在SDK2.0里，wireless module被册掉了，将SDK1.0的wireless复制过来，编译会报错，后来移植yaffs的时候，编译也会报错：
CC fs/yaffs2/yaffs_vfs.o
fs/yaffs2/yaffs_vfs.c: In function 'yaffs_proc_read':
fs/yaffs2/yaffs_vfs.c:3253:37: error: macro "__DATE__" might prevent reproducible builds [-Werror=date-time]
"Multi-version YAFFS built:" __DATE__ " " __TIME__
^
fs/yaffs2/yaffs_vfs.c:3253:50: error: macro "__TIME__" might prevent reproducible builds [-Werror=date-time]
"Multi-version YAFFS built:" __DATE__ " " __TIME__
^
fs/yaffs2/yaffs_vfs.c: In function 'init_yaffs_fs':
fs/yaffs2/yaffs_vfs.c:3604:54: error: macro "__DATE__" might prevent reproducible builds [-Werror=date-time]
"yaffs built " __DATE__ " " __TIME__ " Installing.");
^
fs/yaffs2/yaffs_vfs.c:3604:1: error: macro "__TIME__" might prevent reproducible builds [-Werror=date-time]
"yaffs built " __DATE__ " " __TIME__ " Installing.");
^
fs/yaffs2/yaffs_vfs.c: In function 'exit_yaffs_fs':
fs/yaffs2/yaffs_vfs.c:3645:52: error: macro "__DATE__" might prevent reproducible builds [-Werror=date-time]
"yaffs built " __DATE__ " " __TIME__ " removing.");
^
fs/yaffs2/yaffs_vfs.c:3645:1: error: macro "__TIME__" might prevent reproducible builds [-Werror=date-time]
"yaffs built " __DATE__ " " __TIME__ " removing.");
搜索-Werror=date-time，发现这是gcc 4.9的一个bug：
参考https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1328858
能否修复这一bug，毕竟很多代码用到__TIME__和__DATE__ 宏。
