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I don't understand why you cannot link to this. It's a shared library with 
exposed functions and that is all you need. So, please tell me what error 
you are seeing and I will solve it for you.

Andy


On Thu, 25 Mar 2021, Brian P Bockelman wrote:

> @bbockelm commented on this pull request.
>
>
>
>> +        close(m_fd);
> +    }
> +}
> +
> +
> +XrdTpcNSSSupport::TempCAGuard::TempCAGuard(int fd, const std::string &fname)
> +    : m_fd(fd), m_fname(fname)
> +    {}
> +
> +
> +XrdTpcNSSSupport::XrdTpcNSSSupport(XrdSysError *err, std::string ca_dir)
> +    : m_log(*err),
> +      m_ca_dir(ca_dir),
> +      m_plugin(err, &g_ver, "Crypto Support", "libXrdCryptossl.so")
> +{
> +    if (!(m_x509_to_file_func = m_plugin.Resolve("XrdCryptosslX509ToFile")) ||
>
> Actually, it appears we cannot link to this - that's why I had to go this direction (trust me, already tried!  It's a pain to load like this and muck around with function pointers).  CMake cowardly refuses to link to a shared module (as opposed to a shared library).
>
> Another option would be to compile + link an extra copy of those functions just for HttpTpc; I don't particularly like that either.
>
> I like the idea of doing a hard fail instead of falling back.  Will work on that.
>
> -- 
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> Reply to this email directly or view it on GitHub:
> https://github.com/xrootd/xrootd/pull/1431#discussion_r602004394


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