graphviz +poppler +r +rsvg on macOS 13.0.01 fails: clang: error: unsupported option '-fopenmp'

[captainproton1971 (Captain Proton)]

Log attached, but the salient point is (I think) :info:build clang: error: unsupported option '-fopenmp'

Seems to be related to (fixed) issue ​https://trac.macports.org/ticket/61327.

I'll try a similar fix (compiler blacklist) and report back.

[captainproton1971 (Captain Proton)]

logfile

[captainproton1971 (Captain Proton)]

I can confirm that adding compiler.openmp_version 4.0 to the Portfile results in a completed build (although it does give the following warnings that I think are likely unrelated):

Warning: violation by /Library/Python                    
Warning: graphviz violates the layout of the ports-filesystems!
Warning: Please fix or indicate this misbehavior (if it is intended), it will be an error in future releases!

[kencu (Ken)]

because there is at present no accepted mechanism for ports to indicate to other ports that they need or support openmp generally, MacPorts has usually been switching it off.

this could be fixed quite easily using the variant mechanism, much like x11/quartz, but nobody has done the legwork on it yet.

Many have asked, going back 5-7 years at least, for this.

For now, we stumble across these accidental uses of fopenmp from time to time.

[kencu (Ken)]

if you want to take the lead on this worthy project, you could start a thread abt it on the dev mailing list…you’ll get lots of support, and people will raise a few concerns, but it should be done someday