https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80649
Bug ID: 80649
Summary: value-initialization rather than
default-initialization at some optimization levels
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: john.duncan at oracle dot com
CC: webrown.cpp at gmail dot com
Target Milestone: ---
CC: webrown.cpp at gmail dot com
This problem concerns a placement-new statement within a loop:
new (ptr.p) TestRecord;
In this case "new TestRecord" without any parentheses or braces should perform
default-initialization. My experience with gcc 6.3 shows default-initialization
at some -O levels, but apparent value-initialization at other levels. In the
example submitted here in the bug report, the problem appears at -O1 but not at
-O2. In the actual large codebase where I first observed the problem, it was
seen at -O2 but not at -O1.
