Canvas not showing on MacOS 10.15

ROOT
1

_ROOT Version: 6.19
_Platform: MacOS Catalina 10.15.4
_Compiler: clang 11.0.0

When I run without compiling, like root main.cpp, everything works well.
But when I compile using CLion, everything except canvas works well. Only the canvas-thing is not showing.
I’ve done

  • gSystem->ProcessEvents()
  • gSystem->ProcessEvents() x2
  • wait for input at the end of draw

CMakeLists.txt

cmake_minimum_required(VERSION 3.15)
project(nn)
set(CMAKE_CXX_STANDARD 14)

find_package(ROOT 6.19 REQUIRED)
add_executable(nn main.cpp)

target_link_libraries(nn PUBLIC
        ROOT::Core
        ROOT::Imt
        ROOT::RIO
        ROOT::Net
        ROOT::Hist
        ROOT::Graf
        ROOT::Graf3d
        ROOT::Gpad
        ROOT::ROOTVecOps
        ROOT::Tree
        ROOT::TreePlayer
        ROOT::Rint
        ROOT::Postscript
        ROOT::Matrix
        ROOT::Physics
        ROOT::MathCore
        ROOT::Thread
        ROOT::MultiProc
        ROOT::ROOTDataFrame)

main.cpp

#include <iostream>
#include <chrono>
#include "TRandom3.h"
#include "TCanvas.h"
#include "TGraph.h"
#include "TSystem.h"

using std::cout;
using std::endl;


int main() {
    
    auto* rnd = new TRandom3;
    rnd->SetSeed(std::chrono::high_resolution_clock::now().time_since_epoch().count());
    auto* c1 = new TCanvas("c1","c1");
    
    cout << rnd->Gaus() << endl;
    cout << rnd->Rndm() << endl;
    
    int x[] = {1,2,3};
    int y[] = {1,2,3};
    
    c1->cd();
    auto* graph = new TGraph(3, x, y);
    graph->Draw();
    c1->Update();
    gSystem->ProcessEvents();
    gSystem->ProcessEvents();
    
    
    return 0;
}

CLion build messages

Compiling 'main.cpp' ...
/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake --build /Users/yonggyulee/CLionProjects/nn/cmake-build-debug --target CMakeFiles/nn.dir/main.cpp.o -- -j 6 -f /Users/yonggyulee/CLionProjects/nn/cmake-build-debug/CMakeFiles/nn.dir/build.make --always-make
Building CXX object CMakeFiles/nn.dir/main.cpp.o
/Library/Developer/CommandLineTools/usr/bin/c++  -DVECCORE_ENABLE_VC -isystem /Applications/root_v6.19.02/include  -g -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk   -std=gnu++14 -o CMakeFiles/nn.dir/main.cpp.o -c /Users/yonggyulee/CLionProjects/nn/main.cpp

Compilation of 'main.cpp' finished
2

You need a TApplication

3

That worked. Thanks!

4

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