Support symlinking to dart-sdk executables on Linux and Mac.

sdk/bin/dartanalyzer_developer

 #!/bin/bash
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file is used to execute the analyzer by running the jar file.
 # It is a simple wrapper enabling us to have simpler command lines in
 # the testing infrastructure.
 set -e
 
-function follow_links() {
-  while [ -h "$1" ]; do
-    # On Mac OS, readlink -f doesn't work.
-    1="$(readlink "$1")"
-  done
-  echo "$1"
-}
-
 FOUND_BATCH=0
 for ARG in "$@"
 do
   case $ARG in
     -batch|--batch)
       FOUND_BATCH=1
       ;;
     *)
       ;;
   esac
 done
 
-# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
-PROG_NAME="$(follow_links "$BASH_SOURCE")"
-
-# Handle the case where the binary dir has been symlinked to.
-CUR_DIR="$(follow_links "$(cd "${PROG_NAME%/*}" ; pwd -P)")"
-
+# Setting BIN_DIR this way is ugly, but is needed to handle the case where
+# dart-sdk/bin or the script itself has been symlinked to. On MacOS, readlink -f
+# doesn't work with this case.
+SCRIPT=`readlink "$0" || echo "$0"`
+CUR_DIR="$(cd "${SCRIPT%/*}" ; pwd -P)"
 SDK_DIR="$(cd "${CUR_DIR}/.." ; pwd -P)"
 
 if [ -z "$DART_CONFIGURATION" ];
 then
   DART_CONFIGURATION="ReleaseIA32"
 fi
 
 if [ `uname` == 'Darwin' ];
 then
   JAR_DIR="$CUR_DIR"/../../xcodebuild/$DART_CONFIGURATION/dartanalyzer
@@ skipping 11 matching lines @@
 else
   # On other architectures
   # -batch invocations will do better with a server vm
   # invocations for analyzing a single file do better with a client vm
   if [ $FOUND_BATCH -eq 0 ] ; then
     EXTRA_JVMARGS+=" -client "
   fi
 fi
 
 exec java $EXTRA_JVMARGS -jar $JAR_FILE --dart-sdk "$SDK_DIR" "$@"