"Failed to open portfile from registry" while reinstalling because of configure.optflags

[Ryan Schmidt]

> On Oct 25, 2016, at 5:04 PM, Clemens Lang <cal at macports.org> wrote:
> 
> Hi,
> 
> On Tue, Oct 25, 2016 at 08:34:31AM -0500, Ryan Schmidt wrote:
>> I don't know the answers to your questions, but I wanted to mention
>> that I also have noticed the "Failed to open portfile from registry"
>> error far more often than seems normal to me. ("Never" would seem
>> normal to me.)
> 
> Interesting. The last time I've seen any of these messages is for the
> last GHC upgrade, and they were indeed expected and could not be avoided
> there.
> 
> On Tue, Oct 25, 2016 at 07:17:23PM +0200, René J.V. Bertin wrote:
>> Yes, never would seem normal, esp. if the Portfile is there when you
>> check :)
> 
> When a port is opened from registry, it does not use the state of the
> Portfile that you currently have in your ports tree. It uses the state
> of the Portfile as it was when you installed the port. This also applies
> to PortGroups.
> 
> As such, Portfiles or PortGroups that haven't been written carefully can
> trigger this warning from time to time. A common problem is checking for
> the presence of a file, or running a tool, and not catching the errors.

Ah. So the error message is just wrong? There isn't actually a problem opening the portfile from the registry; there's a problem running the portfile that was successfully opened and read?