I've not seen an unused result warning change, but I've come across a case where a dead code warning appeared at higher optimisation levels when some function i

I've not seen an unused result warning change, but I've come across a case where a dead code warning appeared at higher optimisation levels when some function inlining revealed to the compiler that a certain function would call exit(). Still, I wouldn't expect so many of these that updating a new compiler would be too onerous.