contents/using-lttng/instrumenting/advanced-techniques/32-bit-on-64-bit/intro.md

   1 ---
   2 id: instrumenting-32-bit-app-on-64-bit-system
   3 ---
   4
   5 In order to trace a 32-bit application running on a 64-bit system,
   6 LTTng must use a dedicated 32-bit
   7 [consumer daemon](#doc-lttng-consumerd). This section discusses how to
   8 build that daemon (which is _not_ part of the default 64-bit LTTng
   9 build) and the LTTng 32-bit tracing libraries, and how to instrument
  10 a 32-bit application in that context.
  11
  12 Make sure you install all 32-bit versions of LTTng dependencies.
  13 Their names can be found in the `README.md` files of each LTTng package
  14 source. How to find and install them depends on your target's
  15 Linux distribution. `gcc-multilib` is a common package name for the
  16 multilib version of GCC, which you also need.
  17
  18 The following packages will be built for 32-bit support on a 64-bit
  19 system: <a href="http://urcu.so/" class="ext">Userspace RCU</a>,
  20 LTTng-UST and LTTng-tools.