No gcc 4.2 compiler option in Xcode 4? - iphone

Question

In my Xcode 4 installation, I only have 2 compiler options:
Apple LLVM compiler 3.0
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 $.
No files or directories are removed or deleted in this process, so it is easy to undo if you need to compile with LLVM in the future.
Download - but do not install yet - xcode_4.1_for_lion.dmg or xcode_4.1_for_snow_leopard.dmg
Now, follow these steps to install Xcode 4.1 into /Developer-4.1:
Backup the working /Developer directory (where Xcode 4.2 is installed)
[ 15:30 jon#MacBookPro / ]$ sudo mv -v /Developer /Developer-4.2
Run the Xcode 4.1 installer using the default install location (/Developer)
Move the new Xcode 4.1 installation to /Developer-4.1:
[ 15:30 jon#MacBookPro / ]$ sudo mv -v /Developer /Developer-4.1
Move the Xcode 4.2 developer directory back to /Developer:
[ 15:30 jon#MacBookPro / ]$ sudo mv -v /Developer-4.2 /Developer
Edit the Xcode 4.2 GCC 4.2.xcspec file to get gcc 4.2 to show in the list of compiler options [1]:
[ 15:30 jon#MacBookPro / ]$ sudo vi "/Developer/Library/Xcode/PrivatePlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/GCC 4.2 (Plausible Blocks).xcplugin/Contents/Resources/GCC 4.2.xcspec"
Change lines 41 and 42 from this:
ShowInCompilerSelectionPopup = NO;
IsNoLongerSupported = YES;
To This:
ShowInCompilerSelectionPopup = YES;
IsNoLongerSupported = NO;
Backup the Xcode 4.2 iOS/Simulator Framework usr directories:
[ 15:30 jon#MacBookPro / ]$ sudo mv -v /Developer/Platforms/iPhoneOS.platform/Developer/usr /Developer/Platforms/iPhoneOS.platform/Developer/usr.backup
[ 15:30 jon#MacBookPro / ]$ sudo mv -v /Developer/Platforms/iPhoneSimulator.platform/Developer/usr /Developer/Platforms/iPhoneSimulator.platform/Developer/usr.backup
Copy Xcode 4.1 iOS/Simulator Framework usr directories to Xcode 4.2:
[ 15:30 jon#MacBookPro / ]$ sudo cp -rv /Developer-4.1/Platforms/iPhoneOS.platform/Developer/usr /Developer/Platforms/iPhoneOS.platform/Developer/usr
[ 15:30 jon#MacBookPro / ]$ sudo cp -rv /Developer-4.1/usr /Developer/Platforms/iPhoneSimulator.platform/Developer/usr
Copy the gcc and info iOS SDK library directories from Xcode 4.1 to Xcode 4.2 [2]:
[ 15:30 jon#MacBookPro / ]$ sudo cp -rv /Developer-4.1/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/gcc /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/gcc
[ 15:30 jon#MacBookPro / ]$ sudo cp -rv /Developer-4.1/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/info /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/info
Compile using gcc-4.2!
This is a blog post I've written with a little more info about this process. Feel free to leave a comment on the blog if you run into any issues or have any questions.
[1] If opening from a command line (using something like vi, emacs, nano, etc) make sure to either enclose the path in quotes "/long path/with spaces/in it/file.xcspec" or escape the spaces /some/long\ path/with\ spaces/in\ it/file.xcspec
[2] This is necessary because the iPhoneOS.platform SDK has its own seperate /usr/lib directories but the iPhoneSimulator.platform SDK does not

Answer 2

Xcode 4.3 has a specific folder /Applications/Xcode.app/Contents/Developer/Toolchains.
Is there a way to add other tool-chains as AVR-gcc and PIC32-gcc?