This is a recipe to convert macro(s) to shared libraries
(to automatize this "make" is your friend). In a future version we
hope to make this more automatic and let CINT do most of the work
(bypassing the rootcint step).
You've to do the following:
- to an existing macro, add the needed header files. Use ifdef's so you
still can run the macro's via the interpreter. E.g. file myfunc.cxx:
#ifndef __CINT__
#include <TH1.h> // any ROOT header
#include "myheader.h" // any private header
#endif
void myfunc(int iopt)
{
// here function code
}
- create a header file containing the prototype of your function. E.g.
myfunc.h:
void myfunc(int iopt);
- create a LinkDef.h file so rootcint knows what functions to process.
E.g. MyLinkDef.h:
#ifdef __CINT__
#pragma link off all globals;
#pragma link off all classes;
#pragma link off all functions;
#pragma link C++ function myfunc;
#endif
- Run rootcint:
rootcint -f mydict.cxx -c myfunc.h MyLinkDef.h
- Compile the two sources:
g++ -fPIC -c myfunc.cxx
g++ -fPIC -c mydict.cxx
g++ shared -o myfunc.so myfunc.o mydict.o
- Now you are ready to use the shared lib in root. E.g.:
root
root [0] gSystem.Load("myfunc")
root [1] myfunc(99)
- myfunc() can also be used in buttons are anywhere else.
Cheers, Fons.
PS: to see the needed compiler options for your platform see the
$ROOTSYS/test/Makefile and look how libEvent.so is compiled.
HANS WENZEL, FNAL: 630 840 8240 HOME: (630) 393 1756 OR 393 1873 wrote:
>
> FNAL, 12-MAY-1998
>
> hi
>
> I am just a beginner concerning root. My question is the following is there an
> automatic procedure which i can use to transform working cint macros into
> standalone c++ programs that i can then link with the root libraries.
> e.g i would like to transform hserv.C and hclient.C from the tutorials
> directory and and then run them without having to go through the root command
> lines.
>
> cheers thanks for any help
>
> Hans
--
Org: CERN, European Laboratory for Particle Physics.
Mail: 1211 Geneve 23, Switzerland Phone: +41 22 7679248
E-Mail: Fons.Rademakers@cern.ch Fax: +41 22 7677910
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