Visual Studio provides debug versions of CRT ( /MTd , /MDd ):
Older versions used a single monolithic DLL (like msvcrt.dll or msvcr120.dll ), while newer ones use versioned filenames : Version Range Description msvcrt.dll , msvcrXX.dll
When you compile with /GS (Buffer Security Check) and /sdl (SDL checks), the compiler warns you to use the _s variants. While these functions are not universally loved (the ISO C standard eventually created a different, less intrusive set of bounds-checking interfaces), they are undeniably better for security.
| CentOS 7 3.10.0-1160 | CentOS 8 4.18.0-348 | Debian 9 4.9.0-16 | Debian 10 4.19.0-17 | Debian 11 5.10.0-8 | Debian 12 6.1.0-18 | Fedora 35 5.16.18-200 | OpenSUSE 15.3 5.3.18-59.19 | Ubuntu 16 4.15.0-142 | Ubuntu 18 4.15.0-159 | Ubuntu 20 5.13.0-28 | Ubuntu 22 5.15.0-30 | |
| APCI-1016 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1032 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1500 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1516 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1564 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1648 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1696 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1710 / APCIe-1711 | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-1712 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-2016 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-2032 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-2200 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-3001 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-3120 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-3200 | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | IN PROGRESS | PASS | IN PROGRESS |
| APCI-3504 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-3600 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCI-3701 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-040 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-1516 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-1532 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-1564 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-1711 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-2032 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| APCIe-2200 | PASS | PASS | PASS | PASS | PASS | IN PROGRESS | PASS | PASS | PASS | PASS | PASS | PASS |
| xPCI-3xxx | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS | PASS |