96c5b8cbd1
See docs at - https://gustedt.gitlabpages.inria.fr/c23-library/#stdckdint - https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3047.pdf (Ch7.10) Compiler header: -450462cbac/clang/lib/Headers/stdckdint.h- New version of GCC (cd503b0616/gcc/ginclude/stdckdint.h) also provides this.