pthread error caused by libstdc++ 10.5 on Ubuntu 20.04 (glibc <2.34) <wide error ! when app don`t reply pthread but shared lib reply pthread>

[WikiLiu]

Summary

1. This issue arises after upgrading libstdc++ from version 10.3 to 10.5.
2. In version 10.5, a new check was introduced:

if (!__gthread_active_p())
{
    throw system_error(make_error_code(errc::operation_not_permitted),
                       "Enable multithreading to use std::thread");
}

If libstdc++ is loaded before libpthread, this check fails and triggers the error.
3. glmark2 uses libstdc++ but does not directly link against pthread, which leads to the issue.
4. In glibc 2.34, new functionality eliminates the need to explicitly link against -lpthread, which avoids this problem. However, Ubuntu 20.04 uses glibc 2.31, where this issue still exists.

Steps to reproduce the behavior

Running program not link pthread But so need pthread on Ubuntu 20.04 results in the following error:

terminate called after throwing an instance of 'std::system_error'
  what():  Enable multithreading to use std::thread: Operation not permitted
Aborted

Expected behavior

The program does not need pthread, but the dynamic library needs pthread and it can still work.
Alternatively, update the glibc version in Ubuntu 20.04 to 2.34 or later.

Browser/device details

x86-64-pc

Reported from

https://ubuntu.com/blog/tag/20-04-lts