GLFW not opening any window under Wayland

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1

Hi,

I’m currently learning WebGPU, through this tutorial. While I was trying to set up a very basic C++ project using GLFW, I ran into the problem that no window was showing up at all.

It’s a flake project using CMake. The relevant part of flake.nix:

          nativeBuildInputs = with pkgs; [
            # Development Tools
            llvm.lldb
            cmake
            cmakeCurses
            glfw-wayland
            # libxkbcommon
            # wayland-protocols
            # extra-cmake-modules

            clang-tools
            llvm.clang
          ];

The actual C++ code:

#include <GLFW/glfw3.h>

int main() {
  if (!glfwInit()) {
    std::cerr << "Could NOT initialize GLFW!" << std::endl;
    return 1;
  }

  GLFWwindow *window = glfwCreateWindow(640, 400, "WebGPU for C++", NULL, NULL);
  if (!window) {
    std::cerr << "Could NOT open window!" << std::endl;
    glfwTerminate();
    return 1;
  }

  glfwMakeContextCurrent(window);

  while (!glfwWindowShouldClose(window)) {
    glfwPollEvents();
  }

  glfwTerminate();
}

Relevant CMakeLists.txt:

add_executable(App main.cpp)
set_target_properties(App PROPERTIES COMPILE_WARNING_AS_ERROR ON)
target_link_libraries(App PRIVATE glfw)

After I built the project and ran the executable, no window showed up and the execution just got stuck there forever (because of the while loop).

I assumed it was because glfw wasn’t compiled with the flag -DGLFW_USE_WAYLAND=ON but I am specifically using the glfw-wayland dependency and it automatically sets that flag here.

Am I missing some dependencies? Or did I miss something in CMakeLists.txt? Any help would be appreciated. Thanks!