http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59267
Bug ID: 59267
Summary: gcc 4.8.2 optimizes code with side-effects away
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: troomps01 at gmail dot com
Created attachment 31285
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31285&action=edit
A very simple C++ program and Makefile that compiles without warning, but also
optimizes out some necessary code.
G++ version:
g++ (GCC) 4.8.2 20131017 (Red Hat 4.8.2-1)
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
OS: Linux
Distro: Fedora 19
Here's the fun: I don't have any optimization turned on in the compile line.
What the attached zip contains:
main.cpp
-- A simple C++ program that shows how stringstreams are optimized out during
compilation
Makefile
-- A makefile that has all of the flags I am using in another project where I
originally encountered the problem.
It is worth noting, that even if you don't have _any_ of the flags I provided
in the Makefile, the code is still optimized away. In fact, you could reduce
the Makefile to this "g++ -o main main.cpp" and the problem persists.
