GCC 11, atomic_bool and linker errors [SOLVED by -latomic]

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Capehill

Posted on: 12/3 19:53 #1

Just can't stay away

I'm trying to compile something like:


// gcc atomic.cpp -Wall -athread=native -std=c++20



#include <atomic>



int main()

{

    std::atomic_bool ab = false;



    ab = true;

    ab.notify_one();



    ab.wait(false);



    return 0;

}

But it gives linker errors. Issue seems to be functionality added in C++20 (wait and notify_one). Wondering if this is some known issue and should I report it somewhere.

Edited by Capehill on 2025/12/4 20:31:41

MickJT

Re: GCC 11, atomic_bool and linker errors

Posted on: 12/4 2:08 #2

Just can't stay away

It compiles if you use

ppc-amigaos-g++ -o atomic atomic.cpp -std=c++20 -athread=native -latomic

or

ppc-amigaos-gcc -o atomic atomic.cpp -std=c++20 -athread=native -latomic -lstdc++

Capehill

Re: GCC 11, atomic_bool and linker errors

Posted on: 12/4 20:31 #3

Just can't stay away

@MickJT

Thanks, works! For some reason -latomic was not required on Linux (gcc13). Maybe there are implementation differences.

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