GCC - Attributes - warn_unused_result

常常發現有些人對於funcion的return value都不太理會，所以後來我就在function上面加上warn_unused_result這個attribute，當programmer沒有使用這個function的return value時，就會跳出warning，嚴格一點再加上-Werror就可以讓這些warning變成error。



GCC VERSION：4.5之原文

The warn_unused_result attribute causes a warning to be emitted if a caller
of the function with this attribute does not use its return value.
This is useful for functions where not checking the result is either a
security problem or always a bug, such as realloc.