[Bug libstdc++/81413] New: overloaded new and delete might not be called when dynamically linked with libstdc++

[space_sk8er8 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81413

            Bug ID: 81413
           Summary: overloaded new and delete might not be called when
                    dynamically linked with libstdc++
           Product: gcc
           Version: 7.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: space_sk8er8 at hotmail dot com
  Target Milestone: ---

new and delete operator overloading might or might not work when compiled using
different compilers and different c++ standards.

I used the following code to test the compilers.

#include <iostream>

void * operator new(size_t size)
{
    std::cout << "1\n";
    return malloc(size);
}

void operator delete(void * ptr) noexcept
{
    std::cout << "2\n";
    free(ptr);
}

int main(void)
{
    int *n1 = new int;
    delete n1;

    int *n2 = new int[10];
    delete[] n2;
}

Here are the results I got from several compilers I have tested the code on.
mingw-w64 official build - x86_64-7.1.0-release-posix-seh-rt_v5-rev0.7z
c++11
1
2

c++14
1

clang x86_64 - v4.0.0 manually built without patches using the compiler above
c++11 and c++14
1
2

msvc - platform toolset v141 & sdk v10.0.15063.0
/std:c++14 & /std:c++latest
1
2
1
2

All tests are performed on Windows 7. I can't test compilers on GNU/Linux OS
because I don't have any VMs set up.

Apparently, if -static or -static-libstdc++ is specified, it outputs the
intended result.
c++11 and c++14
1
2
1
2

More discussions at
https://sourceforge.net/p/mingw-w64/bugs/634/
and
https://stackoverflow.com/questions/44907098/c-new-and-delete-overloading