GetGCCRoot() for usual toolchain dir structures
GetGCCRoot() for usual toolchain dir structures

So don't depend on any special assumptions. See comments in the codes.
ArdaFu/rt-thread,weiyuliang/rt-thread,geniusgogo/rt-thread,armink/rt-thread,nongxiaoming/rt-thread,ArdaFu/rt-thread,gbcwbz/rt-thread,hezlog/rt-thread,hezlog/rt-thread,armink/rt-thread,geniusgogo/rt-thread,weety/rt-thread,gbcwbz/rt-thread,hezlog/rt-thread,gbcwbz/rt-thread,gbcwbz/rt-thread,weiyuliang/rt-thread,nongxiaoming/rt-thread,armink/rt-thread,ArdaFu/rt-thread,hezlog/rt-thread,gbcwbz/rt-thread,RT-Thread/rt-thread,weiyuliang/rt-thread,ArdaFu/rt-thread,weiyuliang/rt-thread,RT-Thread/rt-thread,RT-Thread/rt-thread,weety/rt-thread,weety/rt-thread,gbcwbz/rt-thread,nongxiaoming/rt-thread,weiyuliang/rt-thread,hezlog/rt-thread,geniusgogo/rt-thread,gbcwbz/rt-thread,ArdaFu/rt-thread,geniusgogo/rt-thread,weety/rt-thread,nongxiaoming/rt-thread,geniusgogo/rt-thread,weiyuliang/rt-thread,RT-Thread/rt-thread,geniusgogo/rt-thread,nongxiaoming/rt-thread,armink/rt-thread,ArdaFu/rt-thread,weety/rt-thread,armink/rt-thread,weety/rt-thread,RT-Thread/rt-thread,nongxiaoming/rt-thread,hezlog/rt-thread,weety/rt-thread,nongxiaoming/rt-thread,ArdaFu/rt-thread,armink/rt-thread,RT-Thread/rt-thread,armink/rt-thread,geniusgogo/rt-thread,weiyuliang/rt-thread,RT-Thread/rt-thread,hezlog/rt-thread