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+#!/bin/sh
+#
+# Ceres Solver - A fast non-linear least squares minimizer
+# Copyright 2012 Google Inc. All rights reserved.
+# http://code.google.com/p/ceres-solver/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice,
+#   this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+# * Neither the name of Google Inc. nor the names of its contributors may be
+#   used to endorse or promote products derived from this software without
+#   specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+# Author: keir@google.com
+#         settinger@google.com
+#
+# Ceres build script for Android. To build the ceres.so libraray for Android,
+# cd into an empty directory and run the script. Usage:
+#
+#   build_android.sh \
+#   <path to Android NDK> \
+#   <path to Eigen> \
+#   <path to Ceres source>
+#
+#   make
+#
+# This script exists only to make it easier to get Ceres building on Android;
+# as one can see from the code below, it is only a matter of extracting a
+# standalone NDK toolchain from the NDK, and getting the right arguments to
+# CMake to get it to work.
+#
+# Android NDK version r5 or higher is required. Jellybean does not work out of
+# the box, since the android-cmake toolchain is not yet updated to for it.
+#
+# Note: You may wish to run 'ccmake .', the CMake curses GUI, in order to tweak
+# the build parameters that are set by default. There are a few settings to
+# consider changing:
+#
+# SCHUR_SPECIALIZATIONS:
+#
+# Consider if enabling the schur specializations is a big enough win for the
+# problem you are solving, since compiling the schur specializations
+# considerably increases the binary size. Disable them by running 'ccmake .',
+# finding the SCHUR_SPECIALIZATIONS variable, hitting enter (toggling to "off"),
+# pressing 'c' to generate, then 'g' to generate and exit, followed by 'make'.
+#
+# EXECUTABLE_OUTPUT_PATH
+# LIBRARY_OUTPUT_PATH
+# LIBRARY_OUTPUT_PATH_ROOT:
+#
+# In normal CMake builds, where you do an out of source build, the source
+# directory is untouched when building. However, by default the Android CMake
+# toolchain selects locations under your *source* tree for the final library
+# and binary destinations. For example, if your Ceres git tree is under
+# ceres-solver.git/ and the build directory you are using is
+# ceres-android-bin/, the resulting binaries will live in ceres-solver.git/
+# (but not the intermediate .o files!) By changing the variables
+# EXECUTABLE_OUTPUT_PATH, LIBRARY_OUTPUT_PATH, and LIBRARY_OUTPUT_PATH_ROOT to
+# something under e.g. ceres-android-bin/ then true out-of-ource builds work.
+
+if [ $# -ne 3 ] ; then
+  echo "usage: build_android.sh \\"
+  echo "       <path to Android NDK> \\"
+  echo "       <path to Eigen> \\"
+  echo "       <path to Ceres source>"
+  exit 1
+fi
+
+if [ -f "CMakeLists.txt" ] ; then
+  echo "ERROR: Can't run from inside the source tree."
+  echo "       Make a new directory that's not under"
+  echo "       the main Ceres source tree."
+  exit 1
+fi
+
+# For some reason, using the NDK in-place doesn't work even though the
+# android-cmake toolchain appears to support it.
+#
+# TODO(keir): Figure out the issue with the stand-alone NDK and don't create
+# the extra stand-alone toolchain. Also test with other NDK versions and add
+# explicit checks to ensure a compatible version is used.
+ANDROID_NDK=$1
+MAKE_ANDROID_TOOLCHAIN=$ANDROID_NDK/build/tools/make-standalone-toolchain.sh
+if [ ! -f $MAKE_ANDROID_TOOLCHAIN ] ; then
+  echo "ERROR: First argument doesn't appear to be the NDK root; missing:"
+  echo "       $MAKE_ANDROID_TOOLCHAIN"
+  exit 1
+fi
+
+EIGEN_DIR=$2
+if [ ! -f $EIGEN_DIR/eigen3.pc.in ] ; then
+  echo "ERROR: Second argument doesn't appear to be Eigen3; missing:"
+  echo "       $EIGEN_DIR/eigen3.pc.in"
+  exit 1
+fi
+
+CERES_SOURCE_ROOT=$3
+if [ ! -f "$CERES_SOURCE_ROOT/internal/ceres/CMakeLists.txt" ] ; then
+  echo "ERROR: Third argument doesn't appear to be the Ceres source directory."
+  exit 1
+fi
+echo "Using Ceres source directory: $CERES_SOURCE_ROOT"
+
+# Make a standalone Android NDK toolchain if needed.
+export ANDROID_STANDALONE_TOOLCHAIN="`pwd`/toolchain"
+if [ ! -d "$ANDROID_STANDALONE_TOOLCHAIN" ] ; then
+  echo "Extracting the Android GCC standalone toolchain to:"
+  echo "    $ANDROID_STANDALONE_TOOLCHAIN..."
+  $ANDROID_NDK/build/tools/make-standalone-toolchain.sh \
+  --platform=android-8 \
+  --install-dir=$ANDROID_STANDALONE_TOOLCHAIN
+else
+  echo "Found NDK standalone toolchain; skipping creation."
+fi
+
+# Get the Android CMake NDK toolchain file if needed.
+if [ ! -d "android-cmake" ] ; then
+  hg clone https://code.google.com/p/android-cmake/
+else
+  echo "Found Android-CMake toolchain; skipping download."
+fi
+
+ANDROID_CMAKE_TOOLCHAIN=android-cmake/toolchain/android.toolchain.cmake
+if [ ! -f $ANDROID_CMAKE_TOOLCHAIN ] ; then
+  echo "ERROR: It seems the toolchain file is missing:"
+  echo "       $ANDROID_CMAKE_TOOLCHAIN"
+  exit 1
+fi
+
+cmake $CERES_SOURCE_ROOT \
+      -DCMAKE_TOOLCHAIN_FILE=$ANDROID_CMAKE_TOOLCHAIN \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DEIGEN_INCLUDE=$EIGEN_DIR \
+      -DBUILD_ANDROID=ON \
+      -DSUITESPARSE=OFF \
+      -DGFLAGS=OFF \
+      -DCXSPARSE=OFF \
+      -DPROTOBUF=OFF