On 10/05/17 18:16, Martin Sebor wrote: > In my (very quick) tests the warning appears to trigger on all > strictly incompatible conversions, even if they are otherwise > benign, such as: > > int f (const int*); > typedef int F (int*); > > F* pf1 = f; // -Wincompatible-pointer-types > F* pf2 = (F*)f; // -Wcast-function-type > > Likewise by: > > int f (signed char); > typedef int F (unsigned char); > > F* pf = (F*)f; // -Wcast-function-type > > I'd expect these conversions to be useful and would view warning > for them with -Wextra as excessive. In fact, I'm not sure I see > the benefit of warning on these casts under any circumstances. >
Well, while the first example should be safe, the second one is probably not safe: Because the signed and unsigned char are promoted to int, by the ABI but one is in the range -128..127 while the other is in the range 0..255, right? Bernd.
