Fix Clang build on Android.

build/android/envsetup.sh

 #!/bin/bash
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Sets up environment for building Chromium on Android.  It can either be
 # compiled with the Android tree or using the Android SDK/NDK. To build with
 # NDK/SDK: ". build/android/envsetup.sh --sdk".  Environment variable
 # ANDROID_SDK_BUILD=1 will then be defined and used in the rest of the setup to
@@ skipping 77 matching lines @@
 
 # Source a bunch of helper functions
 . ${CHROME_SRC}/build/android/adb_device_functions.sh
 
 ANDROID_GOMA_WRAPPER=""
 if [[ -d $GOMA_DIR ]]; then
   ANDROID_GOMA_WRAPPER="$GOMA_DIR/gomacc"
 fi
 export ANDROID_GOMA_WRAPPER
 
-export CC_target="${ANDROID_GOMA_WRAPPER} $(echo -n ${ANDROID_TOOLCHAIN}/*-gcc)"
-export CXX_target="${ANDROID_GOMA_WRAPPER} \
-  $(echo -n ${ANDROID_TOOLCHAIN}/*-g++)"
-export LINK_target=$(echo -n ${ANDROID_TOOLCHAIN}/*-gcc)
-export AR_target=$(echo -n ${ANDROID_TOOLCHAIN}/*-ar)
+# http://crbug.com/143889.
+if ! echo "$GYP_DEFINES" | tr ' ' '\n' | grep -q '^clang=' | tail -n1 | \
+    grep -xq clang=1; then
+  export CC_target="${ANDROID_GOMA_WRAPPER} \
+    $(echo -n ${ANDROID_TOOLCHAIN}/*-gcc)"
+  export CXX_target="${ANDROID_GOMA_WRAPPER} \
+    $(echo -n ${ANDROID_TOOLCHAIN}/*-g++)"
+  export LINK_target=$(echo -n ${ANDROID_TOOLCHAIN}/*-gcc)
+  export AR_target=$(echo -n ${ANDROID_TOOLCHAIN}/*-ar)
+fi
 
 # Performs a gyp_chromium run to convert gyp->Makefile for android code.
 android_gyp() {
   echo "GYP_GENERATORS set to '$GYP_GENERATORS'"
   "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" --check "$@"
 }
 
 # FLOCK needs to be null on system that has no flock
 which flock > /dev/null || export FLOCK=