How to define preprocessor macros for gInterpreter

ROOT
1

Hi,

I try to keep my code compatible for running it with aclic/cling/gcc. My example “funky.C” is attached.
for aclic

.L funky.C+
funky()

and with cling alone

.L funky.C
funky()

in simple macros

#include "TROOT.h"
#include "TInterpreter.h"
void macro() {
  gInterpreter->LoadMacro("funky.C+");
  gROOT->ProcessLine("funky();");
}

and with standalone compilation (key ingredient is “int main() { funky(); return 0; }”

CPPFLAGS=-Wall -Wextra
CC=g++
all: funky

funky: funky.o

clean:
	rm -f funky funky.o

.PHONY: clean

Looking at the macro, you’ll see that i have a preprocessor #ifndef, which I use by changing between

make -W funky.C

and

make -W funky.C CPPFLAGS="-DLET_FUNK_OUT=1"

This is also handled correctly by cling

#define LET_FUNK_OUT
.L funky.C
funky()

and in macros

#include "TROOT.h"
#include "TInterpreter.h"
#define LET_FUNK_OUT
void macro() {
  gInterpreter->LoadMacro("funky.C"); // NO + here
  gROOT->ProcessLine("funky();");
}

Is there a way to tell the aclic compilation to set LET_FUNK_OUT in the way gcc handles -D options?
(looking for a solution which does not require editing funky.C, loading additional files however is within specs)
funky.C (198 Bytes)

2

You may write this inside ~/rootlogon.C:

TString flags = gSystem->GetFlagsOpt();
flags+=" -DLET_FUNK_OUT=1";
gSystem->SetFlagsOpt(flags);

It may work also with

TString cmd = gSystem->GetMakeSharedLib();
//Modify your cmd as wished
gSystem->SetMakeSharedLib(cmd);