board, add new dq stm32 board.

Signed-off-by: daoweifan <daoweifan@126.com>
newlib, add gcc newlib to support std c lib.

Signed-off-by: daoweifan <daoweifan@126.com>
libcpu, add cmsis core support api.

Signed-off-by: daoweifan <daoweifan@126.com>
gcc, add gnu gcc support.

Signed-off-by: daoweifan <daoweifan@126.com>
compile bug, remove compile bugs.

Signed-off-by: daoweifan <daoweifan@126.com>
sconscript, update gcc script.

Signed-off-by: daoweifan <daoweifan@126.com>
doc, add "Using the GNU Compiler Collection"

Signed-off-by: daoweifan <daoweifan@126.com>
wmconfig, add "-Wall -g3" option for gnu gcc

Signed-off-by: daoweifan <daoweifan@126.com>
ignore list, updated

Signed-off-by: daoweifan <daoweifan@126.com>