Exporting define for layer by layer profiler

Libraries that link the layer_by_layer_profiler interface library will
also get the LAYER_BY_LAYER_PROFILE define appending to the build
arguments. This allows the preprocessor to select which profiler to use.

Change-Id: I85fec66d2dd9949fd7fe395fb44e49bda1539925
diff --git a/applications/inference_process/src/inference_process.cpp b/applications/inference_process/src/inference_process.cpp
index 2a0b687..09439f8 100644
--- a/applications/inference_process/src/inference_process.cpp
+++ b/applications/inference_process/src/inference_process.cpp
@@ -24,7 +24,7 @@
 #include "tensorflow/lite/schema/schema_generated.h"
 
 #include "arm_profiler.hpp"
-#ifdef ETHOSU
+#ifdef LAYER_BY_LAYER_PROFILER
 #include "layer_by_layer_profiler.hpp"
 #endif
 #include "ethosu_log.h"
@@ -204,7 +204,7 @@
 
     // Create the TFL micro interpreter
     tflite::AllOpsResolver resolver;
-#ifdef ETHOSU
+#ifdef LAYER_BY_LAYER_PROFILER
     tflite::LayerByLayerProfiler profiler;
 #else
     tflite::ArmProfiler profiler;
diff --git a/lib/layer_by_layer_profiler/CMakeLists.txt b/lib/layer_by_layer_profiler/CMakeLists.txt
index 7a16da2..1e3d012 100644
--- a/lib/layer_by_layer_profiler/CMakeLists.txt
+++ b/lib/layer_by_layer_profiler/CMakeLists.txt
@@ -21,6 +21,17 @@
 endif()
 
 add_library(layer_by_layer_profiler INTERFACE)
-target_link_libraries(layer_by_layer_profiler INTERFACE ethosu_core_driver tflu event_recorder ethosu_log)
-target_include_directories(layer_by_layer_profiler INTERFACE include)
-target_sources(layer_by_layer_profiler INTERFACE src/layer_by_layer_profiler.cpp)
+
+target_link_libraries(layer_by_layer_profiler INTERFACE
+    ethosu_core_driver
+    tflu event_recorder
+    ethosu_log)
+
+target_include_directories(layer_by_layer_profiler INTERFACE
+    include)
+
+target_sources(layer_by_layer_profiler INTERFACE
+    src/layer_by_layer_profiler.cpp)
+
+target_compile_definitions(layer_by_layer_profiler INTERFACE
+    LAYER_BY_LAYER_PROFILER)