[Bug c++/50594] Option -fwhole-program discards replaced new operator for std::string

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50594

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-03 13:43:21 UTC ---
[basic.stc.dynamic.allocation] p1

"a program is ill-formed if an allocation function is declared in a namespace
scope other than global scope or declared static in global scope."

So using -fwhole-program and not making replacement functions
externally-visible produces an ill-formed program (which G++ should probably
reject)