[Chromecast] Only include all libstdc++/libgcc symbols in executable as needed

build/config/chromecast/BUILD.gn

Index: build/config/chromecast/BUILD.gn
diff --git a/build/config/chromecast/BUILD.gn b/build/config/chromecast/BUILD.gn
index f1cbfe61946fb68e18ab195dc1e3e9aae4012ad7..848033cc367db9da4236420b0b4d30adbeb58345 100644
--- a/build/config/chromecast/BUILD.gn
+++ b/build/config/chromecast/BUILD.gn
@@ -34,6 +34,20 @@ config("ldconfig") {
   ]
 }
 
+# whole archiving libgcc.a and libstdc++ is needed if dynamic share libs are
+# used, see b/25566835
+config("executable_whole_archive_config") {
+  if (current_cpu == "arm") {
+    ldflags = [
+      # adding all symbols from libgcc and libstdc++
+      "-Wl,--whole-archive",
+      "-l:libstdc++.a",
+      "-l:libgcc.a",
+      "-Wl,--no-whole-archive",
+    ]
+  }
+}
+
 config("executable_config") {
   configs = [ ":ldconfig" ]
 
@@ -47,11 +61,6 @@ config("executable_config") {
 
       # In case we redefined stdlibc++ symbols (e.g. tc_malloc)
       "-Wl,--allow-multiple-definition",
-
-      "-Wl,--whole-archive",
-      "-l:libstdc++.a",
-      "-l:libgcc.a",
-      "-Wl,--no-whole-archive",
     ]
 
     # Despite including libstdc++/libgcc archives, we still need to specify