[Bug 292933] libcxxrt crash when called from libstdc++

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292933

            Bug ID: 292933
           Summary: libcxxrt crash when called from libstdc++
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: arrowd@FreeBSD.org

Reproduction steps:

1. Put

USE_GCC=yes

and optionally

WITH_DEBUG=yes

into /usr/ports/devel/libabigail/Makefile

2. poudriere testport -j 16current -ci devel/libabigail
3. Once the build finishes run

lldb -- /usr/local/bin/abidiff --no-default-suppression
/wrkdirs/usr/ports/devel/libabigail/work/libabigail-2.9/tests/data/test-diff-filter/test-PR27995.abi
/wrkdirs/usr/ports/devel/libabigail/work/libabigail-2.9/tests/data/test-diff-filter/test-PR27995.abi

The backtrace:

* thread #1, name = 'abidiff', stop reason = signal SIGSEGV: invalid
permissions for mapped object (fault address: 0x83323acb8)
    frame #0: 0x000000083323acb8 libcxxrt.so.1`vtable for
__cxxabiv1::__si_class_type_info + 16
libcxxrt.so.1`vtable for __cxxabiv1::__si_class_type_info:
->  0x83323acb8 <+16>: andb   %ch, (%rbx,%rbp,2)
    0x83323acbb <+19>: subb   (%rax), %cl
    0x83323acbd <+21>: addb   %al, (%rax)
    0x83323acbf <+23>: addb   %al, 0x2c(%rax)
(lldb) bt
* thread #1, name = 'abidiff', stop reason = signal SIGSEGV: invalid
permissions for mapped object (fault address: 0x83323acb8)
  * frame #0: 0x000000083323acb8 libcxxrt.so.1`vtable for
__cxxabiv1::__si_class_type_info + 16
    frame #1: 0x000000082a6af613 libstdc++.so.6`__dynamic_cast + 131
    frame #2: 0x000000082503c74a
libabigail.so.8`abigail::ir::type_or_decl_base::runtime_type_instance(this=0x00003ca64afb6968,
i=0x00003ca64afb6940) at abg-ir.cc:4155:22
    frame #3: 0x000000082504c764
libabigail.so.8`abigail::ir::global_scope::global_scope(this=0x00003ca64afb6940,
tu=0x00003ca64b1ace80) at abg-ir.cc:8533:24
    frame #4: 0x00000008250344b5
libabigail.so.8`abigail::ir::translation_unit::get_global_scope(this=0x00003ca64b1ace80)
at abg-ir.cc:1237:55
    frame #5: 0x000000082526aa06
libabigail.so.8`abigail::abixml::read_translation_unit(iface=0x00003ca639449000,
tu=0x00003ca64b1ace80, node=0x00003ca63aeebc80) at abg-reader.cc:1879:36
    frame #6: 0x000000082526b045
libabigail.so.8`abigail::abixml::get_or_read_and_add_translation_unit(rdr=0x00003ca639449000,
node=0x00003ca63aeebc80) at abg-reader.cc:1937:28
    frame #7: 0x000000082526b40d
libabigail.so.8`abigail::abixml::read_translation_unit_from_input(iface=0x00003ca639449000)
at abg-reader.cc:1996:44
    frame #8: 0x000000082528d0d1
libabigail.so.8`abigail::abixml::reader::read_corpus(this=0x00003ca639449000,
status=0x0000000820f503b0) at abg-reader.cc:1321:44
    frame #9: 0x000000082526c8e5
libabigail.so.8`abigail::abixml::read_corpus_group_from_input(iface=0x00003ca639449000)
at abg-reader.cc:2428:33
    frame #10: 0x0000000000411817 abidiff`main(argc=4, argv=0x0000000820f509d8)
at abidiff.cc:1450:47
    frame #11: 0x000000082cd1d19f libc.so.7`__libc_start1(argc=4,
argv=0x0000000820f509d8, env=0x0000000820f50a00, cleanup=<unavailable>,
mainX=(abidiff`main at abidiff.cc:1286:1)) at libc_start1.c:180:7
    frame #12: 0x000000000040b014 abidiff`_start at crt1_s.S:80


Note that the crash can't be reproduced on 15.0-RELEASE.

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