Added os/raspberry-pi3

Author: pretyman

os/raspberry-pi3.cmake

@@ -0,0 +1,19 @@
+# Copyright (c) 2017, Alexandre Pretyman
+# All rights reserved.
+
+if(DEFINED POLLY_OS_RASPBERRY_PI3_CMAKE)
+  return()
+else()
+  set(POLLY_OS_RASPBERRY_PI3_CMAKE 1)
+endif()
+
+include(polly_add_cache_flag)
+
+foreach(_flag -mcpu=cortex-a53 -mfpu=neon-fp-armv8)
+  polly_add_cache_flag(CMAKE_C_FLAGS   "${_flag}")
+  polly_add_cache_flag(CMAKE_CXX_FLAGS "${_flag}")
+endforeach()
+
+set(CMAKE_SYSTEM_PROCESSOR "armv7-l" CACHE INTERNAL "")
+set(RASPBERRY_PI 3 CACHE INTERNAL "")
+