make RPI option more descriptive

CMakeLists.txt

@@ -9,7 +9,7 @@ option(USE_AVX2 "enable avx2 code" )
 option(USE_NETNS "enable networking namespace support" )
 option(AMD_RYZEN_HACK "hack for AMD Ryzen FPU bug (support FMA3 and FMA4 in FPU, but does not show in CPUID)" )
 option(STATIC_LINK "emit fully linked binaries" )
-option(RPI "Build for 32-bit Raspberry Pi" )
+option(NON_PC_TARGET "non-pc target build: iphone, andriod, embedded non-i386 SBC, etc" )
 option(SHADOW "use shadow testing framework. linux only" )
 option(ASAN "use address sanitiser, if your system has it" )
 option(JEMALLOC "use jemalloc. Not required on BSD" )
@@ -70,13 +70,13 @@ if(DEBIAN)
   add_definitions(-DDEBIAN)
 else()
   if(NOT ANDROID)
-    if(NOT RPI)
-	  if (NOT USE_AVX2)
+    if(NOT NON_PC_TARGET)
+      if (NOT USE_AVX2)
         set(CRYPTO_FLAGS -march=core2 -msse4.1 -mtune=native -mfpmath=sse)
       else()
         set(CRYPTO_FLAGS -march=haswell -mtune=native -mfpmath=sse)
       endif(NOT USE_AVX2)
-    endif(NOT RPI)
+    endif(NOT NON_PC_TARGET)
   endif(NOT ANDROID)
 endif(DEBIAN)
 
@@ -147,10 +147,11 @@ if(CMAKE_BUILD_TYPE MATCHES "[Dd][Ee][Bb][Uu][Gg]")
   add_compile_options( ${DEBUG_FLAGS} )
 endif(CMAKE_BUILD_TYPE MATCHES "[Dd][Ee][Bb][Uu][Gg]")
 
-if(RPI)
+# Add non-386 target-specific options here
+if(NON_PC_TARGET)
   add_definitions(-DRPI)
   set(WITH_STATIC ON)
-endif(RPI)
+endif(NON_PC_TARGET)
 
 add_compile_options(${OPTIMIZE_FLAGS} ${CRYPTO_FLAGS})
 
@@ -703,11 +704,11 @@ if(WITH_STATIC)
       target_link_libraries(${PLATFORM_LIB} Threads::Threads)
     endif(USE_LIBABYSS)
     if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
-      if(RPI)
+      if(NON_PC_TARGET)
         target_link_libraries(${PLATFORM_LIB} -lrt)
       else()
         target_link_libraries(${PLATFORM_LIB} -lcap)
-      endif(RPI)
+      endif(NON_PC_TARGET)
     endif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     target_link_libraries(${STATIC_LIB} ${CRYPTOGRAPHY_LIB} ${LIBS} ${PLATFORM_LIB})
     if(NOT WITH_SHARED)