On Fri, Dec 5, 2025 at 11:09 AM Tom Lane <[email protected]> wrote: > Apparently, latest gcc is able to notice that constructions like > > const char *str = ...; > char *ptr = strchr(str, ':'); > > are effectively casting away const. This is a good thing and long > overdue, but we have some work to do to clean up the places where > we are doing that.
Yeah, one of the qualifier-preserving generic functions that C23 invented: bsearch, memchr, strchr, strpbrk, strrchr, strstr, wcschr, wcspbrk, wcsrchr, wmemchr, and wcsstr. The synopses use QVoid or QChar to mean "same qualifier", a bit like C++ function templates. We could probably benefit from some of that in our own code node, list, tree etc code, as it only requires C11 _Generic to implement. https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf
