Compiling a Root script as an executable

ROOT
1

Hi all,

Here is a project that I’m trying to compile a Root file that hasn’t worked. What I’m trying to do is to either create an executable outside of the ROOT environment, or to run it in Root, without it interpreting every line. Below is the program and the error message I get from the terminal.

-This was ran on Red Hat Fedora Core 1 with gcc 3.3.2

#include “TROOT.h”
#include “TSystem.h”
#include “TChain.h”
#include “TH2D.h”
#include “TDirectory.h”
#include “TList.h”
#include <stdlib.h>
#include <stdio.h>
#include “Rtypes.h”
#include “TChainElement.h”
#include “TTree.h”
#include “TCache.h”
#include “TFile.h”

int main(void)
{

TFile f("./EX_SF_1994_9.0.root");
TTree Coincidences = (TTree)gDirectory->Get(“Coincidences”);

//Declaration of leaves types - TTree Coincidences
//
//------
//

Int_t rsectorID1, rsectorID2, moduleID1, moduleID2;
Int_t submoduleID1, submoduleID2, crystalID1, crystalID2;

//
//Set branch addresses - Coincicences

Coincidences->SetBranchAddress(“rsectorID1”,&rsectorID1);
Coincidences->SetBranchAddress(“rsectorID2”,&rsectorID2);
Coincidences->SetBranchAddress(“moduleID1”,&moduleID1);
Coincidences->SetBranchAddress(“moduleID2”,&moduleID2);
Coincidences->SetBranchAddress(“submoduleID1”,&submoduleID1);
Coincidences->SetBranchAddress(“submoduleID2”,&submoduleID2);
Coincidences->SetBranchAddress(“crystalID1”,&crystalID1);
Coincidences->SetBranchAddress(“crystalID2”,&crystalID2);

Int_t nentries = Coincidences->GetEntries();

Int_t nbytes = 0;
Int_t NRING = 18;
Int_t NDET = 672;
Int_t j = 0, k = 0;

TH2D *sinogram_u2[NRING][NRING];
char hname[20];

for (j=0; j < NRING; j++)
{
for (k=0; k < NRING; k++)
{
sprintf(hname,“S_I%d_%d”,j,k);
sinogram_u2[j][k] = new TH2D(hname,“UShort Integer Sinogram”,
NDET/2,0,NDET/2-1,
NDET/2,-NDET/4,NDET/4-1);
}
}
}

Error statement

/tmp/ccuUJxah.o(.text+0x36): In function main': : undefined reference toTFile::TFile[in-charge](char const*, char const*, char const*, int)’
/tmp/ccuUJxah.o(.text+0x41): In function main': : undefined reference togDirectory’
/tmp/ccuUJxah.o(.text+0x53): In function main': : undefined reference togDirectory’
/tmp/ccuUJxah.o(.text+0x3e1): In function main': : undefined reference toTH2D::TH2D[in-charge](char const*, char const*, int, double, double, int, double, double)’
/tmp/ccuUJxah.o(.text+0x424): In function main': : undefined reference toTObject::operator delete(void*)’
/tmp/ccuUJxah.o(.text+0x46a): In function main': : undefined reference toTFile::~TFile in-charge’
/tmp/ccuUJxah.o(.text+0x490): In function main': : undefined reference toTFile::~TFile in-charge’
/tmp/ccuUJxah.o(.gnu.linkonce.t._ZN7TObjectnwEj+0xd): In function TObject::operator new(unsigned)': : undefined reference toTStorage::ObjectAlloc(unsigned)'
collect2: ld returned 1 exit status
make: *** [tester7] Error 1

Any suggestions would be extremely helpful.

Thanks,
ross

2

As far as I can tell you did not specify how it failed in this case.

[quote]/tmp/ccuUJxah.o(.text+0x36): In function main': : undefined reference to TFile::TFile[in-charge](char const*, char const*, char const*, int)’
collect2: ld returned 1 exit status
make: *** [tester7] Error 1 [/quote]
Sorrowfully you did not specify the command that lead to this. From the output I am guessing that you have a makefile which has the equivalent to something simlar to:

g++ mymain.cc -I$ROOTSYS/include

where you forgot to list the root libraries (or did not list the correct one).
you should have something more like

g++ mymain.cc `root-config --cflags --libs`

Cheers,
Philippe.

3

Hi Philippe,

Thank you very much for your help. The program runs great with the command line:
g++ filename.cpp `root-config --cflags --libs
You were right on the money :slight_smile:. Still pretty much a novice with c++ and using the compiler correctly :confused:.

Thanks,

ross