Annex C (informative) Compatibility [diff]

C.4 C standard library [diff.library]

C.4.3 Modifications to declarations [diff.mods.to.declarations]

Header <cstring>: The following functions have different declarations:

(1.1)
strchr
(1.2)
strpbrk
(1.3)
strrchr
(1.4)
strstr
(1.5)
memchr

[c.strings] describes the changes.