Copy Dart-configuration detection from dart script to pub.

sdk/bin/pub

Index: sdk/bin/pub
diff --git a/sdk/bin/pub b/sdk/bin/pub
index 50f0d1d391ad28dbc9b6ec39b788d6a7e53351b5..a8514ea1294f30d38a1024932aacf63d568f0876 100755
--- a/sdk/bin/pub
+++ b/sdk/bin/pub
@@ -29,6 +29,13 @@ SNAPSHOT="$BIN_DIR/snapshots/pub.dart.snapshot"
 unset VM_OPTIONS
 declare -a VM_OPTIONS
 
+if [[ `uname` == 'Darwin' ]];
+then
+  OUT_DIR="$BIN_DIR"/../../xcodebuild/
+else
+  OUT_DIR="$BIN_DIR"/../../out/
+fi
+
 # Allow extra VM options to be passed in through an environment variable.
 if [[ $DART_VM_OPTIONS ]]; then
   read -a OPTIONS <<< "$DART_VM_OPTIONS"
@@ -37,7 +44,29 @@ fi
 
 if [ -z "$DART_CONFIGURATION" ];
 then
-  DART_CONFIGURATION="ReleaseX64"
+  DIRS=$( ls "$OUT_DIR" )
+  # list of possible configurations in decreasing desirability
+  CONFIGS=("ReleaseX64" "ReleaseIA32" "DebugX64" "DebugIA32"
+    "ReleaseARM"    "ReleaseARM64"    "ReleaseARMV5TE"    "ReleaseMIPS"
+    "DebugARM"      "DebugARM64"      "DebugARMV5TE"      "DebugMIPS")
+  DART_CONFIGURATION="None"
+  for CONFIG in ${CONFIGS[*]}
+  do
+    for DIR in $DIRS;
+    do
+      if [ "$CONFIG" = "$DIR" ];
+      then
+        # choose most desirable configuration that is available and break
+        DART_CONFIGURATION="$DIR"
+        break 2
+      fi
+    done
+  done
+  if [ "$DART_CONFIGURATION" = "None" ]
+  then
+    echo "No valid dart configuration found in $OUT_DIR"
+    exit 1
+  fi
 fi
 
 if [[ `uname` == 'Darwin' ]];