android: set up cmake

src/android/app/CMakeLists.txt

@@ -1,6 +1,10 @@
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.8)
 
-# TODO: actually add files to compile
+add_library(citra-android STATIC
+            src/main/cpp/dummy.cpp
+            )
 
 # find Android's log library
 find_library(log-lib log)
+
+target_link_libraries(citra-android ${log-lib} core common inih)

src/android/app/build.gradle

@@ -56,21 +56,20 @@ android {
     externalNativeBuild {
         cmake {
             version getCmakeVersion()
-            path "CMakeLists.txt"
+            path "../../../CMakeLists.txt"
         }
     }
 
     defaultConfig {
         externalNativeBuild {
             cmake {
-                cppFlags "-std=c++17"
                 arguments "-DENABLE_QT=0", // Don't use QT
                         "-DENABLE_SDL2=0", // Don't use SDL
                         "-DANDROID_ARM_NEON=true", // cryptopp requires Neon to work
-                        "-DENABLE_CUBEB=0"
+                        "-DENABLE_CUBEB=0",
                         "-DANDROID_STL=c++_shared"
 
-                abiFilters "arm64-v8a", "x86_64"
+                abiFilters "arm64-v8a"
             }
         }
     }

src/android/app/src/main/cpp/dummy.cpp

@@ -0,0 +1,3 @@
+int dummy(int a, int b) {
+    return a + b;
+}