- **[Babeltrace](https://lttng.org/babeltrace)**: trace viewer.
Enables the use of `lttng view` command.
- Debian/Ubuntu package: `babeltrace`
- - **[LTTng UST](https://lttng.org) (same version as LTTng Tools)**: userspace tracer.
- Enables the tracing of userspace applications.
+ - **[LTTng UST](https://lttng.org) (same minor version as LTTng Tools)**:
+ userspace tracer. Enables the tracing of userspace applications.
- Debian/Ubuntu package: `liblttng-ust-dev`
- **Perl**: needed for `make check` and tests.
- **Python >= 3.0**: needed for `make check` and tests.
(kernel tracing).
- **bash**: needed for running `make check`.
+LTTng-tools supports both the [LTTng Linux Kernel tracer](https://lttng.org)
+and [LTTng user space tracer](https://lttng.org) released as part of the same
+**minor** release series. While some releases do not change the tracer ABIs and
+should work with, no testing is performed to ensure cross-version compatibility
+is maintained.
+
+Note that applications instrumented with older versions of the LTTng UST project
+do not have to be rebuilt or modified to work with the latest LTTng-tools.
+For more information on versioning, please refer to the
+[LTTng documentation](https://lttng.org/docs).
Building
--------
portability. Here are some things you should have on your system in
order to compile the Git repository tree:
- - GNU Autotools (Automake >= 1.10, Autoconf >= 2.50,
+ - GNU Autotools (Automake >= 1.10, Autoconf >= 2.64,
Autoheader >= 2.50; make sure your system-wide `automake` points to
a recent version!)
- [GNU Libtool](http://www.gnu.org/software/autoconf/) >= 2.2
- Flex >= 2.5.35
- Bison >= 2.4
+Optional packages to build LTTng-tools man pages:
+
+ - **AsciiDoc >= 8.4.5** (previous versions may work, but were
+ not tested)
+ - **xmlto >= 0.0.21** (previous versions may work, but were
+ not tested)
+
If you use GNU gold, which is _not_ mandatory, make sure you have this
version: