let mut infoLog = Vec::with_capacity(1024);
let mut len: i32 = 0;
gl::GetShaderInfoLog (shader_id, 1024-1, &mut len as *mut GLsizei, infoLog.as_mut_ptr() as *mut GLchar),
let err_str= String::from_raw_parts(ptr, len as usize,1024-1);
mem::forget(infoLog);