Invoke root class in Qt Project

ROOT
1

I try to invoke root class in Qt project, but most of them failed.

by add some cmd in the .pro file

INCLUDEPATH += \
    /usr/local/opt/root6/include
LIBS += \
    -L/usr/local/opt/root6/lib

QMAKE_PRE_LINK += /usr/local/opt/root6/bin/root-config --cflags --libs

and source code

#include "TMath.h"
...
ui->label->setText(QString::number(TMath::Pi()+Int_t(32),10,10));

successfully, it works. But, that’s all. When I try to include other class, TString ,for example, it breakdown.

symbol(s) not found for architecture x86_64
linker command failded with exit code 1(use -v to see invocation)

Have you ever met this case? Thank you~

some codes attached below.
QtRoot.zip

2

I don’t think it works as you intend to.
Most probably, root-config will be called before linking but no qmake variables will be changed.
You should add list of used ROOT libraries to LIBS

3

Great! It works, Thanks so much!

follow your suggestion, I delete QMAKE_PRE_LINK code, and append the lib.

LIBS += \
    -L/usr/local/opt/root6/lib -lCore -lImt -lRIO -lNet -lHist -lGraf \
    -lGraf3d -lGpad -lTree -lTreePlayer -lRint -lPostscript -lMatrix \
    -lPhysics -lMathCore -lThread -lMultiProc -pthread -lm -ldl -rdynamic

Now, TFile, TString, TTree work well. Previously，I have try similar ways, but failed, maybe arising from improper settings. Anyway, thanks again!