add Android class library instructions to README.md

README.md

@@ -95,7 +95,8 @@ certain flags described below, all of which are optional.
         continuations={true,false} \
         use-clang={true,false} \
         openjdk=<openjdk installation directory> \
-        openjdk-src=<openjdk source directory>
+        openjdk-src=<openjdk source directory> \
+        android=<android source directory>
 
   * `platform` - the target platform  
     * _default:_ output of $(uname -s | tr [:upper:] [:lower:]),
@@ -156,8 +157,8 @@ Note that this does not currently affect cross compiles, only
 native builds.  
     * _default:_ false
 
-  * `openjdk` - if set, use OpenJDK class library instead of the default
-Avian class library.  See "Building with the OpenJDK Class
+  * `openjdk` - if set, use the OpenJDK class library instead of the
+default Avian class library.  See "Building with the OpenJDK Class
 Library" below for details.  
     * _default:_ not set
 
@@ -168,6 +169,11 @@ sources found under the specified directory.  See "Building with
 the OpenJDK Class Library" below for details.  
     * _default:_ not set
 
+  * `android` - if set, use the Android class library instead of the
+default Avian class library.  See "Building with the Android Class
+Library" below for details.
+    * _default:_ not set
+
 These flags determine the name of the directory used for the build.
 The name always starts with _${platform}-${arch}_, and each non-default
 build option is appended to the name.  For example, a debug build with
@@ -235,6 +241,7 @@ Finally, build with the msvc flag set to the MSVC tool directory:
 
     $ make msvc="/cygdrive/c/Program Files/Microsoft Visual Studio 9.0/VC"
 
+
 Building with the OpenJDK Class Library
 ---------------------------------------
 
@@ -306,7 +313,7 @@ _Stand-alone build:_
     $ apt-get install openjdk-7-jdk
     $ apt-get source openjdk-7-jdk
     $ apt-get build-dep openjdk-7-jdk
-    (cd openjdk-7-7~b147-2.0 && dpkg-buildpackage)
+    $ (cd openjdk-7-7~b147-2.0 && dpkg-buildpackage)
     $ make openjdk=/usr/lib/jvm/java-7-openjdk \
         openjdk-src=$(pwd)/openjdk-7-7~b147-2.0/build/openjdk/jdk/src \
         test
@@ -339,6 +346,51 @@ Currently, only OpenJDK 7 is supported.  Later versions might work,
 but have not yet been tested.
 
 
+Building with the Android Class Library
+---------------------------------------
+
+As an alternative to both the Avian and OpenJDK class libaries, you
+can also build with the Android Class Library on some platforms
+(currently just Linux, but possibly others in the future).  To build
+this way, do the following, starting from the Avian directory:
+
+    $ cd ..
+    $ mkdir android
+    $ git clone https://android.googlesource.com/platform/bionic
+    $ git clone https://android.googlesource.com/platform/system/core
+    $ git clone https://android.googlesource.com/platform/external/expat
+    $ git clone https://android.googlesource.com/platform/external/fdlibm
+    $ git clone https://android.googlesource.com/platform/external/icu4c
+    $ git clone https://android.googlesource.com/platform/libnativehelper
+    $ git clone https://android.googlesource.com/platform/external/openssl
+    $ git clone https://android.googlesource.com/platform/external/zlib
+    $ git clone git://git.openssl.org/openssl.git openssl-upstream
+    $ git clone https://github.com/dicej/android-libcore64 libcore
+    $ (cd expat && CFLAGS=-fPIC CXXFLAGS=-fPIC ./configure --enable-static \
+         && make)
+    $ (cd fdlibm && CFLAGS=-fPIC bash configure && make)
+    $ (cd icu4c && CFLAGS=-fPIC CXXFLAGS=-fPIC ./configure --enable-static \
+         && make)
+    $ (cd openssl-upstream && git checkout OpenSSL_1_0_1e \
+         && (for x in ../openssl/patches/*.patch; do patch -p1 < $x; done) \
+         && CC="gcc -fPIC" ./config && make)
+    $ cd ../avian
+    $ make android=$(pwd)/../android test
+
+Note that we use https://github.com/dicej/android-libcore64 above
+instead of the upstream
+https://android.googlesource.com/platform/libcore repository.  This is
+temporary until upstream has been patched with 64-bit support.
+
+Also note that we use the upstream OpenSSL repository and apply the
+Android patches to it.  This is because it is not clear how to build
+the Android fork of OpenSSL directly without checking out and building
+the entire platform.  As of this writing, the patches apply cleanly
+against OpenSSL 1.0.1e, so that's the tag we check out, but this may
+change in the future when the Android fork rebases against a new
+OpenSSL version.
+
+
 Installing
 ----------
 

makefile

@@ -177,8 +177,8 @@ ifneq ($(android),)
 		$(android)/icu4c/lib/libicudata.a \
 		$(android)/fdlibm/libfdm.a \
 		$(android)/expat/.libs/libexpat.a \
-		$(android)/openssl-1.0.1e/libssl.a \
-		$(android)/openssl-1.0.1e/libcrypto.a \
+		$(android)/openssl-upstream/libssl.a \
+		$(android)/openssl-upstream/libcrypto.a \
 		-lstdc++
 	luni-cpps := $(shell find $(luni-native) -name '*.cpp')	
 	classpath-objects = \