octave @7.1.0+graphicsmagick: GraphicsMagick support is missing

[detlevd (Detlev Droege)]

Since the new Octave version 7.1.0 GraphicsMagick is not detected in the configure process and thus not active, leading to error messages on statements like img = imread("image.jpg"); telling

imfinfo: support for Image IO was unavailable or disabled when Octave was built

The +graphicsmagick variant however is active by default and wasn't turned off.

It turns out, that the configuration option paramters did change in 7.1.0. Simply correct the configure.args in the Portfile an it will be found again. --with-magick=GraphicsMagick must now have two plus signs at the end: --with-magick=GraphicsMagick++

[detlevd (Detlev Droege)]

patch for the octave @7.1.0_0 Portfile

[ryandesign (Ryan Carsten Schmidt)]

Thanks for reporting this bug and suggesting the fix. I agree that the fix looks correct. Of course the revision will also need to be increased since the fix changes what gets installed.

I was going to commit this change, but first I tried to build the port and it failed at the destroot phase. Since I don't think it's related I'll file a separate bug about that and leave this bug to the port's maintainer to fix. Or if you tested the fix and got a successful port installation, feel free to submit the fix (including the revision increase) as a pull request.

[detlevd (Detlev Droege)]

I tested the patch and img = imread("image.jpg"); then works just fine. Submitted a pull request, including revision increase. Thanks for your feedback!

[Detlev Droege <droege@…>]

In f0616a0b7c66c68824767f25f980dae8625f1491/macports-ports (master):

octave: octave 7.*'s GraphicsMagick configure option changed

From octave 7.* release notes at ​https://octave.org/NEWS-7.html :
"Octave’s build system no longer appends “++” to the end of the

“magick++” library name (set with the --with-magick= configure flag).
The real name of the “magick++” library (including any potentially
trailing “++”) needs to be set in that option now."

Closes: #65272