Why Does My Multithreaded C Code Fail to Compile with g ?

Compiling Multithread Code with g

Despite having the necessary flags (-pthread -std=c 11), your code fails to compile with g , resulting in the error: "Enable multithreading to use std::thread: Operation not permitted."

Resolving the Issue

The underlying issue stems from a bug in gcc. To circumvent this problem, you can apply the following workaround:

<code class="bash">g++ main.cpp -o main.out -pthread -std=c++11 -Wl,--no-as-needed</code>

Understanding the Workaround

The -Wl,--no-as-needed flag instructs the linker to omit the dynamic loading of the threading library. By default, the linker includes the threading library as part of the compiled program, but this process can fail under certain conditions.

Alternative Compiler: clang

As an alternative to modifying the g command line, you can also use a different C compiler such as clang . The following command will compile your code successfully:

<code class="bash">clang++ main.cpp -o main.out -std=c++11</code>

Conclusion

By using the -Wl,--no-as-needed workaround or opting for an alternative compiler like clang , you can overcome the multithreading compilation issue encountered with g .

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