Re: problem at compilation with a derivative of TSelector

Salut Marc,

Marc Escalier wrote:
> thanks Rene,
>
> it works, thanks to your help
>
> but if you have time, may i understand the following behaviour :
>
> *one produces a dictionnary .so, for example in a "non compiled"
> program with
> mychain_data->Process("SelectorTest.C+")
>

When you specify the "+, your file SelectorTest.C is COMPILED with the normal compiler.
This is done via the ACLIC processor that

   -generates the dictionary file and compiles it   -compiles the file SelectorTest.C
  -generates the shared lib SelectorTest.so out of the dictionary file and SelectorTest.o
> *then, put the dependencies in the Makefile
You do not need a Makefile to do this. You better use root.exe that does it automatically for you
>
> *then the compiled program works (doesn't crash) only if i put :
> mychain_data->Process("SelectorTest.C+")
>
> ==>whereas if i put in the compiled program :
> mychain_data->Process("SelectorTest.C") // here without the "+"
> because the .so yet exists.
>
> then it crashes :
> would you know why ?
>

I cannot reproduce your problem with your version of SelectorTest.C. Could you run the small program that I suggested yesterday.

   do:
  root -l mymain.C
or
  root > .x mymain.C
where mymain.C is:
int mymain()
{
  TChain *mychain_data=new TChain("PAUReco");   mychain_data->Add("ntuple.root");  

  return mychain_data->Process("SelectorTest.C"); }

Rene

> (just in case, full log here :
> /afs/cern.ch/user/e/escalier/public/MinimalSelector
>
> it crashes at this instruction (of the compiled program) :
> mychain_data->Process("SelectorTest.C")
>
> putting some prints, i see that it doesn't do begin the "Begin" of the
> selector
>
> i put a complete log : "crash.txt"
> (i had to do LD_LIBRARY_PATH=$LD_LIBRARY_PATH:. before to launch the
> program
> )
>
> *** Break *** segmentation violation
> Attaching to program: /proc/14683/exe, process 14683
> [Thread debugging using libthread_db enabled]
> 0xffffe410 in __kernel_vsyscall ()
> #1 0x00c9b5b3 in __waitpid_nocancel () from /lib/libc.so.6
> #2 0x00c4007b in do_system () from /lib/libc.so.6
> #3 0x00da3ead in system () from /lib/libpthread.so.0
> #4 0xf7a7a11d in TUnixSystem::Exec(char const*) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCore.so
>
> #5 0xf7a7f62b in TUnixSystem::StackTrace() ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCore.so
>
> #6 0xf7a803cd in TUnixSystem::DispatchSignals(ESignals) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCore.so
>
> #7 0xf7a804cd in SigHandler(ESignals) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCore.so
>
> #8 0xf7a76d82 in sighandler(int) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCore.so
>
> #9 <signal handler called>
> #10 0x00c6428a in _IO_seekpos_unlocked () from /lib/libc.so.6
> #11 0x00c62cc9 in fsetpos@@GLIBC_2.2 () from /lib/libc.so.6
> #12 0xf722d33c in G__interpret_func ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCint.so
>
> #13 0xf71d0be0 in Cint::G__CallFunc::ExecInterpretedFunc(G__value*) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCint.so
>
> #14 0xf71d0de7 in Cint::G__CallFunc::Execute(void*) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCint.so
>
> #15 0xf7a63a1b in TCint::CallFunc_ExecInt(void*, void*) const ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libCore.so
>
> #16 0xf65fedae in TSelectorCint::Begin(TTree*) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libTree.so
>
> #17 0xf4c39fa0 in TTreePlayer::Process(TSelector*, char const*, long
> long, long long) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libTreePlayer.so
>
> #18 0xf4c39b35 in TTreePlayer::Process(char const*, char const*, long
> long, long long) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libTreePlayer.so
>
> #19 0xf660ac36 in TTree::Process(char const*, char const*, long long,
> long long) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libTree.so
>
> #20 0xf65dece9 in TChain::Process(char const*, char const*, long long,
> long long) ()
> from
> /afs/cern.ch/atlas/software/builds/DetCommon/15.6.9/InstallArea/i686-slc5-gcc43-opt/lib/libTree.so
>
> #21 0x0804b253 in main ()
> A debugging session is active.
>
> Inferior 1 [process 14683] will be detached.)
>
> ==========================================
> ==========================================
> ==========================================
> On Tue, 13 Jul 2010, Rene Brun wrote:
>
>> Marc,
>>
>> You need to generate a dictionary for your selector class. If you do
>> not know how to do it, I strongly recommend to use ACLIC in teh
>> following way that will automatically generate the dictionary for you
>> and also the processing will be faster.
>>
>> Replace your main.C by mymain.C as
>> int mymain()
>> {
>> TChain *mychain_data=new TChain("PAUReco");
>> mychain_data->Add("ntuple.root");
>>
>> return mychain_data->Process("SelectorTest.C+"); //note the "+"
>> }
>>
>> and execute it with
>> root -l mymain.C
>>
>> Rene Brun
>>
>> Marc Escalier wrote:
>>> Dear Rooters,
>>>
>>> i occur a problem of compilation when using a class created with a
>>> MakeSelector :
>>>
>>> SelectorTest.o: In function `SelectorTest::IsA() const':
>>> SelectorTest.C:(.text._ZNK12SelectorTest3IsAEv[SelectorTest::IsA()
>>> const]+0x7): undefined reference to `SelectorTest::Class()'
>>> SelectorTest.o:(.rodata._ZTV12SelectorTest[vtable for
>>> SelectorTest]+0xe8): undefined reference to
>>> `SelectorTest::ShowMembers(TMemberInspector&, char*)'
>>> SelectorTest.o:(.rodata._ZTV12SelectorTest[vtable for
>>> SelectorTest]+0xec): undefined reference to
>>> `SelectorTest::Streamer(TBuffer&)'
>>>
>>> while i don't occur with one created with MakeClass()
>>>
>>> Theses members are not in the class SelectorTest but rather in the
>>> TObject from which SelectorTest derivates
>>> An expert told me that the reason would be that the class created by
>>> MakeSelector would derive from "TObject"...
>>>
>>> would you have an idea of what is missing in my code and/or Makefile ?
>>>
>>> To make you loose the less time possible, i provide a very minimum
>>> standalone example here :
>>> lxplus :
>>>
>>> /afs/cern.ch/user/e/escalier/public/MinimalSelector
>>>
>>> any suggestion would be appreciated
>>>
>>> Thank you
>>>
>>> (
>>> just in case you would not have time to see the code on lxplus, the
>>> Makefile is :
>>> main: SelectorTest.o main.o
>>> /bin/rm -f main
>>> g++ -o main `root-config --ldflags --libs --glibs` -lRooFit
>>> -lRooFitCore -lMinuit main.o SelectorTest.o
>>>
>>> SelectorTest.o: SelectorTest.C
>>> g++ -c `root-config --cflags` SelectorTest.C
>>>
>>> main.o: main.C
>>> g++ -c `root-config --cflags` main.C
>>>
>>> clean: /bin/rm *.o
>>> )
>>>
>>
>>
>
Received on Wed Jul 14 2010 - 08:36:25 CEST