为什么我系统上的任何地方都不存在 strcpy_s?

I'm using clang on a Debian 8 system. I have the standard C++ headers. And yet, there is no header defining strcpy_s. Why is this?

# grep -iRHI 'strcpy_s' /usr 2>/dev/null
/usr/include/x86_64-linux-gnu/bits/string2.h:                ? __strcpy_small (dest, __strcpy_args (src),             
/usr/include/x86_64-linux-gnu/bits/string2.h:__STRING_INLINE char *__strcpy_small (char *, __uint16_t, __uint16_t,
/usr/include/x86_64-linux-gnu/bits/string2.h:__strcpy_small (char *__dest,
/usr/include/x86_64-linux-gnu/bits/string2.h:__STRING_INLINE char *__strcpy_small (char *, __STRING2_COPY_ARR2,
/usr/include/x86_64-linux-gnu/bits/string2.h:__strcpy_small (char *__dest,
/usr/src/broadcom-sta-6.30.223.248/src/include/bcmutils.h:#define bcm_strcpy_s(dst, noOfElements, src)            strcpy((dst), (src))

解决方案

Apparently, these don't exist because they don't exist. And I can find and install them by finding and installing them; or, alternatively, by coding them myself. Apparently this is a helpful solution, so let the upvotes begin.