Add ARM toolchain support.

examples/systems/dosbox-0.74/nacl-dosbox-0.74.sh

 #!/bin/bash
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 # nacl-dosbox-0.74.sh
 #
 # usage:  nacl-dosbox-0.74.sh
 #
@@ skipping 11 matching lines @@
 
 CustomConfigureStep() {
   Banner "Configuring ${PACKAGE_NAME}"
 
   # export the nacl tools
   export CC=${NACLCC}
   export CXX=${NACLCXX}
   # NOTE: non-standard flag NACL_LDFLAGS because of some more hacking below
   export CXXFLAGS="-O2 -g"
   export NACL_LDFLAGS=""
-  if [ ${NACL_PACKAGES_BITSIZE} == "pnacl" ] ; then
+  if [ ${NACL_ARCH} = "pnacl" ] ; then
     export CXXFLAGS="-O3 -g"
     export NACL_LDFLAGS="-O0 -static"
   fi
   export AR=${NACLAR}
   export RANLIB=${NACLRANLIB}
   export STRIP=${NACLSTRIP}
   export PKG_CONFIG_PATH=${NACL_SDK_USR_LIB}/pkgconfig
   export PKG_CONFIG_LIBDIR=${NACL_SDK_USR_LIB}
 
   export LIBS="-L${NACL_SDK_USR_LIB} \
       -lm \
       -lpng \
       -lz"
 
-  CONFIG_FLAGS="--host=${CROSS_ID}-pc-nacl \
+  CONFIG_FLAGS="--host=${NACL_ARCH}-pc-nacl \
       --prefix=${NACL_SDK_USR} \
       --exec-prefix=${NACL_SDK_USR} \
       --libdir=${NACL_SDK_USR_LIB} \
       --oldincludedir=${NACL_SDK_USR_INCLUDE} \
       --with-sdl-prefix=${NACL_SDK_USR} \
       --with-sdl-exec-prefix=${NACL_SDK_USR}"
 
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   ./autogen.sh
 
@@ skipping 35 matching lines @@
 }
 
 CustomInstallStep(){
   DOSBOX_DIR=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   DOSBOX_BUILD=${DOSBOX_DIR}/${PACKAGE_NAME}-build
   PUBLISH_DIR="${NACL_PACKAGES_PUBLISH}/${PACKAGE_NAME}"
   MakeDir ${PUBLISH_DIR}
   install ${START_DIR}/dosbox.html ${PUBLISH_DIR}
   install ${START_DIR}/dosbox.nmf ${PUBLISH_DIR}
   install ${DOSBOX_BUILD}/src/dosbox \
-      ${PUBLISH_DIR}/dosbox_x86-${NACL_PACKAGES_BITSIZE}.nexe
+      ${PUBLISH_DIR}/dosbox_${NACL_ARCH}.nexe
   DefaultTouchStep
 }
 
 CustomPackageInstall() {
   DefaultPreInstallStep
   DefaultDownloadStep
   DefaultExtractStep
   DefaultPatchStep
   CustomConfigureStep
   DefaultBuildStep
-  if [ ${NACL_PACKAGES_BITSIZE} == "pnacl" ] ; then
+  if [ ${NACL_ARCH} = "pnacl" ] ; then
     DefaultTranslateStep ${PACKAGE_NAME} ${PACKAGE_NAME}-build/src/dosbox
   fi
   CustomInstallStep
   DefaultCleanUpStep
 }
 
 CustomPackageInstall
 exit 0