December 2019 - Pharo-users

some sort of mentor help ?
by Roelof Wobben Dec. 3, 2019

Dec. 3, 2019

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Re: [Pharo-users] uFFI: Debugging "External module not found" Error
by Ben Coman Dec. 3, 2019

Dec. 3, 2019

> > > On Dec 3, 2019, at 11:34 AM, Sean P. DeNigris <sean(a)clipperadams.com> > wrote: > > > > Alistair Grant wrote > >> The same message is returned whether the module itself isn't found, or > >> if one of its dependencies can't be found. > Secondary dependencies are awkward to track via command line. > > > > Good to know. I wonder if we can't provide more detailed error messages > > here... > The following turned up in a search (I've no experience with it), but could be useful... https://linux.die.net/man/7/rtld-audit Or perhaps the system can examine the DYNAMIC section of an ELF to pre-load each dependency. >From the image, something in part equivalent to... https://github.com/finixbit/elf-parser/blob/master/elf_parser.cpp GT inspector on an ELF file could an interesting demo ;) btw, I wasn't aware of how "Runtime Search Path: Security" affected the search path... https://amir.rachum.com/blog/2016/09/17/shared-libraries/ > Alistair Grant wrote > >> On linux you can check dependencies with `ldd file.so`, I don't know > >> what the Mac equivalent is. > > > > Apparently, it's `otool -L whatever.dylib`, which returns: > > @rpath/libvlc.dylib (compatibility version 12.0.0, current version > 12.0.0) > > @rpath/libvlccore.dylib (compatibility version 10.0.0, current > version > > 10.0.0) > > /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current > version > > 1252.50.4) > > /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current > version > > 7.0.0) > On Wed, 4 Dec 2019 at 03:58, Todd Blanchard via Pharo-users < pharo-users(a)lists.pharo.org> wrote: > This is the most annoying thing about UFFI - the library search seems to > opaque and I don't understand how it works. > > So far I am finding best practice is to find the library yourself and then > provide the exact file path you want. > > That way, you can actually prompt the user to find it if you don't and > they get a decent experience. > cheers -ben P.S. an interesting side article... https://medium.com/forensicitguy/whitelisting-ld-preload-for-fun-and-no-pro…

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uFFI: Debugging "External module not found" Error
by Sean P. DeNigris Dec. 3, 2019

Dec. 3, 2019

I was trying to get Pharo-LibVLC working on Mac. The following is copied from a GH issue[1]: > I have VLC installed via Homebrew cask, the formula for which simply > installs the dmg. I > first tried supplying a full path to the dylib that the VLC app uses > (/Applications/VLC.app/Contents/MacOS/lib/libvlc.5.dylib), which resulted > in "Error: > External module not found". I then remembered some trouble people have had > in the past > with FFI lookup locations and tried copying into the VM's plugin folder > both a link and the > actual dylib, with the same error. I read the uFFI booklet, but didn't > learn anything more. > > I also checked that the VLC lib was 64-bit via: > > lipo -info .../Pharo.app/Contents/MacOS/Plugins/libvlc.5.dylib > which returned: > Non-fat file: .../Plugins/libvlc.5.dylib is architecture: x86_64 [1] https://github.com/badetitou/Pharo-LibVLC/issues/1 ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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Parsing in VW
by Steffen MÃ¤rcker Dec. 3, 2019

Dec. 3, 2019

Dear all, I have two questions regarding parsing frameworks. 1) Do you have any insights on the performance of SmaCC VS Xtreams Parsing VS PetitParser? 2) Has anybody started to port PetitParser 2 from Pharo to VW? Is it worth the effort? Sorry for cross-posting, I thought this might interest both communities. Cheers, Steffen

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thesis on using ML for Pharo code completion
by Myroslava Romaniuk Dec. 2, 2019

Dec. 2, 2019

Hi everyone I'm starting work on a thesis on using ML for Pharo completion, in particular n-gram language models, and I wrote a little blog post with some details and research questions that I have. Here's a link: https://medium.com/@myroslavarm/using-ml-for-pharo-autocompletion-ideas-80a… . Any feedback or ideas on the topic (and research questions) are most welcome. Best regards, Myroslava

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Porting to Pharo via Ring
by Sean P. DeNigris Dec. 1, 2019

Dec. 1, 2019

Pavel gave an intriguing high-level experience report on porting from VW to Pharo via (among other things) the Ring meta model [1]. Are any more specifics available? It would be valuable to the community to have knowledge of this process freely available. How would someone else actually go about this with another project? Would it help porting from one version of Pharo to another? [1] https://www.youtube.com/watch?v=XrOdlwtVfMM&list=PLJ5nSnWzQXi8DPNpy1jCkjE4y… ----- Cheers, Sean -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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