[ros-diffs] [peterw] 29897: - Make options.exe only write path variables if there is something to write. - Fix a bug in the way options.cmd was calling options.exe. - Move GCC environment setup to rosbe-gcc-env.cmd to support the next bullet. - Added the command 'chdefgcc' to allow easy switching of the current toolset. (automatically adjusts all include/lib/binary paths for the new location/GCC version)