ReaLearn2 (Linux version, after v2.7.1) does not scan and load

[akademie]

ReaLearn2 (Linux version, after v2.7.1) does not scan and load in Linux

v2.13.0-pre.4 ... does not scan, so does not load
v2.12.0 ........... does not scan, so does not load
v2.8.0-rc.6 ...... does not scan, so does not load
v2.8.0-pre1 ..... does not scan, so does not load
---
v2.7.1 .......... does load properly ! (this is last working version)
v2.7.0 .......... does load properly !
v2.5.0 .......... does load properly !
v2.0.1 .......... does load properly !
---
v1.10.0 ......... does load properly !

"realearn-linux-x86_64.so" file is always placed in "/UserPlugins/FX/VST" path.
Linux distro is PuppyLinux (64bit) bionicpup64 8.0, Window Manager: JWM v2.3.7
Reaper v6.58+dev0520 (Linux, 64bit)

EDIT20220522: Added another working version ( v2.0.1) to the post.

[Hanswurst]

Hi, Reaper 6.58 on ArchLinux with XFCE here, just gave v2.12.0 and v2.13.0-pre.4 a try, both load and run fine. Did you already try to clear the VST cache and rescan afterwards?

[akademie]

Originally Posted by Hanswurst

Hi, Reaper 6.58 on ArchLinux with XFCE here, just gave v2.12.0 and v2.13.0-pre.4 a try, both load and run fine. Did you already try to clear the VST cache and rescan afterwards?

Hi Hans,
interesting, thanks for sharing your compatibility experience.

And yes, I did clear/rescan procedure all the time, because I tested all the versions listed in first post to find out in which version happened some change that can have such impact - and it is the v2.8.0-pre1 which is the first version that causes this problem and is unable to scan. (Maybe some added dependency after v2.7.1 ?).

[helgoboss]

This is strange. Nothing substantial happened between 2.7.1 and 2.8.0-pre1 (in terms of dependencies or build tooling). Just checked.

Once I asked Justin if there's a good way to check plug-in loading errors on Linux. He responded that one should run REAPER from a terminal, select the plug-in in Prefs/VST/Re-scan and see what it prints to the terminal.

Anything you see there?

[akademie]

^^^^^ unfortunately there is no info either

root# ./reaper
ALSA: using mmap interleaved
ALSA: using mmap interleaved
root#

[PMan]

Ubuntu 20.10/Wayland, Reaper 6.58

I installed via ReaPack, loads ok.

"Reaper v6.58+dev0520" Maybe try using a non-dev version?

Good luck!

[akademie]

Tried in Linux Mint 18.2 (x64) Sonya, with "Mate 1.18" environment, ReaLearn v2.13.1, Reaper v6.67rc2 linux and still no go

(the same situation as in original post = v2.7.1 is the last version that is able to scan and load).

[Venn]

Just checked the box in the studio. Everything up to 2.12 is working correctly. 2.13 "works" but the configuration window is knackered.

This is on Debian Testing.

Screenshots
https://imgur.com/a/qmqLxMd

[helgoboss]

Originally Posted by Venn

Just checked the box in the studio. Everything up to 2.12 is working correctly. 2.13 "works" but the configuration window is knackered.

This is on Debian Testing.

Screenshots
https://imgur.com/a/qmqLxMd

Oh, this doesn't look too good. How about other ReaLearn for Linux users? Same GUI issues?

[DuX]

I'm using Debian 10 Buster [latest is 11 Bullseye] and it doesn't show up for me, either. However, logic tells me that this might be Reaper's fault since it shows up in Reaper 6.58? Maybe Reaper devs should take a look at it.

[helgoboss]

@akademie @Dux Could you please try this: https://github.com/helgoboss/realear...ent-1320964181

[akademie]

Unfortunately I am getting this error with both latest v2.13.1 (non-working) and v2.5 (working) .SO files

mint@mint /tmp/realearn-test $ gcc -o test test.c
/tmp/ccFI870Z.o: In function `main':
test.c:(.text+0x19): undefined reference to `dlopen'
test.c:(.text+0x1e): undefined reference to `dlerror'
collect2: error: ld returned 1 exit status
mint@mint /tmp/realearn-test $

It's in Linux Mint 18.2 'Sonya' "MATE 64-bit" (as live user).

And I re-checked also in Reaper v6.70 (v2.5 does work while latest one does not).

[akademie]

Well, OK, little bit of googling revealed that it requires to add -ldl at the end of command line

So here it is..

1) with older v2.5 realearn.so file:

mint@mint /tmp/realearn-test $ gcc -o test test.c -ldl
mint@mint /tmp/realearn-test $ ./test
Test
(null)mint@mint /tmp/realearn-test $

2) with latest v 2.13.1 realearn.so file:

mint@mint /tmp/realearn-test $ gcc -o test test.c -ldl
mint@mint /tmp/realearn-test $ ./test
Test
/lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by ./realearn.so)mint@mint /tmp/realearn-test $

[helgoboss]

Originally Posted by akademie

Well, OK, little bit of googling revealed that it requires to add -ldl at the end of command line

So here it is..

