How to use this?

[vadi2]

It's not immediately obvious how to actually use this in conjunction with linuxdeployqt.AppImage to make an AppImage that works with a newer libstdc++ version.

[darealshinji]

Inside the AppDir create a directory usr/optional/libstdc++ and place the libstdc++.so.6 library inside. Then replace the AppRun binary with the patched one from the release section.

If you used gcc compiled from source you'll have to add the stdc++ library from that compiler version.

I should probably add a better description on how to do that.

[darealshinji]

By the way if you want to build an AppImage using a .yml file here's an example on how to make use of the patched AppRun binary:

app: Aegisub

ingredients:
  packages:
    #- aegisub-l10n  # localisation doesn't work (requires patching the source)
  dist: stable
  sources:
    - deb http://ftp.debian.org/debian/ stable main universe

script:
  - DEB=libstdc++6_6.3.0-18_amd64.deb
  - wget -O ../$DEB -c "http://ftp.debian.org/debian/pool/main/g/gcc-6/$DEB"
  - dpkg-deb -x ../$DEB .
  - mkdir -p ./usr/optional/libstdc++
  - mv ./usr/lib/x86_64-linux-gnu/libstdc++.so.6* ./usr/optional/libstdc++
  - find ./usr -name libstdc++.so.6*-gdb.py -delete
  - rm -rf ./AppRun ./usr/lib/x86_64-linux-gnu/x264-10bit
  - wget -O AppRun "https://github.com/darealshinji/AppImageKit-checkrt/releases/download/continuous/AppRun-patched-x86_64"
  - chmod a+x AppRun

[probonopd]

I think it would still be useful for people to see a real-world example on how to use this, e.g., with linuxdeployqt, in the README.md.

Here is an example where I am using it:

https://github.com/probonopd/audacity/blob/AppImage/.travis.yml

The key lines are:

  - # Workaround to increase compatibility with older systems; see https://github.com/darealshinji/AppImageKit-checkrt for details
  - mkdir -p appdir/usr/optional/ ; wget -c https://github.com/darealshinji/AppImageKit-checkrt/releases/download/continuous/exec-x86_64.so -O ./appdir/usr/optional/exec.so
  - mkdir -p appdir/usr/optional/libstdc++/ ; cp /usr/lib/x86_64-linux-gnu/libstdc++.so.6 ./appdir/usr/optional/libstdc++/
 - ( cd appdir ; rm AppRun ; wget -c https://github.com/darealshinji/AppImageKit-checkrt/releases/download/continuous/AppRun-patched-x86_64 -O AppRun ; chmod a+x AppRun)
...
  - # Manually invoke appimagetool so that libstdc++ gets bundled and the modified AppRun stays intact
  - ./linuxdeployqt*.AppImage --appimage-extract
  - export PATH=$(readlink -f ./squashfs-root/usr/bin):$PATH
  - ./squashfs-root/usr/bin/appimagetool -g ./appdir/ $NAME-$VERSION-x86_64.AppImage

[darealshinji]

Thanks for the example. I'm looking forward to update the README.md in the next time. However, a pull request is always welcome. ;-)

[probonopd]

Thanks to probonopd/linuxdeployqt@600fc20

it is no longer needed to extract the linuxdeployqt AppImage since it is no longer replacing a pre-existing AppRun file. So we can shorten the procedure to:

  # ./linuxdeployqt-continuous-x86_64.AppImage appdir/usr/share/applications/*.desktop -bundle-non-qt-libs
  - mkdir -p appdir/usr/optional/ ; wget -c https://github.com/darealshinji/AppImageKit-checkrt/releases/download/continuous/exec-x86_64.so -O ./appdir/usr/optional/exec.so
  - mkdir -p appdir/usr/optional/libstdc++/ ; cp /usr/lib/x86_64-linux-gnu/libstdc++.so.6 ./appdir/usr/optional/libstdc++/
  - ( cd appdir ; rm AppRun ; wget -c https://github.com/darealshinji/AppImageKit-checkrt/releases/download/continuous/AppRun-patched-x86_64 -O AppRun ; chmod a+x AppRun)
  - ./linuxdeployqt-continuous-x86_64.AppImage appdir/usr/share/applications/*.desktop -appimage