https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284953
Bug ID: 284953
Summary: typeid() returns mangled string that can't be
demangled
Product: Base System
Version: 14.2-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: y...@freebsd.org
How to reproduce:
1. install the proxsuite package:
> $ cd /usr/ports/math/proxsuite && make install clean
2. install the nanobind and eigen packages:
> $ sudo pkg install nanobind eigen
3. compile the attached testcase.cpp:
> $ c++ testcase.cpp -std=c++20 -I /usr/local/include -I
> /usr/local/include/eigen3 -Wno-missing-template-arg-list-after-template-kw
4. run it
> $ ./a.out
It prints this:
$ ./a.out
> name(mangled)=N9proxsuite6linalg3veg3VecIbNS1_3mem11SystemAllocELNS3_13DtorAvailableE2ELNS3_13CopyAvailableE2EEE
> name(demangled)=(null)
Problems:
1. abi::__cxa_demangle fails to demangle this name and returns nullptr.
2. c++filt also fails to demangle this name and prints the same string instead
of printing the C++ object description.
Either the mangled name is wrong in some way, or demangling procedures fail to
demangle this valid mangled string.
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