To use:
../source-builder/sb-set-builder --log=l-4.11-sparc.txt \
--prefix=$HOME/development/rtems/4.11-ss \
--macros=snapshots/gcc-4.7-branch.mc \
4.11/rtems-sparc
This will clone the GCC git repo, checkout the 4.7 branch and
build the compiler. The 4.7.3 patch is still being used.