https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71306
Bug ID: 71306
Summary: bogus -Wplacement-new with an array element
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
As reported in the following post:
https://gcc.gnu.org/ml/gcc-help/2016-05/msg00113.html
the -Wplacement-new warning introduced in GCC 6.1 issues a false positive on
the following test case. It seems to treat the array element as if it was the
array itself.
$ cat zz.cpp && /build/gcc-6-branch/gcc/xgcc -B /build/gcc-6-branch/gcc -S
-Wall -Wextra zz.cpp
void* operator new (__SIZE_TYPE__, void *p) { return p; }
struct S { char c [32]; } *p [2];
void f ()
{
new (p [0]) S;
}
zz.cpp: In function ‘void f()’:
zz.cpp:7:12: warning: placement new constructing an object of type ‘S’ and size
‘32’ in a region of type ‘S* [2]’ and size ‘16’ [-Wplacement-new=]
new (p [0]) S;
~~~~^
