custom linker temporal workaround

runner/build.sh

@@ -8,7 +8,7 @@ file=$1
 if [ ${file: -3} == ".rs" ]
 then
     # Rust is compiled with rustc
-    rustc $file -o out/contract.js -O --target wasm32-unknown-emscripten
+    rustc $file -o out/contract.js -O --target wasm32-unknown-emscripten -C linker=./linker_emcc.sh
 
     # Gas injector
     cargo run --manifest-path=./../gas/Cargo.toml --release -- ./out/contract.wasm ./out/contract.wasm

runner/linker_emcc.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+args="$*"
+filtered_args=${args/ERROR_ON_UNDEFINED_SYMBOLS\=1/ERROR_ON_UNDEFINED_SYMBOLS\=0}
+emcc $filtered_args