关于overflow

gcc支持以下flag:

ccflags-y += -fstrict-overflow -Wstrict-overflow=5

ccflags-y += -Wall -Wtype-limits -Wsign-compare

ccflags-y += -Wextra

 

gcc中关于 -fstrict-overflow的介绍

https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-fstrict-overflow-1091 

以及integer_overflow的介绍

http://www.pixelbeat.org/programming/gcc/integer_overflow.html