contents/using-lttng/instrumenting/advanced-techniques/32-bit-on-64-bit/building-instrumented-32-bit-c-application.md

   1 ---
   2 id: building-instrumented-32-bit-c-application
   3 ---
   4
   5 Let us reuse the _Hello world_ example of
   6 [Tracing your own user application](#doc-tracing-your-own-user-application)
   7 ([Getting started](#doc-getting-started) chapter).
   8
   9 The instrumentation process is unaltered.
  10
  11 First, a typical 64-bit build (assuming you're running a 64-bit system):
  12
  13 <pre class="term">
  14 gcc -o hello64 -I. hello.c hello-tp.c -ldl -llttng-ust
  15 </pre>
  16
  17 Now, a 32-bit build:
  18
  19 <pre class="term">
  20 gcc -o hello32 -I. <strong>-m32</strong> hello.c hello-tp.c <strong>-L/usr/lib32</strong> \
  21     -ldl -llttng-ust <strong>-Wl,-rpath,/usr/lib32</strong>
  22 </pre>
  23
  24 The `-rpath` option, passed to the linker, will make the dynamic loader
  25 check for libraries in `/usr/lib32` before looking in its default paths,
  26 where it should find the 32-bit version of `liblttng-ust`.