OpenMP and Xcode

Hi guys,

Im plannin on learnin to work with OpenMp and im interested in using it in my OS X 10.5. i have Xcode 3.1.2 which is probably using gcc 4.2.x if im not mistaken. On openMPs official site their last version is for gcc 4.3 which i cannot use in Xcode. so can anyone tell me whether the last version has been tested in Xcode? (since apple makes certain changes to gcc compilers before they release them as official compilers of xcode). and if the new version has not been tested yet then what version can i use?