Memory leak reported in tests with gcc compilers

[dschlaep]

gcc compilers report a memory leak in our tests; all tested versions of gcc show this, i.e., gcc10, gcc11, and gcc12

Running the leaks command

CXX=g++ make clean test
leaks -quiet -atExit -- bin/sw_test

will report the following leak:

Process 63324: 230 nodes malloced for 115 KB
Process 63324: 1 leak for 16 total leaked bytes.

1 (16 bytes) ROOT LEAK: 0x60000234c000 [16]

Running leaks with the flag MallocStackLogging

MallocStackLogging=1 leaks -quiet -atExit -- bin/sw_test

provides additional information:

Process 63514: 233 nodes malloced for 115 KB
Process 63514: 1 leak for 16 total leaked bytes.

STACK OF 1 INSTANCE OF 'ROOT LEAK: malloc<16>':
9 dyld 0x1053f50d8 start + 596
8 libdyld.dylib 0x1c1684ec4 dyld4::LibSystemHelpers::getenv(char const*) const + 0
7 libsystem_c.dylib 0x1c1563b74 exit + 44
6 libsystem_c.dylib 0x1c1563dd0 __cxa_finalize_ranges + 464
5 libstdc++.6.dylib 0x1054b67e4 0x1054a4000 + 75748
4 libstdc++.6.dylib 0x1055027e0 std::ostream::flush() + 72
3 libstdc++.6.dylib 0x105502748 std::ostream::sentry::~sentry() + 44
2 libstdc++.6.dylib 0x1054af34c std::uncaught_exception() + 12
1 libstdc++.6.dylib 0x1054af4cc __cxa_get_globals + 52
0 libsystem_malloc.dylib 0x1c14a37bc _malloc_zone_malloc + 272

1 (16 bytes) ROOT LEAK: 0x6000028bc000 [16]

[dschlaep]

This looks very much like the case reported and discussed here on stackoverflow:

this is a bug in certain versions of glibc