
#include "avro/Encoder.hh"
#include "avro/Decoder.hh"
namespace c {
struct cpx {
double re;
double im;
};
}
namespace avro {
template<> struct codec_traits<c::cpx> {
static void encode(Encoder& e, const c::cpx& v) {
avro::encode(e, v.re);
avro::encode(e, v.im);
}
static void decode(Decoder& d, c::cpx& v) {
avro::decode(d, v.re);
avro::decode(d, v.im);
}
};
}
#endif
and
#############################
# generated.cc
#############################
#include "cpx.hh"
#include "avro/Encoder.hh"
#include "avro/Decoder.hh"
int
main()
{
std::auto_ptr<avro::OutputStream> out = avro::memoryOutputStream();
avro::EncoderPtr e = avro::binaryEncoder();
e->init(*out);
c::cpx c1;
c1.re = 1.0;
c1.im = 2.13;
avro::encode(*e, c1);
std::auto_ptr<avro::InputStream> in = avro::memoryInputStream(*out);
avro::DecoderPtr d = avro::binaryDecoder();
d->init(*in);
c::cpx c2;
avro::decode(*d, c2);
std::cout << '(' << c2.re << ", " << c2.im << ')' << std::endl;
return 0;
}
Thanks.
1)
in your output, you don't link against the avrocpp library, although your comments about the LD_LIBRARY_PATH suggest that you got the link to work, but the example program failed to find the library when executing. Your compile line needs the linker option: -l avrocpp
2)
If the avrocpp library .so is not installed in a path that your runtime linker is configured to search, you can add the library path into the binary itself with the linker option -rpath.
Example 1: Assuming your avrocpp library is installed in /usr/local/lib (i.e. /usr/local/lib/libavrocpp.so), and your runtime linker doesn't look in /usr/local/lib, add the rpath by adding this option to your compiler command line:
-Wl,-rpath,/usr/local/lib
Example 2: Assuming your avrocpp library is installed in /usr/local/avro-cpp-1.7.2/lib (i.e. /usr/local/avro-cpp-1.7.2/lib/libavrocpp.so), add the rpath by adding this option to your compiler command line:
-Wl,-rpath,/usr/local/avro-cpp-1.7.2/lib
Try using avrogencpp with options -i < schema_file > -o < header_file >
Download and compile the Avro c++ sources https://stackoverflow.com/questions/40889705/how-to-compile-apache-avro-c-on-windows (this will generate the "avrogencpp.exe")
Download avro-tools http://avro.apache.org/releases.html#Download, and (with java installed)
run:
java -jar avro-tools-1.8.1.jar idl file.avdl > file.json
Edit the generated json file and delete the following
If you have any lines preceding the required structs at the beginning, delete them. (I had "protocol": "file", "namespace" : "some_optional_namespace", "types" :)
messages entry (at the bottom)
If you have multiple structs defined in the same json file, surround them all with "[ ]" (you should have commas between the different structs and make sure the last struct as not proceeded with a ","
Run
avrogencpp.exe -p - -n some_optional_namespace -U --input file.json --output file.hh