On: GCC's new fortification level: The gains and costs...

[Filligree]

If you use a pointer that’s been realloc’d, then I would not be surprised at all if gcc simply deletes the call to realloc.

[jupp0r → Filligree]

I would be surprised in the general case. Realloc does have side effects and the size parameter can be known at runtime only, etc.