[Bug c++/67942] diagnose placement new buffer overflow

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67942

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |msebor at gcc dot 
gnu.org

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
A patch capable of detecting and diagnosing a limited subset of such overflows
will be posted for review shortly.  The output of the patch for the example
program in the Description is as follows:

$ g++ -Wall  u.cpp
u.cpp: In function ‘void f(S*)’:
u.cpp:22:27: warning: placement new constructing a 16-byte object of type ‘S’
in a region of type ‘char [8]’ that is 8 bytes large
     S *t = new (buf) S (*s);