Make validator require read sandboxing on ARM.

src/trusted/validator_arm/testdata/compile_tests.sh

 #!/bin/bash
 # Copyright (c) 2011 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.
 
 set -eu
 
 # Get the path to the ARM cross-compiler.
-# We use the trusted compiler because llvm-fake.py (used in the
-# untrusted compiler) doesn't support -nodefaultlibs.
 dir=$(pwd)
 cd ../../../..
-eval "$(tools/llvm/setup_arm_trusted_toolchain.py)"
 topdir=$(pwd)
+tools="$topdir/toolchain/pnacl_linux_x86_64_newlib/pkg/binutils/bin"
 cd $dir
 
-ldscript=$topdir/toolchain/pnacl_linux_x86_64/ldscripts/ld_script_arm_untrusted
+ldscript=$topdir/tools/llvm/ld_script_arm_untrusted
+readonly ARM_LD="$tools/arm-pc-nacl-ld"
+readonly ARM_AS="$tools/arm-pc-nacl-as"
 
-readonly ARM_CROSS_COMPILER="${ARM_CC}"
 for test_file in *.S ; do
   object_file=${test_file%.*}.o
   nexe_file=${test_file%.*}.nexe
+  pre_file=${test_file%.*}.s
 
   echo "compiling $test_file -> $nexe_file"
-  ${ARM_CROSS_COMPILER} \
-      -march=armv7-a -mcpu=cortex-a8 -mfpu=neon -c $test_file -o $object_file
+  cpp $test_file -o $pre_file
+  ${ARM_AS} -march=armv7-a -mcpu=cortex-a8 -mfpu=neon -c $pre_file \
+    -o $object_file
   ${ARM_LD} -static -nodefaultlibs -nostdlib -T $ldscript \
       $object_file -o $nexe_file
+  rm $pre_file $object_file
 done