Do not use - the real upstream is Subsurface-divelog/subsurface
Pull request Compare This branch is 332 commits behind Subsurface-divelog:master.
torvalds and dirkhh Fix warning about unused variables
Commit 810903b ("Import: pass a dive table to process_imported_dives()")
introduced the variables

        struct dive *old_dive, *merged;

into process_imported_dives(), but never used them.  It seems to be an
artifact of having split the function to use the try_to_merge_into()
helper function (that has those same variable names and _does_ use
them), but forgetting the original variables from the pre-split case.

Gcc understandably warns about it:

  core/divelist.c: In function ‘process_imported_dives’:
  core/divelist.c:1351:26: warning: unused variable ‘merged’ [-Wunused-variable]
    struct dive *old_dive, *merged;
  core/divelist.c:1351:15: warning: unused variable ‘old_dive’ [-Wunused-variable]
    struct dive *old_dive, *merged;

and the trivial fix is to just remove that line that declares the stale
and unused variables.

Signed-off-by: Linus Torvalds <>
Latest commit d2d9821 Oct 7, 2018
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.github release-notes: use Nov 29, 2017
.tx Add simple glossary Dec 29, 2013
Documentation user manual: update bundled HTML of Spanish translation Sep 28, 2018
ReleaseNotes Update README and ReleaseNotes for 4.8.3 / 2.1.4 Sep 28, 2018
android-mobile Use hex USB VID/PID Aug 12, 2018
android Use hex USB VID/PID Aug 12, 2018
appdata build-system: don't modify a file under git control Sep 15, 2018
cmake/Modules Update mobile version number Sep 24, 2018
core Fix warning about unused variables Oct 7, 2018
desktop-widgets Statistics: only consider selected dives in HTML export statistics Oct 7, 2018
dives Update DM5 test data Apr 7, 2018
icons Move DC download icons used by mobile app to mobile-widgets/qml/icons/ Aug 7, 2018
libdivecomputer @ e61b7c6 Update libdivecomputer Oct 7, 2018
map-widget map-widget: add support for filtering of map locations Aug 18, 2018
mobile-widgets QML UI: set proper active background color for downloaded dives Oct 7, 2018
packaging MXE: enable building against userspace FTDI drivers again Oct 7, 2018
printing_templates printing: delete `One Dive Simple.html` and cleanup Nov 24, 2017
profile-widget Cleanup: reinstate override modifiers Sep 29, 2018
qt-models Statistics: only consider selected dives in HTML export statistics Oct 7, 2018
scripts Travis: don't upload the MXE Subsurface binaries Oct 7, 2018
smtk-import Optional anonymization upon export Sep 13, 2018
snap [snap] add raw-usb interface Jun 13, 2018
tests Import: pass "downloaded" parameter to process_imported_dives() Oct 7, 2018
theme Reverse html trip list rendering order Aug 13, 2018
translations Update latest translations from Transifex Sep 29, 2018
xslt CSV import: import of last field Oct 7, 2018
.DEREK.yml Derek: enable label and milestone management Jul 13, 2018
.clang-format Reenable ForEachMacros in .clang-format Oct 19, 2015
.gitattributes release-notes: use Nov 29, 2017
.gitignore build-system: don't modify a file under git control Sep 15, 2018
.gitmodules Update references to Subsurface-NG Apr 25, 2018
.mailmap Update mailmap Jul 11, 2018
.travis.yml Travis: add Windows build in a container Oct 7, 2018 update Oct 7, 2018
CMakeLists.txt Revert "Revert "QML UI: newer Kirigami and fallout"" Oct 1, 2018 Add Coding conventions section in CodingStyle file Apr 10, 2018 Update placement of *, & and && declarators Jul 26, 2018
INSTALL Fix typo in INSTALL file. Oct 2, 2018
LICENSE Move license file to LICENSE Sep 21, 2016 Update README and ReleaseNotes for 4.8.3 / 2.1.4 Sep 28, 2018
Readme.testing Fix minor typos and spelling mistakes in and related Apr 9, 2018
Readme.ubuntu update INSTALL and Readme.ubuntu to exclude Marble Sep 4, 2017
SupportedDivecomputers.html Update list of supported dive computers Sep 28, 2018
SupportedDivecomputers.txt Update list of supported dive computers Sep 28, 2018
TODO.CCR Update todo list for CCR Nov 18, 2014
descriptor3.tsv Add structured file with list of supported dive computers Dec 14, 2013
export-html.cpp Statistics: remove global state / calculate only when needed Oct 7, 2018
gpl-2.0.txt Add second copy of the GPL Sep 23, 2016
makefile ssrf: remove LIBRARY_PATH from makefile Jul 6, 2018
qt-installer-noninteractive.qs Update non-interactive qt installation Jul 12, 2018
subsurface-desktop-main.cpp ssrf: call sync() when exiting appl. Aug 15, 2018
subsurface-helper.cpp Ssrf: correct mapWidget registration for desktop version Sep 12, 2018
subsurface-mobile-main.cpp core/settings ... : remove qPref* includes in qPref.h Sep 12, 2018
subsurface.debug Make use of 'coredumpctl dump' in Subsurface.debug helper Oct 20, 2017
subsurface.desktop Fix name to uppercase Nov 5, 2017
subsurface.qrc Dive media: Extract thumbnails from videos with ffmpeg Jul 28, 2018
subsurface_enabled_translations Added missing Qt5 translation files Feb 2, 2017
subsurfacetemplate.tex More details for TeX export Aug 10, 2017
terms Fix minor typos and spelling mistakes in and related Apr 9, 2018

