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>

2 files changed, 49 insertions, 0 deletions

diff --git a/Tests/FindLTTngUST/Test/CMakeLists.txt b/Tests/FindLTTngUST/Test/CMakeLists.txt
new file mode 100644
index 0000000..e5bd9f3
--- /dev/null
+++ b/Tests/FindLTTngUST/Test/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.5)
+project(TestFindLTTngUST C)
+include(CTest)
+
+find_package(LTTngUST REQUIRED)
+
+add_definitions(-DCMAKE_EXPECTED_LTTNGUST_VERSION="${LTTNGUST_VERSION_STRING}")
+add_definitions(-DCMAKE_LTTNGUST_HAS_TRACEF="${LTTNGUST_HAS_TRACEF}")
+add_definitions(-DCMAKE_LTTNGUST_HAS_TRACELOG="${LTTNGUST_HAS_TRACELOG}")
+
+add_executable(test_tgt main.c)
+target_link_libraries(test_tgt LTTng::UST)
+add_test(NAME test_tgt COMMAND test_tgt)
+
+add_executable(test_var main.c)
+target_include_directories(test_var PRIVATE ${LTTNGUST_INCLUDE_DIRS})
+target_link_libraries(test_var PRIVATE ${LTTNGUST_LIBRARIES})
+add_test(NAME test_var COMMAND test_var)
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;
+}