Jay K <jay.krell@xxxxxxxxxxx> writes: > I understand, you can do the pointer equality checks in arbitrary code. > So there is arbitrary breakage, given a certain uncommon construct. Function pointer comparisons are part of the C standard and they are used in real code. E.g., when I got the pointer equality rules wrong when working on GNU ld, I broke Tcl. You can compile libstdc++ in a mode in which it only uses pointer comparisons for typeinfo comparisons, but it's true that it defaults to using strcmp. The comment (libstdc++-v3/libsupc++/typeinfo) says it is to handle dynamic objects dlopen'ed with RTLD_LOCAL, which is a case where ELF breaks pointer equality. Ian
