Re: [PATCH] Don't compile non-OPENSSL code when using OPENSSL and vice versa

[Andreas Ericsson <ae () op5 se>]

Kris Katterjohn wrote:
> This prevents some non-OpenSSL code from being compiled when using OpenSSL and
> vice versa.
>
> Thanks,
> Kris Katterjohn
>
>
> --- service_scan.cc.orig      2006-02-27 15:52:56.000000000 -0600
> +++ service_scan.cc   2006-02-27 15:52:59.000000000 -0600
> @@ -1785,10 +1785,7 @@ static int scanThroughTunnel(nsock_pool 
>      return 0;
>    }
>  
> -#ifndef HAVE_OPENSSL
> -  return 0;
> -#endif
> -
> +#ifdef HAVE_OPENSSL
>    if (svc->tunnel != SERVICE_TUNNEL_NONE) {
>      // Another tunnel type has already been tried.  Let's not go recursive.
>      return 0;
> @@ -1808,6 +1805,9 @@ static int scanThroughTunnel(nsock_pool 
>     svc->resetProbes(true);
>    startNextProbe(nsp, nsi, SG, svc, true);
>    return 1;
> +#else
> +  return 0;
> +#endif
>  }
>  

I'd be surprised if this actually makes the binary smaller. Any sane 
compiler recognizes and removes dead code when it's as obvious as this 
(most do when it's less obvious). In fact, even code like

#define HAVE_OPENSSL 0

if (HAVE_OPENSSL && some_other_condition)
        do_fun_things();

would be left out entirely. If do_fun_things() is static and called only 
from that point (or within blocks like this), it too will be removed.

-- 
Andreas Ericsson                   andreas.ericsson () op5 se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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