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

2 files changed, 5 insertions, 1 deletions

diff --git a/lib/erl_interface/src/connect/ei_connect.c b/lib/erl_interface/src/connect/ei_connect.c
index 3175d1bdfd..2e8418d61e 100644
--- a/lib/erl_interface/src/connect/ei_connect.c
+++ b/lib/erl_interface/src/connect/ei_connect.c
@@ -1166,7 +1166,11 @@ static unsigned int gen_challenge(void)
     uname(&s.name);
     s.cpu  = clock();
     s.pid  = getpid();
+#ifndef __ANDROID__
     s.hid  = gethostid();
+#else
+    s.hid  = 0;
+#endif
     s.uid  = getuid();
     s.gid  = getgid();
 
diff --git a/lib/erl_interface/src/connect/ei_resolve.c b/lib/erl_interface/src/connect/ei_resolve.c
index 74dcba61a7..cffcac801c 100644
--- a/lib/erl_interface/src/connect/ei_resolve.c
+++ b/lib/erl_interface/src/connect/ei_resolve.c
@@ -642,7 +642,7 @@ struct hostent *ei_gethostbyname_r(const char *name,
 #ifndef HAVE_GETHOSTBYNAME_R
   return my_gethostbyname_r(name,hostp,buffer,buflen,h_errnop);
 #else
-#if (defined(__GLIBC__) || (__FreeBSD_version >= 602000) || defined(__DragonFly__))
+#if (defined(__GLIBC__) || (__FreeBSD_version >= 602000) || defined(__DragonFly__) || defined(__ANDROID__))
   struct hostent *result;
 
   gethostbyname_r(name, hostp, buffer, buflen, &result, h_errnop);