Enable building V8 for Android on Mac

tools/android-build.sh

 #!/bin/bash
 # Copyright 2012 the V8 project authors. All rights reserved.
 # 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.
 
 if [ ${#@} -lt 4 ] ; then
-  echo "Error: $0 needs 4 arguments."
+  echo "$0: Error: needs 4 arguments."
   exit 1
 fi
 
 ARCH=$1
 MODE=$2
 OUTDIR=$3
 GYPFLAGS=$4
 
 host_os=$(uname -s | sed -e 's/Linux/linux/;s/Darwin/mac/')
 
 case "${host_os}" in
   "linux")
     toolchain_dir="linux-x86"
     ;;
+  "mac")
+    toolchain_dir="darwin-x86"
+    ;;
   *)
-    echo "Host platform ${host_os} is not supported" >& 2
+    echo "$0: Host platform ${host_os} is not supported" >& 2
     exit 1
 esac
 
 case "${ARCH}" in
   "android_arm")
     DEFINES=" target_arch=arm v8_target_arch=arm android_target_arch=arm"
     DEFINES+=" arm_neon=0 armv7=1"
     toolchain_arch="arm-linux-androideabi-4.4.3"
     ;;
   "android_ia32")
     DEFINES=" target_arch=ia32 v8_target_arch=ia32 android_target_arch=x86"
     toolchain_arch="x86-4.4.3"
     ;;
   *)
-    echo "Architecture: ${ARCH} is not supported." >& 2
-    echo "Current supported architectures: arm|ia32." >& 2
+    echo "$0: Target architecture ${ARCH} is not supported." >& 2
+    echo "$0: Current supported architectures: android_arm|android_ia32." >& 2
     exit 1
 esac
 
 toolchain_path="${ANDROID_NDK_ROOT}/toolchains/${toolchain_arch}/prebuilt/"
 ANDROID_TOOLCHAIN="${toolchain_path}/${toolchain_dir}/bin"
 if [ ! -d "${ANDROID_TOOLCHAIN}" ]; then
-  echo "Cannot find Android toolchain in ${ANDROID_TOOLCHAIN}." >& 2
-  echo "The NDK version might be wrong." >& 2
+  echo "$0: Cannot find Android toolchain in ${ANDROID_TOOLCHAIN}." >& 2
+  echo "$0: The NDK version might be wrong." >& 2
   exit 1
 fi
 
-# The set of GYP_DEFINES to pass to gyp. 
+# For mksnapshot host generation.
+DEFINES+=" host_os=${host_os}"
+
+# The set of GYP_DEFINES to pass to gyp.
 export GYP_DEFINES="${DEFINES}"
 
-export GYP_GENERATORS=make
+# Use the "android" flavor of the Makefile generator for both Linux and OS X.
+export GYP_GENERATORS=make-android
 export CC=${ANDROID_TOOLCHAIN}/*-gcc
 export CXX=${ANDROID_TOOLCHAIN}/*-g++
 build/gyp/gyp --generator-output="${OUTDIR}" build/all.gyp \
               -Ibuild/standalone.gypi --depth=. -Ibuild/android.gypi \
               -S.${ARCH} ${GYPFLAGS}
 
 export AR=${ANDROID_TOOLCHAIN}/*-ar
 export RANLIB=${ANDROID_TOOLCHAIN}/*-ranlib
 export LD=${ANDROID_TOOLCHAIN}/*-ld
 export LINK=${ANDROID_TOOLCHAIN}/*-g++
-export BUILDTYPE=${MODE[@]^}
-export builddir=$(readlink -f ${PWD})/${OUTDIR}/${ARCH}.${MODE}
+export BUILDTYPE=$(echo ${MODE} | python -c "print raw_input().capitalize()")
+export builddir=${PWD}/${OUTDIR}/${ARCH}.${MODE}
 make -C "${OUTDIR}" -f Makefile.${ARCH}