Move LTTng check to subdirectory where used

CMakeLists.txt

@@ -609,11 +609,6 @@ add_library(UTIL
   ${OPENAIR_DIR}/common/utils/LOG/vcd_signal_dumper.c
   ${OPENAIR2_DIR}/UTIL/OPT/probe.c
 )
-if (ENABLE_LTTNG)
-  find_package(LTTngUST 2.3.8 EXACT REQUIRED)
-else()
-  message(STATUS "LTTNG support disabled")
-endif()
 
 pkg_check_modules(cap libcap)
 if (cap_FOUND)

common/utils/LOG/CMakeLists.txt

@@ -4,7 +4,10 @@ target_link_libraries(log_headers INTERFACE T_headers)
 
 set(log_sources log.c)
 if (ENABLE_LTTNG)
+  find_package(LTTngUST 2.3.8 EXACT REQUIRED)
   set(log_sources ${log_sources} lttng-tp.c)
+else()
+  message(STATUS "LTTNG support disabled")
 endif()
 add_library(LOG ${log_sources})
 target_include_directories(LOG PUBLIC .)