build: add android support

Resolves minor discrepancies between android and standard POSIX systems.
In addition, some configure parameters were added, and a helper-script
for android configuration. Ideally, this script should be merged into
the standard configure script.

To build for android, source the android-configure script with an NDK
path:

    source ./android-configure ~/android-ndk-r8d

This will create an android standalone toolchain and export the
necessary environment parameters.

After that, build as normal:

    make -j8

After the build, you should now have android-compatible NodeJS binaries.

Author: Linus Mårtensson

android-configure

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+export TOOLCHAIN=$PWD/android-toolchain
+mkdir -p $TOOLCHAIN
+$1/build/tools/make-standalone-toolchain.sh \
+    --toolchain=arm-linux-androideabi-4.7 \
+    --arch=arm \
+    --install-dir=$TOOLCHAIN \
+    --platform=android-9
+export PATH=$TOOLCHAIN/bin:$PATH
+export AR=arm-linux-androideabi-ar
+export CC=arm-linux-androideabi-gcc
+export CXX=arm-linux-androideabi-g++
+export LINK=arm-linux-androideabi-g++
+
+./configure \
+    --without-snapshot \
+    --dest-cpu=arm \
+    --dest-os=android

common.gypi

@@ -161,10 +161,14 @@
           'BUILDING_UV_SHARED=1',
         ],
       }],
-      [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"', {
-        'cflags': [ '-Wall', '-Wextra', '-Wno-unused-parameter', '-pthread', ],
+      [ 'OS in "linux freebsd openbsd solaris"', {
+        'cflags': [ '-pthread', ],
+        'ldflags': [ '-pthread' ],
+      }],
+      [ 'OS in "linux freebsd openbsd solaris android"', {
+        'cflags': [ '-Wall', '-Wextra', '-Wno-unused-parameter', ],
         'cflags_cc': [ '-fno-rtti', '-fno-exceptions' ],
-        'ldflags': [ '-pthread', '-rdynamic' ],
+        'ldflags': [ '-rdynamic' ],
         'target_conditions': [
           ['_type=="static_library"', {
             'standalone_static_library': 1, # disable thin archive which needs binutils >= 2.19
@@ -187,6 +191,10 @@
           }],
         ],
       }],
+      [ 'OS=="android"', {
+        'defines': ['_GLIBCXX_USE_C99_MATH'],
+        'libraries': [ '-llog' ],
+      }],
       ['OS=="mac"', {
         'defines': ['_DARWIN_USE_64_BIT_INODE=1'],
         'xcode_settings': {

configure

@@ -237,7 +237,7 @@ parser.add_option("--dest-os",
     action="store",
     dest="dest_os",
     help="Operating system to build for. Valid values are: "
-         "win, mac, solaris, freebsd, openbsd, linux")
+         "win, mac, solaris, freebsd, openbsd, linux, android")
 
 parser.add_option("--no-ifaddrs",
     action="store_true",
@@ -434,6 +434,8 @@ def configure_arm(o):
 
 
 def configure_node(o):
+  if options.dest_os == 'android':
+    o['variables']['OS'] = "android"
   o['variables']['v8_enable_gdbjit'] = 1 if options.gdb else 0
   o['variables']['v8_no_strict_aliasing'] = 1 # work around compiler bugs
   o['variables']['node_prefix'] = os.path.expanduser(options.prefix or '')
@@ -641,6 +643,7 @@ configure_v8(output)
 configure_openssl(output)
 configure_winsdk(output)
 
+
 # variables should be a root level element,
 # move everything else to target_defaults
 variables = output['variables']

doc/api/process.markdown

@@ -213,7 +213,8 @@ The shell that executed node should see the exit code as 1.
 
 ## process.getgid()
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Gets the group identity of the process. (See getgid(2).)
 This is the numerical group id, not the group name.
@@ -225,7 +226,8 @@ This is the numerical group id, not the group name.
 
