- Add support for cross compiling so that OS X PowerPC builds can still be made on systems without rosetta (10.7+). (Compiling x86 binaries on ppc should also be possible.)
- Hard code gdtoa constants for OS X since the programs can’t always be run on the target.  (The values are the same for GCC and Clang.)
- Work around GCC 4.8 bug 54570
- Work around GCC 4.8 bug 54570
Merge branch 'maint'