Github user jablko commented on a diff in the pull request:

    https://github.com/apache/trafficserver/pull/1294#discussion_r94838912
  
    --- Diff: iocore/net/BIO_fastopen.cc ---
    @@ -160,9 +174,24 @@ static const BIO_METHOD fastopen_methods = {
       .destroy       = fastopen_destroy,
       .callback_ctrl = nullptr,
     };
    +#else
    +static BIO_METHOD *fastopen_methods = nullptr;
    +#endif
     
     const BIO_METHOD *
     BIO_s_fastopen()
     {
    +#if OPENSSL_VERSION_NUMBER < 0x10100000L
       return &fastopen_methods;
    +#else
    +  if (!fastopen_methods) {
    +    fastopen_methods = BIO_meth_new(BIO_TYPE_SOCKET, "fastopen");
    +    BIO_meth_set_write(fastopen_methods, fastopen_bwrite);
    +    BIO_meth_set_read(fastopen_methods, fastopen_bread);
    +    BIO_meth_set_ctrl(fastopen_methods, fastopen_ctrl);
    +    BIO_meth_set_create(fastopen_methods, fastopen_create);
    +    BIO_meth_set_destroy(fastopen_methods, fastopen_destroy);
    --- End diff --
    
    Is the following equivalent?
    
    ```C
    #if OPENSSL_VERSION_NUMBER < 0x10100000L
    static const BIO_METHOD fastopen_methods[] = {{
    ...
    }};
    #else
    static const BIO_METHOD *fastopen_methods = [] {
      BIO_METHOD *fastopen_methods = BIO_meth_new(BIO_TYPE_SOCKET, "fastopen");
      ...
      return fastopen_methods;
    }();
    #endif
    
    const BIO_METHOD *
    BIO_s_fastopen()
    {
      return fastopen_methods;
    }


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