Question

I just upgraded to Xcode 4.2 and iOS SDK 5 earlier today. But everything seems different with new compilers.

There are two “Compiler for C/C++/Objective-C” options now, “Apple LLVM compiler 3.0” and “LLVM GCC 4.2”. GCC 4.2 is missing.

Apple LLVM compiler 3.0, builds really fast(I like that), gives me 999+ warnings, and my game can no longer run. It looks like there’s some differences on memory, and it crashes when loading our game’s scripts.

LLVM GCC 4.2 is so god damn slow, I still cannot finish one build after hours on my i7 machine.

And, one more thing is our engine uses gcc command lines to build(instead of xcode).

So, it leads to one question, how can I use gcc 4.2 in Xcode 4.2? Is that even possible?

Answer 1

Here is a way to enable compiling with gcc 4.2 in xcode 4.2. Most of this is done via command line so when you see lines like this: [ 15:30 jon@MacBookPro / ]$, you need to open up a Terminal and run the command after the $.

No files or directories are removed or deleted in this process, so it is easy to undo if you need to compile with LLVM in the future.

1. Download – but do not install yet – xcode_4.1_for_lion.dmg or xcode_4.1_for_snow_leopard.dmg

2. Now, follow these steps to install Xcode 4.1 into /Developer-4.1:

   1. Backup the working /Developer directory (where Xcode 4.2 is installed)

   [ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer /Developer-4.2
   

3. Run the Xcode 4.1 installer using the default install location (/Developer)

4. Move the new Xcode 4.1 installation to /Developer-4.1:

   [ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer /Developer-4.1
   

5. Move the Xcode 4.2 developer directory back to /Developer:

   [ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer-4.2 /Developer