 ## process.setgid(id)
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Sets the group identity of the process. (See setgid(2).)  This accepts either
 a numerical ID or a groupname string. If a groupname is specified, this method
@@ -245,7 +247,8 @@ blocks while resolving it to a numerical ID.
 
 ## process.getuid()
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Gets the user identity of the process. (See getuid(2).)
 This is the numerical userid, not the username.
@@ -257,7 +260,8 @@ This is the numerical userid, not the username.
 
 ## process.setuid(id)
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Sets the user identity of the process. (See setuid(2).)  This accepts either
 a numerical ID or a username string.  If a username is specified, this method
@@ -277,15 +281,17 @@ blocks while resolving it to a numerical ID.
 
 ## process.getgroups()
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Returns an array with the supplementary group IDs. POSIX leaves it unspecified
 if the effective group ID is included but node.js ensures it always is.
 
 
 ## process.setgroups(groups)
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Sets the supplementary group IDs. This is a privileged operation, meaning you
 need to be root or have the CAP_SETGID capability.
@@ -295,7 +301,8 @@ The list can contain group IDs, group names or both.
 
 ## process.initgroups(user, extra_group)
 
-Note: this function is only available on POSIX platforms (i.e. not Windows)
+Note: this function is only available on POSIX platforms (i.e. not Windows,
+Android)
 
 Reads /etc/group and initializes the group access list, using all groups of
 which the user is a member. This is a privileged operation, meaning you need

src/cares_wrap.cc

@@ -31,7 +31,10 @@
 #include "tree.h"
 #include "uv.h"
 
-#if defined(__OpenBSD__) || defined(__MINGW32__) || defined(_MSC_VER)
+#if defined(__ANDROID__) || \
+    defined(__MINGW32__) || \
+    defined(__OpenBSD__) || \
+    defined(_MSC_VER)
 # include <nameser.h>
 #else
 # include <arpa/nameser.h>

src/node.cc

@@ -61,7 +61,7 @@ typedef int mode_t;
 #include <sys/types.h>
 #include "zlib.h"
 
-#ifdef __POSIX__
+#if defined(__POSIX__) && !defined(__ANDROID__)
 # include <pwd.h> /* getpwnam() */
 # include <grp.h> /* getgrnam() */
 #endif
@@ -1374,7 +1374,7 @@ static Handle<Value> Umask(const Arguments& args) {
 }
 
 
-#ifdef __POSIX__
+#if defined(__POSIX__) && !defined(__ANDROID__)
 
 static const uid_t uid_not_found = static_cast<uid_t>(-1);
 static const gid_t gid_not_found = static_cast<gid_t>(-1);
@@ -1650,7 +1650,7 @@ static Handle<Value> InitGroups(const Arguments& args) {
   return Undefined(node_isolate);
 }
 
-#endif // __POSIX__
+#endif // __POSIX__ && !defined(__ANDROID__)
 
 
 v8::Handle<v8::Value> Exit(const v8::Arguments& args) {
@@ -2349,7 +2349,7 @@ Handle<Object> SetupProcessObject(int argc, char *argv[]) {
 
   NODE_SET_METHOD(process, "umask", Umask);
 
-#ifdef __POSIX__
+#if defined(__POSIX__) && !defined(__ANDROID__)
   NODE_SET_METHOD(process, "getuid", GetUid);
   NODE_SET_METHOD(process, "setuid", SetUid);
 
@@ -2359,7 +2359,7 @@ Handle<Object> SetupProcessObject(int argc, char *argv[]) {
   NODE_SET_METHOD(process, "getgroups", GetGroups);
   NODE_SET_METHOD(process, "setgroups", SetGroups);
   NODE_SET_METHOD(process, "initgroups", InitGroups);
-#endif // __POSIX__
+#endif // __POSIX__ && !defined(__ANDROID__)
 
   NODE_SET_METHOD(process, "_kill", Kill);