Question

In my Xcode 4 installation, I only have 2 compiler options:

1. Apple LLVM compiler 3.0
2. GCC LLVM 4.2

In many Xcode examples I have seen that GCC 4.2 is shown as a third option, but this simply isn’t there. I intentionally did a clean installation of XCode 4. Is there a standard method for adding GCC 4.2 if it’s not already there? One of my projects requires that I use GCC (and not GCC LLVM), the other projects I am happy with GCC LLVM, so it’s only an issue for that one.

Answer 1

Here is a way to enable compiling with gcc 4.2 in xcode 4.2. This is mostly done via command line so when you see lines starting with: [ 15:30 jon@MacBookPro / ]$, you need to open up Terminal.app and run the command that starts 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