Hi Mariusz, You forgot to generate/link the dictionary. You can see an example in the $ROOTSYS/test/Makefile or simply in the few lines below; g++ -g -Wall -fPIC -I$ROOTSYS/include -c MainEvent.cxx rootcint -f EventDict.cxx -c Event.h EventLinkDef.h g++ -g -Wall -fPIC -I$ROOTSYS/include -c EventDict.cxx g++ -g -Wall -fPIC -I$ROOTSYS/include -c Event.cxx g++ -shared -O Event.o EventDict.o -o libEvent.so g++ -o Event MainEvent.o Event.o EventDict.o -L$ROOTSYS/lib \ -lCore -lCint -lTree -lHist -lMatrix -lPhysics -lGraf -lm -ldl Rene Brun On Mon, 30 Sep 2002, Mariusz Sapinski wrote: > > Hello Rooters, > > I'd like to create a tree with RunHeader (one per run, ie. one per root > file) and with Events. I've created 2 classes: RunHeader and Event, both > following the example in $ROOTSYS/tests/. For both of them i can produce > dictionary and shared library. But when i link whole program i get the > message: > RunHeader.o: In function `RunHeader::Dictionary(void)': > RunHeader.o(.text+0x32): undefined reference to `RunHeader::Class_Name(void)' > RunHeader.o: In function `operator>>(TBuffer &, RunHeader const *&)': > RunHeader.o(.text+0x6d): undefined reference to `operator>>(TBuffer &, > RunHeader *&)' > RunHeader.o(.gnu.linkonce.d.__vt_9RunHeader+0xc0): undefined reference to > `RunHeader::ShowMembers(TMemberInspector &, char *)' > RunHeader.o(.gnu.linkonce.d.__vt_9RunHeader+0xc4): undefined reference to > `RunHeader::Streamer(TBuffer &)' > RunHeader.o: In function `RunHeader::StreamerNVirtual(TBuffer &)': > RunHeader.o(.RunHeader::gnu.linkonce.t.StreamerNVirtual(TBuffer &)+0x1d): > undefined reference to `RunHeader::Streamer(TBuffer &)' > collect2: ld returned 1 exit status > > So in principle i got 2 questions. > 1. Is my approach correct (to have 2 classes, both heritaging from > TObject) > 2. if(1 == 'yes') { printf("where is the source of my problem?\n"); } > > Thanks in advance (i always get an answer here so i can safely thank in > advance), > > Mariusz >
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