Adding GLM to project in Xcode 4

Question

I am trying to add GLM to a project in Xcode 4, but I cannot get it to compile. I have added the glm files to my project through the add files dialog.

I get a lexical/preprocessor issue and Xcode cannot find the file <cmath>.

I am not sure what I need to tweak to get this to build.

I have seen How do I add OpenGL Mathematics (GLM) to Xcode 4? already.

Answer 1

All you need to do is add the files to the project and #import "glm.hpp" (for Objective-C++; for simple C++ it should just be #include "glm.hpp").

A couple things to be careful of:

• The OpenGL Mathematics library, when you download it, comes with a bunch of stuff you don't need (test code, extraneous utilities). Adding these to your project will result in compile errors which I could not get rid of. The only directory you need is the glm/ directory; you can delete the test/, util/, doc/, and bench/ directories. If you were trying to follow "How do I add OpenGL Mathematics (GLM) to Xcode 4?" and were still having problems, this may be the thing which was tripping you up.

• The OpenGL Mathematics documentation tells you to include the or files. In Xcode 4, you should include them like "glm.hpp" or "*.hpp". Xcode will find the files no matter where in the project they are. Supposedly you can add a user-defined build setting "USE_HEADERMAP" and set it to "NO" to disable this, but I didn't have any luck with that.

• And, just in case, note that your code files using the OpenGL Mathematics library must be Objective C++ files (ending in ".mm"), not the default/plain Objective C files (ending in ".m"). It is very much a C++ library after all... :-)

I hope that help. I was just working through this myself, and I haven't had the chance to really push this (e.g. I've basically just added a mat4 object or two and made sure things still compiled), but it seems to be working.

Answer 2

I ran into the same problem and I solved it remaning my ViewController.m to ViewController.mm. Change the extension to .mm tells XCode that the file may contain C++ code inside. The article Write Object-C Code explains this in the Classes and Objects section.