LTTng logger (CTF)

This commit introduces LTTng logging mechanism which is an open source
tracing tool.

URL: https://lttng.org/

CMakeLists.txt

@@ -284,6 +284,7 @@ add_boolean_option(DEBUG_ASN1 False "Enable ASN1 debug logs" OFF)
 # see common/utils/config.h
 add_boolean_option(TRACE_ASN1C_ENC_DEC OFF "Enable ASN1 encoder/decoder debug traces via OAI logging system" ON)
 add_boolean_option(T_TRACER            True  "Activate the T tracer, a debugging/monitoring framework" ON)
+add_boolean_option(ENABLE_LTTNG        False "Activate the LTTNG tracer, a debugging/monitoring framework" ON)
 add_boolean_option(UE_AUTOTEST_TRACE   False "Activate UE autotest specific logs" ON)
 add_boolean_option(UE_DEBUG_TRACE      False "Activate UE debug trace" ON)
 add_boolean_option(UE_TIMING_TRACE     False "Activate UE timing trace" ON)
@@ -659,6 +660,14 @@ add_library(UTIL
   ${OPENAIR_DIR}/common/utils/time_meas.c
   ${OPENAIR_DIR}/common/utils/time_stat.c
 )
+if (ENABLE_LTTNG)
+  find_package(LTTngUST 2.3.8 EXACT REQUIRED)
+  target_sources(UTIL PRIVATE common/utils/LOG/lttng-tp.c)
+  target_link_libraries(UTIL PUBLIC lttng-ust)
+else()
+  message(STATUS "LTTNG support disabled")
+endif()
+
 pkg_check_modules(cap libcap)
 if (cap_FOUND)
   # see system.c for more info