[ROOT] compiled namespace sometimes not accessable in rint

From: Micha D. Niskin (mniskin@yahoo.com)
Date: Sun May 25 2003 - 19:27:32 MEST 

Hello, 

	Thank you for your assistance. I have a problem which has me puzzled. I am 
using root version 3.05/05 on RedHat 9/i386/gcc-3.2.2. When I compile the 
sources below and run 'myroot' I am able to access the function in 'my_ns' 
namespace just fine. If I start up 'myroot' and try to immediately execute 
'script.C' I get the following error:

      root [0] .x script.C
      Error: say_hello() header declared but not defined FILE:script.C LINE:8
      *** Interpreter error recovered ***
      root [1] my_ns::say_hello()
      Error: say_hello() header declared but not defined FILE:(tmpfile) LINE:1
      *** Interpreter error recovered ***

However, if I start 'myroot' and do this instead everything is fine:

      root[0] my_ns::say_hello()
      hello
      root[1] .x script.C
      hello
      root[2] my_ns::say_hello()
      hello

I do not understand what is happening here. Below are the relevant files (also 
a tarball attachment):

//---------------------------my_ns.h
#ifndef __my_ns__
#define __my_ns__
namespace my_ns {
    void    say_hello();
};
#endif



//---------------------------my_ns.C
#include <iostream.h>
#include "my_ns.h"
void my_ns::say_hello() { cout << "hello" << endl; }



//---------------------------main.C
#include <TROOT.h>
#include <TRint.h>
int main(int argc, char **argv)
{
    // Create interactive interface
    TRint *theApp = new TRint("ROOT example", &argc, argv, NULL, 0);

    // Run interactive interface
    theApp->Run();

    return(0);
}



//---------------------------my_nsLinkDef.h
#ifdef __MAKECINT__
#pragma link off all functions;
#pragma link off all globals;
#pragma link off all classes;
#pragma link C++ nestedclass;
#pragma link C++ nestedtypedef;
#pragma link C++ namespace my_ns;
#pragma link C++ function my_ns::say_hello;
#endif



//---------------------------script.C
{
#ifndef __my_ns__
#include "my_ns.h"
#endif
    my_ns::say_hello();
}



##---------------------------Makefile
ARCH          = $(shell root-config --arch)

CXX           =
ObjSuf        = o
SrcSuf        = cxx
ExeSuf        =
DllSuf        = so
OutPutOpt     = -o # keep whitespace after "-o"

ROOTCFLAGS   := $(shell root-config --cflags)
ROOTLIBS     := $(shell root-config --libs)
ROOTGLIBS    := $(shell root-config --glibs)

ifeq ($(ARCH),linux)
# Linux with egcs, gcc 2.9x, gcc 3.x (>= RedHat 5.2)
CXX           = g++
CXXFLAGS      = -O -Wall -fPIC
LD            = g++
LDFLAGS       = -O
SOFLAGS       = -shared
endif

CXXFLAGS     += $(ROOTCFLAGS) -Wno-deprecated
LIBS          = $(ROOTLIBS) $(SYSLIBS)
GLIBS         = $(ROOTGLIBS) $(SYSLIBS)

###

HDRS        = my_ns.h
SRCS        = main.C my_ns.C
OBJS        = main.o my_ns.o
PROGRAM     = myroot

DICTHDRS        = my_nsDict.h
DICTSRCS        = my_nsDict.C
DICTOBJS        = my_nsDict.o

all:    $(PROGRAM)

$(PROGRAM): $(OBJS) $(DICTOBJS)
    @echo "Linking $(PROGRAM)..."
    @/bin/rm -f $(PROGRAM)
    @$(LD) $(LDFLAGS) $(OBJS) $(DICTOBJS) $(ROOTLIBS) -o $(PROGRAM)
    @chmod 555 $(PROGRAM)
    @echo "done"

###

my_ns.o: my_ns.h

my_nsDict.C: my_ns.h
    @echo "Generating dictionary..."
    @rootcint my_nsDict.C -c my_ns.h my_nsLinkDef.h
    @echo "done"

Thanks, 
-- 

Regards,
Micha D. Niskin <mniskin@yahoo.com>

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