FYI - I got gcc 4.4 integrated into latest Xcode 3.2.4 including flags - see blog at http://skurganov.blogspot.com/

I m working on this myself.

Currently, it s looking like you have to inherit a built in compiler ref spec.

Adding a key of:

BasedOn = "com.apple.compilers.gcc.4_2";

Makes the plugin load correctly. However, there s the issue of invalid flags due to the apple specific compiler patches. I m working on that part right now.

I ve gotten the compile phase to work. To do this:

1. In /Developer/Library/Xcode/Plug-ins
2. cp "GCC 4.2.xcplugin" "GCC Arm 4.4.1.xcplugin"
3. cd "GCC Arm 4.4.1.xcplugin"/Contents
4. Modify Info.plist (may not be strictly necessary)

8c8
-   com.apple.xcode.compilers.gcc.arm-4_4_1
---
+   com.apple.xcode.compilers.gcc.4_2
12c12
-   GCC Arm 4.4.1 Compiler Xcode Plug-in
---
+   GCC 4.2 Compiler Xcode Plug-in

5. cd Resources
6. mv "GCC 4.2.xcspec" "GCC Arm 4.4.1.xcspec"
7. Modify "GCC Arm 4.4.1.xcspec"

10c10
-     Identifier = "com.apple.compilers.gcc.arm-4_4_1";
---
+     Identifier = "com.apple.compilers.gcc.4_2";
13,16c13,16
-     Name = "GCC Arm 4.4.1";
-     Description = "GNU Arm C/C++ Compiler 4.4.1";
-     Version = "arm-4.4.1";
---
+     Name = "GCC 4.2";
+     Description = "GNU C/C++ Compiler 4.2";
+     Version = "4.2";
39c39
-         "com.apple.compilers.gcc.headers.arm_4_4_1",
---
+         "com.apple.compilers.gcc.headers.4_2",
42c42
-     ExecPath = "$(PLATFORM_DEVELOPER_BIN_DIR)/gcc-arm.4.4.1";
---
+     ExecPath = "$(PLATFORM_DEVELOPER_BIN_DIR)/gcc-4.2";
48,49c48,49
-     SupportsZeroLink = No;
-     "SupportsPredictiveCompilation" = No;
---
+     SupportsZeroLink = Yes;
+     "SupportsPredictiveCompilation" = Yes;
52,53c52,53
-     "SupportsMacOSXDeploymentTarget" = No;
-     "SupportsMacOSXMinVersionFlag" = No;
---
+     "SupportsMacOSXDeploymentTarget" = Yes;
+     "SupportsMacOSXMinVersionFlag" = Yes;
88a89,90
-                     "-arch",
-                     "$(value)",

8. Link the compiler into /Developer/usr/bin/gcc-arm.4.4.1

Due to wiki reformatting, the diff s above are not exact, but the relevant information is there. The critical piece that I ve noted (and what you appear to have wrong above) is that the Identifier change must correspond with the version number change (with "." replaced with "_").

Getting rid of the -arch parameter works for compiles, but not for linking. Since my gcc won t accept this parameter I can t link at the moment. Unless I find another way to fix this, I ll probably put in a script instead of the gcc executable to yank out this option.