[Bug middle-end/49905] Better sanity checking on sprintf src & dest to produce warning for dodgy code ?

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49905

--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2016-07/msg00056.html