Fix android x86_64 compilation

Author: zayass

cmake/modules/SwiftSupport.cmake

@@ -12,8 +12,26 @@ function(add_swift_target target)
   set(link_flags)
 
   if("${CMAKE_SYSTEM_NAME}" STREQUAL "Android")
-    if ("${CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN}" STREQUAL "")
-      set(CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN "${CMAKE_ANDROID_NDK}/toolchains/${CMAKE_ANDROID_ARCH_HEADER_TRIPLE}-4.9/prebuilt/linux-x86_64")
+    if("${CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN}" STREQUAL "")
+      if(CMAKE_HOST_SYSTEM_NAME STREQUAL Linux)
+        set(android_host_tag linux-x86_64)
+      elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL Darwin)
+        set(android_host_tag darwin-x86_64)
+      elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL Windows)
+        set(android_host_tag windows-x86_64)
+      endif()
+
+      if(CMAKE_ANDROID_ARCH_ABI STREQUAL armeabi-v7a)
+        set(android_toolchain_root ${CMAKE_ANDROID_ARCH_HEADER_TRIPLE})
+      elseif(CMAKE_ANDROID_ARCH_ABI STREQUAL arm64-v8a)
+        set(android_toolchain_root ${CMAKE_ANDROID_ARCH_HEADER_TRIPLE})
+      elseif(CMAKE_ANDROID_ARCH_ABI STREQUAL x86)
+        set(android_toolchain_root ${CMAKE_ANDROID_ARCH_ABI})
+      elseif(CMAKE_ANDROID_ARCH_ABI STREQUAL x86_64)
+        set(android_toolchain_root ${CMAKE_ANDROID_ARCH_ABI})
+      endif()
+
+      set(CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN "${CMAKE_ANDROID_NDK}/toolchains/${android_toolchain_root}-4.9/prebuilt/${android_host_tag}")
     endif()
 
     list(APPEND compile_flags "-sdk" "${CMAKE_ANDROID_NDK}/platforms/android-${CMAKE_SYSTEM_VERSION}/arch-${CMAKE_ANDROID_ARCH}")