Subsurface Build Status

This is the README file for Subsurface 4.8.3

Please check the ReleaseNotes.txt for details about new features and changes since Subsurface 4.8.2 (and earlier versions).

Subsurface can be found at

Our user forum is at

Report bugs and issues at

License: GPLv2

We frequently make new test versions of Subsurface available at and you always can get the latest builds (with some caveats about installability) at

These tend to contain the latest bug fixes and features, but also occasionally the latest bugs and issues. Please understand when using them that these are primarily intended for testing.

You can get the sources to the latest development version from the git repository:

git clone

You can also fork the repository and browse the sources at the same site, simply using

If you want the latest release (instead of the bleeding edge development version) you can either get this via git or the release tar ball. After cloning run the following command:

git checkout v4.8.3  (or whatever the last release is)

or download a tarball from

Detailed build instructions can be found in the INSTALL file.

System Requirements

On desktop, the integrated Googlemaps feature of Subsurface requires a GPU driver that has support for at least OpenGL 2.1. If your driver does not support that, you may have to run Subsurface in software renderer mode.

Subsurface will automatically attempt to detect this scenario, but in case in doesn't you may have to enable the software renderer manually with the following:

  1. Learn how to set persistent environment variables on your OS
  2. Set the environment variable 'QT_QUICK_BACKEND' with the value of 'software'

Basic Usage

Install and start from the desktop, or you can run it locally from the build directory:

On Linux:

$ ./subsurface

On Mac:

$ open

Native builds on Windows are not really supported (the official Windows installers are both cross-built on Linux).

You can give a data file as command line argument, or (once you have set this up in the Preferences) Subsurface picks a default file for you when started from the desktop or without an argument.

If you have a dive computer supported by libdivecomputer, you can just select "Import from Divecomputer" from the "Import" menu, select which dive computer you have (and where it is connected if you need to), and hit "OK".

The latest list of supported dive computers can be found in the file SupportedDivecomputers.txt.

Much more detailed end user instructions can be found from inside Subsurface by selecting Help (typically F1). When building from source this is also available as Documentation/user-manual.html. The documentation for the latest release is also available on-line


There is a mailing list for developers: Go to to subscribe.

If you want to contribute code, please open a pull request with signed-off commits at (alternatively, you can also send your patches as emails to the developer mailing list).

Either way, if you don't sign off your patches, we will not accept them. This means adding a line that says "Signed-off-by: Name " at the end of each commit, indicating that you wrote the code and have the right to pass it on as an open source patch.


Also, please write good git commit messages. A good commit message looks like this:

Header line: explain the commit in one line (use the imperative)

Body of commit message is a few lines of text, explaining things
in more detail, possibly giving some background about the issue
being fixed, etc etc.

The body of the commit message can be several paragraphs, and
please do proper word-wrap and keep columns shorter than about
74 characters or so. That way "git log" will show things
nicely even when it's indented.

Make sure you explain your solution and why you're doing what you're
doing, as opposed to describing what you're doing. Reviewers and your
future self can read the patch, but might not understand why a
particular solution was implemented.

Reported-by: whoever-reported-it
Signed-off-by: Your Name <>

where that header line really should be meaningful, and really should be just one line. That header line is what is shown by tools like gitk and shortlog, and should summarize the change in one readable line of text, independently of the longer explanation. Please use verbs in the imperative in the commit message, as in "Fix bug that...", "Add file/feature ...", or "Make Subsurface..."

A bit of Subsurface history

In fall of 2011, when a forced lull in kernel development gave him an opportunity to start on a new endeavor, Linus Torvalds decided to tackle his frustration with the lack of decent divelog software on Linux.

Subsurface is the result of the work of him and a team of developers since then. It now supports Linux, Windows and MacOS and allows data import from a large number of dive computers and several existing divelog programs. It provides advanced visualization of the key information provided by a modern dive computer and allows the user to track a wide variety of data about their diving.

In fall of 2012 Dirk Hohndel took over as maintainer of Subsurface.