Hi William,
I am having the same problem compiling cctbx stand-alone, or within CCP4. I've posted the error log here:
http://fennario.ucsc.edu/~wgscott/temp/cctbx_compile_errors.log
From the information given in the discussion that followed, you have installed Xcode 4.4 command line tools. So do I but I can't reproduce the problem with the cctbx trunk as of a few minutes ago. From the error log you linked to, the compilation of mmtbx/bulk_solvent/bulk_solvent_ext.cpp fails. Could you copy me the exact compiler invocation? Moreover, although it should not matter considering the compiler errors at hand, could you tell me which version of Boost you used?
Finally, a general remark is in order: thou shall never try to work around such problems by playing with --compiler. Instead, please, loudly complain on this forum: the cctbx must compile with the latest Xcode tools and a build directory setup with simply "python configure.py mmtbx". Best wishes, Luc