Header <cstring> ([cstring.syn]): The following functions have different declarations:
strchr
strpbrk
strrchr
strstr
memchr
Subclause [cstring.syn] describes the changes.
Header <cwchar> ([cwchar.syn]): The following functions have different declarations:
wcschr
wcspbrk
wcsrchr
wcsstr
wmemchr
Subclause [cwchar.syn] describes the changes.
Header <cstddef> ([cstddef.syn]) declares the name nullptr_t in addition to the names declared in <stddef.h> in the C standard library.