At the moment wildmidi plug-in is broken:

dlopen error: /nix/store/ad41yrj56xm27mzhzlkgmxks1z2g3y7s-deadbeef-with-plugins-1.8.0/lib/deadbeef/wildmidi.so: undefined symbol: X
trying /nix/store/ad41yrj56xm27mzhzlkgmxks1z2g3y7s-deadbeef-with-plugins-1.8.0/lib/deadbeef/wildmidi.fallback.so...
plugin wildmidi.so not found or failed to load

This also failed in the previous version, but it never showed a dialog box for this:

dlopen error: /nix/store/nxp9nlqs9d0x79yx3s08n87z61jxdgsx-deadbeef-0.7.2/lib/deadbeef/wildmidi.so: undefined symbol: X
trying /nix/store/nxp9nlqs9d0x79yx3s08n87z61jxdgsx-deadbeef-0.7.2/lib/deadbeef/wildmidi.fallback.so...
plugin not found or failed to load

Replacing our wildmidi.so with wildmidi.so from upstream fixed it.

So did the one built using the following command in nix-shell -A deadbeef:

unpackPhase
cd source
cd plugins/wildmidi
gcc -shared -Iinclude -DWILDMIDI_VERSION=\"0.2.2\" -DWILDMIDILIB_VERSION=\"0.2.2\" -DTIMIDITY_CFG=\"/etc/timidity.conf\" -fPIC wildmidiplug.c src/wildmidi_lib.c include/wildmidi_lib.h -o wildmidi.so -lm

If we build deadbeef with debugging info using nix-build -E 'with import <nixpkgs> {}; enableDebugging deadbeef' where the symbol comes from:

$ nm -A -D -l result/lib/deadbeef/wildmidi.so
result/lib/deadbeef/wildmidi.so:0000000000018080 B X	/build/source/plugins/wildmidi/src/wildmidi_lib.c:399

Apparently, it is from this global variable:

https://github.com/DeaDBeeF-Player/deadbeef/blob/7ac83fb204fc3c8a35486ef8f9550cd98cec674e/plugins/wildmidi/src/wildmidi_lib.c#L399

But its name is b, not X.

I tried hardeningDisable = ["all"]; but that did not help. What else could be renaming the symbol?

The installPhase seemed to be messing things up. Using dontPatchELF = true; resolves the issue for me. With that the warning did not show up. Not sure what consequences this has for the other elf-files.

EDIT: Ah, didn't notice you pushed a new version. Your patch is much cleaner than using dontPatchELF!

Confirmed to be working with the patch. 👍 Thank you!

I can reproduce it with nix run -f . patchelfUnstable -c patchelf --shrink-rpath wildmidi.so. Will open an issue with patchelf.