dhclient binary size

[Thomas Markwalder]

Matt:

To get a 4.1 size of 500Kb, the executable must be stripped.  The
default bin produced isn't stripped, so you can start there.

Thomas

On 9/30/16 6:23 AM, Bancroft, Matt wrote:
>
> Thomas,
>
>
> Thanks for the suggestion. Your changes reduce the binary size by
> 100Kb. However, the binary went from ~500Kb to 2Mb when updating from
> 4.1-ESV-Rx to 4.3.4, so the 100Kb is not really a significant reduction.
>
> I am compiling for arm if that makes any difference. And the main
> reason for the upgrade is to support all the new dhcpv6 options,
> particularly the –D option introduce in 4.2.
>
> The client is being used in an embedded environment so binary size is
> an important issue.
>
>
> Can you suggest any other way to reduce the binary size?
>
>  
>
> Kind Regards,
>
> Matt Bancroft
>
>  
>
> *From:*dhcp-users [mailto:dhcp-users-bounces at lists.isc.org] *On Behalf
> Of *Thomas Markwalder
> *Sent:* 28 September 2016 15:55
> *To:* dhcp-users at lists.isc.org
> *Subject:* Re: dhclient binary size
>
>  
>
> On 9/28/16 10:23 AM, Bancroft, Matt wrote:
>
>     Hi,
>
>      
>
>     Between 4.1-ESV-R12b1 and 4.3.4 the binary size of the dhclient
>     significantly increased.
>
>      
>
>     I‘ve had a search back through posts and cannot see any discussion
>     about why this is; presumably the DDNS changes?
>
>      
>
>     Is there any way to compile a minimum feature version to maintain
>     a small binary size for the client?
>
>      
>
>     Kind Regards,
>
>     Matt Bancroft
>
>
>
> Hello Matt:
>
> If you do not need the client to support DNS updates, you can compile
> it out.  To do so you need to:
>
> 1. Undefine NSUPDATE (comment it out) in includes/site.
> 2. dhclient_ddns_cb_free(), needs to be wrapped with NSUPDATE
> conditional compilation.
>
> Rebuild.
>
> I  have attached a diff, containing these changes.  The resulting
> client is notably smaller.   Please note that, these changes have
> not been tested and are use-at-your-own-risk.  
>
> Sincerely,
>
> Thomas Markwalder
> ISC Software Engineering
>
>
>
>
>
>
>
>
>
>
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>
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