Hi Matt,
I have no problems with your program (compiled & interpreted).
I am pretty sure that your problem is the following;
Looking at the results in compiled mode, one clearly sees that
the VTBL for the class TTree is wrong.
TTree::GetNbranches return TTree::GetAutoSave
==>
You are compiling with a TTree.h file that does not match the one
in $ROOTSYS/lib/libTree.so
==>
Let me know.
Rene Brun
>
> Why does the attached trivial `main.cxx' not work when it is compiled,
> but works just fine when it is interpreted? Here is the output from
> running the same file in both "compiled mode" and "interpreted mode":
>
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> begin compiled output
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> $ ./main
> ntuple has 1000000000 branches
> ntuple has nan entries
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> end compiled output
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> begin interpreted output
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> $ root -l -b -n -q main.cxx
> *******************************************
> * *
> * W E L C O M E to R O O T *
> * *
> * Version 2.22/06 23 June 1999 *
> * *
> * You are welcome to visit our Web site *
> * http://root.cern.ch *
> * *
> *******************************************
>
> CINT/ROOT C/C++ Interpreter version 5.14.6, Jun 10 1999
> Type ? for help. Commands must be C++ statements.
> Enclose multiple statements between { }.
> root [0]
> Processing main.cxx...
> ntuple has 32 branches
> ntuple has 998 entries
> (int)0
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> end interpreted output
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
> It is as if the TTree in the compiled version of "main.cxx" isn't being
> initialized by the TTree named "h10" in the test ".root" file
> (i.e. notice the nice round number, 1E+09, for the number of branches,
> and the NAN for the number of entries). However, clearly the TFile and
> TTree pointers are valid, as evidenced by the two assert statements.
>
> I have included a Makefile (for RedHat Linux 6.0 Intel) which builds the
> compiled version of "main.cxx". This Makefile may only require editing
> "ROOTSYS" in order to work on other platforms. Simply type "make check"
> to demonstrate my problem. The interpreted versions of "main.cxx" is
> run with the command "root -l -b -n -q main.cxx".
>
> Note that the test file,
> "/afs/slac.stanford.edu/public/users/langston/root/wabmc_test.root",
> which is obviously served by an AFS server, is also available via
> anonymous ftp at
> "ftp://ftp.slac.stanford.edu/users/langston/root/wabmc_test.root".
>
> Machine configuration
> ---------------------
> RedHat Linux 6.0 Intel
> kernel 2.2.5 (rpm version kernel-2.2.5-22)
> glibc 2.1.1 (rpm version glibc-2.1.1-6)
> egcs 1.1.2 (rpm version egcs-1.1.2-12)
> binutils 2.9.1.0.23 (rpm version binutils-2.9.1.0.23-1
> ROOT 2.22.04
>
> --
> Matthew D. Langston
> SLD, Stanford Linear Accelerator Center
> langston@SLAC.Stanford.EDU
>
> ------------------------------------------------------------------------
> #ifndef __CINT__
> #include <TROOT.h>
> #include <TFile.h>
> #include <TTree.h>
> #endif
>
> #include <cassert>
> #include <iostream>
>
> int
> main( int argc, const char* argv[] )
> {
> #ifndef __CINT__
> TROOT myApplication( "WAB", "WAB MC test" );
> #endif
>
> TFile* file = new TFile( "/afs/slac.stanford.edu/public/users/langston/root/wabmc_test.root" );
> assert( file != 0 );
>
> TTree* ntuple = ( TTree* ) file->Get( "h10" );
> assert( ntuple != 0 );
>
> cerr << "ntuple has " << ntuple->GetNbranches() << " branches" << endl;
> cerr << "ntuple has " << ntuple->GetEntries() << " entries" << endl;
>
> if ( ntuple->GetEntries() != 998 )
> {
> exit( 1 );
> }
>
> return 0;
> }
>
> ------------------------------------------------------------------------
> # -*- Makefile -*-
> #
> # Matthew D. Langston <langston@SLAC.Stanford.EDU>
> # 1999-06-27
>
> ## System dependent macros.
> CC = g++
> CXX = g++
> CPPFLAGS = -g -Wall $(ROOT_CFLAGS)
> LDFLAGS = $(ROOT_LDFLAGS) $(ROOT_LIBS)
>
> ## ROOT macros.
> ROOTSYS = /usr/local/root
> ROOT_CFLAGS = -I$(ROOTSYS)/include
> ROOT_LDFLAGS = -L$(ROOTSYS)/lib -Wl,-rpath,$(ROOTSYS)/lib
> ROOT_LIBS = -lCint -lNew -lBase -lClib -lCont -lFunc -lGraf -lGraf3d \
> -lHist -lHtml -lMatrix -lMeta -lMinuit -lNet -lPhysics \
> -lPostscript -lProof -lTree -lUnix -lZip -lm -ldl
>
> # Everything below here is "generic", meaning it only requires that you
> # have GNU make and gcc. You shouldn't have to edit anything below this
> # line.
> SOURCES = main.cxx
> PROGRAMS = main
> TESTS = $(PROGRAMS)
>
> .PHONY: all check clean realclean
> all: $(PROGRAMS)
>
> # Include dependency files.
> include $(SOURCES:.cxx=.d)
>
> realclean: clean; rm -f *.d $(PROGRAMS)
> clean:; rm -f core a.out *.o *~
> check: $(TESTS)
> @failed=0; all=0; \
> srcdir=$(srcdir); export srcdir; \
> for tst in $(TESTS); do \
> if test -f $$tst; then dir=.; \
> else dir="$(srcdir)"; fi; \
> if $(TESTS_ENVIRONMENT) $$dir/$$tst; then \
> all=`expr $$all + 1`; \
> echo "PASS: $$tst"; \
> elif test $$? -ne 77; then \
> all=`expr $$all + 1`; \
> failed=`expr $$failed + 1`; \
> echo "FAIL: $$tst"; \
> fi; \
> done; \
> if test "$$failed" -eq 0; then \
> banner="All $$all tests passed"; \
> else \
> banner="$$failed of $$all tests failed"; \
> fi; \
> dashes=`echo "$$banner" | sed s/./=/g`; \
> echo "$$dashes"; \
> echo "$$banner"; \
> echo "$$dashes"; \
> test "$$failed" -eq 0
>
> # pattern rules
> %.d: %.cxx; $(SHELL) -ec '$(CC) -MM $(CPPFLAGS) $< | sed '\''s/\($*\)\.o[ :]*/\1.o $@: /g'\'' > $@; test -s $@ || rm -f $@'
> %.o: %.cxx; $(CXX) -c $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
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