[DO-981] qt package (!15)

Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Reviewed-on: https://git.avroid.tech/Conan/conan_build/pulls/15

recipes/opengl/all/test_package/test_package.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+
+#ifdef __APPLE__
+
+#include <OpenGL/gl.h>
+
+#else
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#if defined(__linux__) or defined(__FreeBSD__)
+
+bool init_context() { return true; }
+
+#endif
+
+#include <GL/gl.h>
+
+#endif
+
+bool init_context();
+
+int main()
+{
+    if (!init_context())
+    {
+       // std::cerr << "failed to initialize OpenGL context!" << std::endl;
+       // return -1;
+
+       // Don't fail if we can't init the context - won't work on a headless CI
+       // Instead, if we made it this far, then we were able to #include and link,
+       // count that as a success!
+       std::cout << "Linked test, but failed to initialize OpenGL context (headless platform?)" << std::endl;
+       return 0;
+    }
+    const char * gl_vendor = (const char *) glGetString(GL_VENDOR);
+    const char * gl_renderer = (const char *) glGetString(GL_RENDERER);
+    const char * gl_version = (const char *) glGetString(GL_VERSION);
+    const char * gl_extensions = (const char *) glGetString(GL_EXTENSIONS);
+    std::cout << "GL_VENDOR: " << (gl_vendor ? gl_vendor : "(null)") << std::endl;
+    std::cout << "GL_RENDERER: " << (gl_renderer ? gl_renderer : "(null)") << std::endl;
+    std::cout << "GL_VERSION: " << (gl_version ? gl_version : "(null)") << std::endl;
+    std::cout << "GL_EXTENSIONS: " << (gl_extensions ? gl_extensions : "(null)") << std::endl;
+    return 0;
+}