When using contexts, compiling with optimizations takes several minutes

[mdparker]

This was reported in the forums. I've verified with the following test app. Compile with dub -brelease --single app.d (with or without -ax86_64) will appear to hang for several minutes. I've only tested on Windows with DMD.

#!user/bin/env dub
/+ dub.sdl:
name "testgl"
dependency "derelict-glfw3" version="~>4.0.0-beta"
dependency "derelict-gl3" version="~>2.0.0-beta"
versions "DerelictGL3_Contexts"
+/
import derelict.glfw3;
import derelict.opengl;

mixin glContext;
GLContext ctx;

void main()
{
    DerelictGL3.load();
    DerelictGLFW3.load();

    if(!glfwInit()) throw new Exception("Failed to initialize GLFW");
    scope(exit) glfwTerminate();

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

    auto window = glfwCreateWindow(1024, 768, "Testing 1...2...3!", null, null);
    if(!window) throw new Exception("Failed to create GLFW window");

    glfwMakeContextCurrent(window);
    glfwSetKeyCallback(window, &keyCallback);

    ctx.load();
    ctx.glClearColor(0.2f, 0.3f, 0.3f, 1.0f);

    while(!glfwWindowShouldClose(window)) {
        glfwPollEvents();
        ctx.glClear(GL_COLOR_BUFFER_BIT);

        glfwSwapBuffers(window);
    }
}

extern(C) nothrow
void keyCallback(GLFWwindow* window, int key, int scanCode, int action, int mode)
{
    if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
        glfwSetWindowShouldClose(window, GL_TRUE);
    }
}