[Bug c++/83414] New: Successive calls to "new" return the same pointer

["pmsf at ufc dot br" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83414

            Bug ID: 83414
           Summary: Successive calls to "new" return the same pointer
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pmsf at ufc dot br
  Target Milestone: ---

Created attachment 42875
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42875&action=edit
The preprocessed C++ input file (<iostream>, <new> and <fstream> included).

The attached program calls "new" twice and never delete's the pointers
received.
The first call allocates an array of struct's,
and the second call allocates a single struct.
The problem is that both calls return the same pointer!

Here is a sample output of the program,
showing that the two pointers received have the same value:
---------------------------------------
o.v:    0x1395c20
p.node: 0x1395c20
---------------------------------------

Please note that the attached program is a much stripped version of the
original
program with which I had problems. I reduced the program as much as I could,
leading to the attached file, which does not make much sense as a program but
which clearly shows the error.

Detailed data about my environment follow below.

g++ -v:
---------------------------------------
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
5.4.0-6ubuntu1~16.04.5' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-5 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
---------------------------------------

uname -mrsv:
---------------------------------------
Linux 4.4.0-103-generic #126-Ubuntu SMP Mon Dec 4 16:23:28 UTC 2017 x86_64
---------------------------------------

Command line that triggers the bug:
---------------------------------------
g++ -Wall -Wextra -std=c++14 -pedantic test.ii ; ./a.out
---------------------------------------

Compiler output:
---------------------------------------
test.cpp:22:12: warning: unused parameter ‘o’ [-Wunused-parameter]
 Pack F1 (C o)  // Unused parameter: necessary for the error to manifest
itself.
            ^
---------------------------------------