Thanks, David. Also, is there a proposal / design doc for the plugin pkg 
somewhere? I didn't see one in the proposal repo.

On Wednesday, December 14, 2016 at 2:15:32 PM UTC-5, David Crawshaw wrote:
>
> The hash is a SHA1 of the package object data, generated by the 
> linker, cmd/link. The hash is created in the function genhash, and 
> placed in the moduledata in the symtab method. 
>
> Using a hash of the object data means a plugin has to be compiled 
> against exactly the same package as the host binary. 
>
> On Wed, Dec 14, 2016 at 1:54 PM, Ian Lance Taylor <ia...@golang.org 
> <javascript:>> wrote: 
> > [ +crawshaw ] 
> > 
> > On Wed, Dec 14, 2016 at 9:03 AM, David Norton <dgno...@gmail.com 
> <javascript:>> wrote: 
> >> I'm trying to better understand how the runtime checks package versions 
> when 
> >> using the plugin pkg. If there's a mismatch, the following error occurs 
> at 
> >> run time: 
> >> 
> >>> plugin.Open: plugin was built with a different version of package ... 
> >> 
> >> 
> >>  That message originates, in the runtime, here. Where does runtimehash 
> get 
> >> set? Maybe someone could give a brief explanation of how version 
> checking 
> >> works when using the new plugin pkg? 
> >> 
> >> Thanks, 
> >> David 
> >> 
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