Add FindLTTngUST module to find LTTng-UST library

Also detect the library version number.  Provide results as variables
and as an imported target, LTTng::UST.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/Tests/FindLTTngUST/Test/main.c b/Tests/FindLTTngUST/Test/main.c
new file mode 100644
index 0000000..ac775a0
--- /dev/null
+++ b/Tests/FindLTTngUST/Test/main.c
@@ -0,0 +1,31 @@
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <lttng/ust-version.h>
+
+#ifdef CMAKE_LTTNGUST_HAS_TRACEF
+#include <lttng/tracef.h>
+#endif
+
+#ifdef CMAKE_LTTNGUST_HAS_TRACELOG
+#include <lttng/tracelog.h>
+#endif
+
+int main(void)
+{
+  char lttng_version_string[16];
+
+  snprintf(lttng_version_string, 16, "%u.%u.%u", LTTNG_UST_MAJOR_VERSION,
+           LTTNG_UST_MINOR_VERSION, LTTNG_UST_PATCHLEVEL_VERSION);
+  assert(!strcmp(lttng_version_string, CMAKE_EXPECTED_LTTNGUST_VERSION));
+
+#ifdef CMAKE_LTTNGUST_HAS_TRACEF
+  tracef("calling tracef()! %d %s", -23, CMAKE_EXPECTED_LTTNGUST_VERSION);
+#endif
+
+#ifdef CMAKE_LTTNGUST_HAS_TRACELOG
+  tracelog(TRACE_WARNING, "calling tracelog()! %d", 17);
+#endif
+
+  return 0;
+}