[Bug libstdc++/115422] New: Multi-threaded condition_variable app throws when linking as -static on Linux

[Bug libstdc++/115422] New: Multi-threaded condition_variable app throws when linking as -static on Linux

[ilg at livius dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115422

            Bug ID: 115422
           Summary: Multi-threaded condition_variable app throws when
                    linking as -static on Linux
           Product: gcc
           Version: 14.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ilg at livius dot net
  Target Milestone: ---

I have a test that checks C++ threads which synchronise via a
condition_variable.

The test runs fine on Linux/macOS/Windows, in various scenarios, except when I
build it as `-static` on Linux.

```
$ g++ sleepy-threads-cv.cpp -o sleepy-threads-cv -static -g -lpthread
$ ./static-sleepy-threads-cv 4
abcd
$ g++ sleepy-threads-cv.cpp -o static-sleepy-threads-cv -static -g -lpthread
$ ./static-sleepy-threads-cv 4
Segmentation fault
```

On some systems the result is an exception:

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

I encountered the issue while building the xPack GCC 14 binaries, but later
confirmed it on GCC 13 and older. 

The source code is attached.inside 

The problem seems to be the global condition variable and/or mutex; if I move
them inside the `spawnThreads()` function and pass pointers to them to all
threads, the test is functional even with `-static`.

Is there anything wrong with my test, or is this a small bug in libstdc++?

[Bug libstdc++/115422] Multi-threaded condition_variable app throws when linking as -static on Linux

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115422

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.

*** This bug has been marked as a duplicate of bug 115421 ***

[Bug libstdc++/115422] Multi-threaded condition_variable app throws when linking as -static on Linux

[ilg at livius dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115422

Liviu Ionescu <ilg at livius dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #2 from Liviu Ionescu <ilg at livius dot net> ---
Sorry for the noise, bugzilla asked to resubmit the attachment and entered the
duplicate.