Description:

I'm encountering an issue when using exec::get_system_scheduler() in my code. The code compiles successfully when using exec::static_thread_pool, but it fails when using exec::get_system_scheduler().

Code:

void l3_scheduler() {
  stdexec::scheduler auto sch = exec::get_system_scheduler();
  stdexec::sender auto computation =
    stdexec::schedule(sch) | stdexec::then([] {
      fmt::println("Hello, from a different thread");
    });
  stdexec::sync_wait(std::move(computation));
}

The error message is as follows:

"__query_system_context_interface(__uuid const&)", referenced from:
    l3_scheduler() in main.cpp.o
 ld: symbol(s) not found for architecture arm64

The following code works without issues:

exec::static_thread_pool pool(8);
auto sch = pool.get_scheduler();

Environment:

• macOS: M1 MacBook Pro (arm64)

• Ubuntu: x86 architecture

• Compiler: clang++-19

Steps to Reproduce:

1. Use stdexec::scheduler with exec::get_system_scheduler().

2. Attempt to compile the code on macOS M1 or Ubuntu (x86).

3. Observe the linker error.