Add a flag to fail if the tests fail to build. Off by default.

src/scripts/build_autotest.sh

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script makes autotest client tests inside a chroot environment.  The idea
 # is to compile any platform-dependent autotest client tests in the build
 # environment, since client systems under test lack the proper toolchain.
 #
 # The user can later run autotest against an ssh enabled test client system, or
 # install the compiled client tests directly onto the rootfs image.
 
 # Includes common already
 . "$(dirname $0)/autotest_lib.sh"
 
 # Script must be run inside the chroot
 assert_inside_chroot
 
 DEFAULT_TESTS_LIST="all"
 
 DEFINE_string build "${DEFAULT_TESTS_LIST}" \
   "a comma seperated list of autotest client tests to be prebuilt." b
 DEFINE_boolean prompt $FLAGS_TRUE "Prompt user when building all tests."
 DEFINE_boolean autox $FLAGS_TRUE "Build autox along with autotest"
+DEFINE_boolean buildcheck $FLAGS_FALSE "Fail if tests fail to build"
 
 # More useful help
 FLAGS_HELP="usage: $0 [flags]"
 
 # parse the command-line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 set -e
 
 check_board
@@ skipping 22 matching lines @@
       echo -n "E.g.: ./enter_chroot.sh \"./build_autotest.sh "
       echo "--build=system_SAT\""
       exit 0
     fi
   fi
   TEST_LIST=${ALL_TESTS}
 else
   TEST_LIST=${FLAGS_build}
 fi
 
-# Decide whether or not to build autox and set use flag
-if [ $FLAGS_autox -eq "$FLAGS_TRUE" ] ; then
-  USE=
-else
-  USE=-autox
-fi 
+# Decide on USE flags based on options
+USE=
+[ $FLAGS_autox -eq "$FLAGS_FALSE" ] && USE="${USE} -autox"
+[ $FLAGS_buildcheck -eq "$FLAGS_TRUE" ] && USE="${USE} buildcheck"
 
 GCLIENT_ROOT="${GCLIENT_ROOT}" TEST_LIST=${TEST_LIST} FEATURES="-buildpkg" \
   USE="$USE" "emerge-${FLAGS_board}" chromeos-base/autotest