Specify linker for Android armv7 target.

Author: gonzalolarralde

CMakeLists.txt

@@ -800,6 +800,21 @@ endif()
 # Should we cross-compile the standard library for Android?
 is_sdk_requested(ANDROID swift_build_android)
 if(swift_build_android AND NOT "${SWIFT_ANDROID_NDK_PATH}" STREQUAL "")
+  # Get the prebuilt suffix to create the correct toolchain path when using the NDK
+  if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
+    set(_swift_android_prebuilt_suffix "darwin-x86_64")
+  elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
+    set(_swift_android_prebuilt_suffix "linux-x86_64")
+  endif()
+
+  set(SWIFT_ANDROID_PREBUILT_PATH
+      "${SWIFT_ANDROID_NDK_PATH}/toolchains/arm-linux-androideabi-${SWIFT_ANDROID_NDK_GCC_VERSION}/prebuilt/${_swift_android_prebuilt_suffix}")
+  
+  # Resolve the correct linker based on the file name of CMAKE_LINKER (being 'ld' or 'ld.gold' the options)
+  get_filename_component(SWIFT_ANDROID_LINKER_NAME "${CMAKE_LINKER}" NAME)
+  set(SWIFT_SDK_ANDROID_ARCH_armv7_LINKER 
+      "${SWIFT_ANDROID_NDK_PATH}/toolchains/arm-linux-androideabi-${SWIFT_ANDROID_NDK_GCC_VERSION}/prebuilt/${_swift_android_prebuilt_suffix}/bin/arm-linux-androideabi-${SWIFT_ANDROID_LINKER_NAME}")
+
   configure_sdk_unix(ANDROID "Android" "android" "android" "armv7" "armv7-none-linux-androideabi" "${SWIFT_ANDROID_SDK_PATH}")
 
   if (NOT ("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin" OR "${CMAKE_SYSTEM_NAME}" STREQUAL "Linux"))
@@ -809,14 +824,6 @@ if(swift_build_android AND NOT "${SWIFT_ANDROID_NDK_PATH}" STREQUAL "")
     set(SWIFT_PRIMARY_VARIANT_SDK_default "ANDROID")
     set(SWIFT_PRIMARY_VARIANT_ARCH_default "armv7")
   endif()
-
-  if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
-    set(_swift_android_prebuilt_suffix "darwin-x86_64")
-  elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
-    set(_swift_android_prebuilt_suffix "linux-x86_64")
-  endif()
-  set(SWIFT_ANDROID_PREBUILT_PATH
-      "${SWIFT_ANDROID_NDK_PATH}/toolchains/arm-linux-androideabi-${SWIFT_ANDROID_NDK_GCC_VERSION}/prebuilt/${_swift_android_prebuilt_suffix}")
 endif()
 
 # Should we cross-compile the standard library for Windows?