libappimage: add dev output

[SuperSandro2000]

Diff on my Plasma

cairo: -184.0 KiB
fontconfig: -42.0 KiB
freetype: -884.4 KiB
libappimage: -52.8 KiB
librsvg: -235.7 KiB
libx11: -250.5 KiB
libxcb: -2.1 MiB
libxext: -58.9 KiB
libxrender: -35.3 KiB

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.
• Follows the automation/AI policy.

[K900]

The includes should be in $dev, no?

[r-burns]

They should, and normally would be, but it looks like their upstream cmake files don't consistently use CMAKE_INSTALL_INCLUDEDIR, so when we specify that on our end we end up with headers in multiple places. I opened a PR to fix that upstream, but I think this workaround is probably fine for now - the headers all get moved to $dev during the fixup phase anyway.

[r-burns]

LGTM. If you're focused on closure size, you may also want to fix their static/shared libraries - it looks like the package output currently contains static libraries with a _shared suffix (?) and the upstream LIBAPPIMAGE_SHARED_ONLY option doesn't seem to work properly. Maybe AppImageCommunity/libappimage#204 improves the situation, haven't tested it myself.

[r-burns]

Is this still needed after the patch? Also, I haven't tested this, but I suspect the substitution may be a little too aggressive - you don't want to replace $out paths that point to actual $out components, such as the libraries..