[Bug middle-end/94312] missing -Wreturn-local-addr on returning local address via memchr or memset

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94312

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|missing -Wreturn-local-addr |missing -Wreturn-local-addr
                   |on returning local address  |on returning local address
                   |via memchr                  |via memchr or memset

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Ditto for memset and strpbrk.  The warning should be reviewed for coverage. 
Rather than handling just built-ins a more general and more broadly usable
solution is to add a new function attribute to specify that a function returns
either the same value as one of its arguments (unchanged, such as memset), or a
pointer into the same array as one of its arguments (such as memchr).