OpenGL: glGetError() returns invalid enum after call to glewInit()

Question

I use GLEW and freeglut. For some reason, after a call to glewInit(), glGetError() returns error code 1280, even with glewExperimental = GL_FALSE.

I cannot compile the shaders, glGetProgramInfoLog() returns "Vertex shader(s) were not successfully compiled before glLinkProgram() was called. Link failed." I was able to compile the shaders before.

Reinstalling the drivers didn't help.

Here's my code:

int main(int argc, char* argv[]) {     GLenum GlewInitResult, res;      InitWindow(argc, argv);      res = glGetError(); // res = 0      glewExperimental = GL_TRUE;     GlewInitResult = glewInit();          fprintf(stdout, "ERROR: %s\n", glewGetErrorString(GlewInitResult)); // "No error"     res = glGetError(); // res = 1280      glutMainLoop();      exit(EXIT_SUCCESS); }  void InitWindow(int argc, char* argv[]) {     glutInit(&argc, argv);      glutInitContextVersion(4, 0);     glutInitContextFlags(GLUT_FORWARD_COMPATIBLE);     glutInitContextProfile(GLUT_CORE_PROFILE);      glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE,     GLUT_ACTION_GLUTMAINLOOP_RETURNS);      glutInitWindowPosition(0, 0);     glutInitWindowSize(CurrentWidth, CurrentHeight);     glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);      WindowHandle = glutCreateWindow(WINDOW_TITLE);      GLenum errorCheckValue = glGetError();      if (WindowHandle < 1)     {         fprintf(stderr, "ERROR: Could not create new rendering window.\n");         exit(EXIT_FAILURE);     }      glutReshapeFunc(ResizeFunction);     glutDisplayFunc(RenderFunction);     glutIdleFunc(IdleFunction);     glutTimerFunc(0, TimerFunction, 0);     glutCloseFunc(Cleanup);     glutKeyboardFunc(KeyboardFunction); } 

What I am doing wrong?

Answer 1

Did you see the comment on this wiki page?

http://www.opengl.org/wiki/OpenGL_Loading_Library

It mentions why this occurs, and it says "in some cases you may still get GL_INVALID_ENUM after specifying glewExperimental depending on your glew version".

It sounds like it might be safe to ignore as long as you're not seeing any other problems.