Unbreak armhf-debian toolchain

Change-Id: I85caa09a7c2e4955c3d310a2d5f4a753c5dc35af
diff --git a/aos/vision/image/image_stream.h b/aos/vision/image/image_stream.h
index bdfbc31..ac25394 100644
--- a/aos/vision/image/image_stream.h
+++ b/aos/vision/image/image_stream.h
@@ -33,7 +33,7 @@
 
   void ProcessHelper(DataRef data, aos::monotonic_clock::time_point timestamp) {
     if (data.size() < 300) {
-      LOG(INFO, "got bad img of size(%lu)\n", data.size());
+      LOG(INFO, "got bad img of size(%zu)\n", data.size());
       return;
     }
     ProcessImage(data, timestamp);
diff --git a/tools/cpp/BUILD b/tools/cpp/BUILD
index 053b0e4..a7495d9 100644
--- a/tools/cpp/BUILD
+++ b/tools/cpp/BUILD
@@ -29,6 +29,7 @@
   toolchains = {
     'k8|clang': ':cc-compiler-k8',
     'roborio|gcc': ':cc-compiler-roborio',
+    'armhf-debian|clang': 'cc-compiler-armhf-debian',
   },
 )
 
@@ -122,6 +123,7 @@
     '//tools/cpp/linaro_linux_gcc:clang-ld',
     '//tools/cpp/linaro_linux_gcc:clang',
     '@linaro_linux_gcc_4_9_repo//:compiler_pieces',
+    '//tools/cpp/linaro_linux_gcc:clang-symlinks',
   ],
 )