Raspberry PI / Android a minimal cross-compile configuration

Enable a cross compile Erlang/OTP platform to Android or Raspberry PI
using Android NDK. Port emulator and core application to support target
HW platform. Exclude any add-on services required for OTP platform deployment
into target hardware due to device fragmentation and jail-break requirements.

 * fix erts/emulator/beam/sys.h
   Disable redefinition of __noreturn macro

 * port erts/emulator/sys/unix/erl_child_setup.c
   Use techniques proposed by https://code.google.com/p/erlang4android to
   access system properties

 * fix erts/emulator/sys/unix/erl_unix_sys_ddll.c
   The static linking of emulator cannot find dlerror(), dlopen() symbols

 * port erts/emulator/sys/unix/sys.c
   make path to shell configurable at build time

 * port erts/etc/common/Makefile.in
   disable librt for *-linux-androideabi

 * port erts/lib_src/pthread/ethread.c
   Use techniques proposed by https://code.google.com/p/erlang4android to
   disable emulator crash if kernel threads are on. Replace unreliable
   pthread_sigmask() by sigprocmask()

 * port lib/erl_interface/src/connect/ei_connect.c
   Disable call to undefined gethostid()

 * port lib/erl_interface/src/connect/ei_resolve.c
   Use gethostbyname_r() on Android platform

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/os_mon/c_src/memsup.c b/lib/os_mon/c_src/memsup.c
index b5114d10ed..409db84aa7 100644
--- a/lib/os_mon/c_src/memsup.c
+++ b/lib/os_mon/c_src/memsup.c
@@ -324,7 +324,7 @@ get_mem_procfs(memory_ext *me){
 
 /* arch specific functions */
 
-#if defined(__linux__) /* ifdef SYSINFO */
+#if defined(__linux__) && !defined(__ANDROID__)/* ifdef SYSINFO */
 /* sysinfo does not include cached memory which is a problem. */
 static int
 get_extended_mem_sysinfo(memory_ext *me) {
@@ -395,8 +395,12 @@ get_extended_mem_sgi(memory_ext *me) {
 
 static void
 get_extended_mem(memory_ext *me) {
+/* android */
+#if defined(__ANDROID__)
+    if (get_mem_procfs(me))  return;   
+
 /* linux */
-#if defined(__linux__)
+#elif defined(__linux__)
     if (get_mem_procfs(me))  return;
     if (get_extended_mem_sysinfo(me)) return;