1) with older v2.5 realearn.so file:

mint@mint /tmp/realearn-test $ gcc -o test test.c -ldl
mint@mint /tmp/realearn-test $ ./test
Test
(null)mint@mint /tmp/realearn-test $

2) with latest v 2.13.1 realearn.so file:

mint@mint /tmp/realearn-test $ gcc -o test test.c -ldl
mint@mint /tmp/realearn-test $ ./test
Test
/lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by ./realearn.so)mint@mint /tmp/realearn-test $

Cool, thanks for trying this! I don't know yet what to do with that but will think about it, haha. At least now we have the cause.

Here's the GitHub issue: https://github.com/helgoboss/realearn/issues/503

[helgoboss]

@akademie I suppose you can't or don't want to upgrade your Puppy Linux to a newer version that includes glibc 2.29?

Yea, mmh, I would understand. DAW users are mostly hesitant when it comes to system updates ... unfortunately this worrying is often justified I'll see if there's an alternative solution.

[akademie]

It's Bionic Puppy 8.0 x64 (bionicpup64-8.0-uefi.iso) and Linux Mint 18.2 'Sonya' "MATE 64-bit" which I started to use because of good experience (bionic puppy runs completely in RAM and is super fast even on old laptops, also I can re-master for various usage - supercool, I have it always with me for live boot as I use various machines which is also cool).
I still trying new and various other distributions, but the most new = most cpu/ram demanding

I also tried to update glibc while doing this test but found out that it is not possible without upgrade whole distribution. I have to say that I am not experienced linux user.

It would be cool if you could solve that in case that the functions of newer glibc version are not necessary used for running the code actually. Otherwise, if you do take advantage of some of its new functionality (since v2.5 of ReaLearn) then it would not be possible, I understand.

[wholehalf]

Hi all,

I am running Reaper and ReaLearn on three machines, all running Kubuntu 22.04. As stated in the title, Realearn was failing to scan.

While searching for a solution, I compiled and ran the small the small C program on this ReaLearn GitHub thread https://github.com/helgoboss/realearn/issues/503.

The first message It gave was:

./realearn.so: cannot open shared object file: No such file or directory

so I copied the "Test" binary to the folder where ReaLearn is located and copied "ReaLearn-x64.so" to "realearn.so" ("Test" refers to "./realearn.so" in the code).

After running the test program again I got this:

libxdo.so.3: cannot open shared object file: No such file or directory

So I installed libxdo3 via apt. I then scanned for new plugins in REAPER and realearn was found and I could open it on a track.

This is where the weirdness starts: Since the issue was solved, I though I could delete "realearn.so" which I had copied previously. However, after rescanning for new plugins, REAPER failed to load ReaLearn again. Just to check, I removed libxdo3 and copied ReaLearn-x64.so to realearn.so again, to see if simply renaming the file would work. ReaLearn did showed up in the plugin list again, however when I placed it on a track it was in an offline state and I couldn't activate it.

So in summary, what seems to solve the issue for me is installing libxdo3 and renaming ReaLearn-x64.so to realearn.so.

[WelderOriginal]

I can confirm that the plugin does not scan under Reaper v6.65.
Tried with the version 2.14.3, tried to rename the file to "realearn.so", with no luck.

libxdo-dev and libxdo3 are both installed in last version.

No matter how hard I try, ReaLearn does not show up anywhere in my list, even after successful installation.

Any hint ?

EDIT : v2.11.1 works flawlessly.

[PMan]

Running Reaper 6.73, on Ubuntu 22.04.1.
ReaLearn v2.14.3, installed from ReaPack - scans and opens.

I don't use it, just testing to help out.

[helgoboss]

Originally Posted by WelderOriginal

I can confirm that the plugin does not scan under Reaper v6.65.
Tried with the version 2.14.3, tried to rename the file to "realearn.so", with no luck.

libxdo-dev and libxdo3 are both installed in last version.

No matter how hard I try, ReaLearn does not show up anywhere in my list, even after successful installation.

Any hint ?

EDIT : v2.11.1 works flawlessly.

Can you start REAPER in the terminal and see what it says when you rescan the ReaLearn SO file? It should say something, probably some missing function or library. If it doesn't say anything, then at least the following should give some valuable info: https://github.com/helgoboss/realear...ent-1320964181

The issue with Linux is that there are so many distributions and versions. Some bring all necessary libraries, some don't or older versions. I usually test with latest Ubuntu LTS.

[WelderOriginal]

Thanks for the reply ! In my case it was indeed GLIBC not available in version 2.33.

/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by ./realearn.so)

This made me realise I should upgrade to ubuntu 22.04.

[helgoboss]

Originally Posted by WelderOriginal

Thanks for the reply ! In my case it was indeed GLIBC not available in version 2.33.

/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by ./realearn.so)

This made me realise I should upgrade to ubuntu 22.04.

I will think about linking libc statically in future, then this problem wouldn't occur. i need to research about possible side effects though.

[DuX]

In the meantime I upgraded Debian to 11 and now ReaLearn2 works, along with some other plugins. It was probably GCC/GLib version that was too old in Debian 10, indeed.