boost speed via flag -Ofast and enable openMp

Author: Daniil Tcelikin

android/app/src/main/cpp/CMakeLists.txt

@@ -1,7 +1,6 @@
 # For more information about using CMake with Android Studio, read the
 # documentation: https://d.android.com/studio/projects/add-native-code.html.
 # For more examples on how to use CMake, see https://github.com/android/ndk-samples.
-
 # Sets the minimum CMake version required for this project.
 cmake_minimum_required(VERSION 3.22.1)
 
@@ -24,6 +23,12 @@ project("inference")
 # System.loadLibrary() and pass the name of the library defined here;
 # for GameActivity/NativeActivity derived applications, the same library name must be
 # used in the AndroidManifest.xml file.
+
+set(OPTIMIZATION_FLAGS
+        -Ofast
+        -fopenmp
+        )
+
 add_library(${CMAKE_PROJECT_NAME} SHARED
         # List C/C++ source files with relative paths to this CMakeLists.txt.
         inference.c
@@ -35,4 +40,7 @@ add_library(${CMAKE_PROJECT_NAME} SHARED
 target_link_libraries(${CMAKE_PROJECT_NAME}
         # List libraries link to the target library
         android
-        log)
+        log
+        -fopenmp -static-openmp)
+
+target_compile_options(${PROJECT_NAME} PUBLIC $<$<COMPILE_LANGUAGE:C>:${OPTIMIZATION_FLAGS}>)