Fix Clang build on Android.

build/android/envsetup.sh

Index: build/android/envsetup.sh
diff --git a/build/android/envsetup.sh b/build/android/envsetup.sh
index b0024858d70492f11ba2de8a541d7c71341a9f03..a4046f21997fd491e3f833583ff411b930677df5 100755
--- a/build/android/envsetup.sh
+++ b/build/android/envsetup.sh
@@ -104,7 +104,22 @@ export AR_target=$(echo -n ${ANDROID_TOOLCHAIN}/*-ar)
 # Performs a gyp_chromium run to convert gyp->Makefile for android code.
 android_gyp() {
   echo "GYP_GENERATORS set to '$GYP_GENERATORS'"
-  "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" --check "$@"
+  # http://crbug.com/143889.
+  # In case we are doing a Clang build, we have to unset CC_target and
+  # CXX_target. Otherwise GYP ends up generating a gcc build (although we set
+  # 'clang' to 1). This behavior was introduced by
+  # 54d2f6fe6d8a7b9d9786bd1f8540df6b4f46b83f in GYP.
+  (
+    # Fork to avoid side effects on the user's environment variables.
+    if echo "$GYP_DEFINES" | grep -q clang; then

[hans, 2012/09/03 13:53:19]

What if i have clang=0 in my GYP_DEFINES?
This looks pretty rigid..

[Philippe, 2012/09/03 14:02:29]

Indeed. I guess you would be the first one to have that but you're right this
should have been more robust :)

+      if echo "$CC_target" | grep -q gcc; then
+        unset AR_target
+        unset CC_target
+        unset CXX_target
+      fi
+    fi
+    "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" --check "$@"
+  )
 }
 
 # FLOCK needs to be null on system that has no flock