Auto merge of #43344 - tlively:wasm-debug, r=alexcrichton

Pass debugging arguments to emcc Tells emcc to enable assertions and debugging information for wasm32-experimental-emscripten. This makes the codegen issues caused by LLVM bug 33824 manifest more frequently at runtime and improves the wasm debugging experience.
rust-lang · Jul 22, 2017 · e49a948 · e49a948
2 parents 066a0ae + 6a3e322
commit e49a948
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/librustc_back/target/wasm32_experimental_emscripten.rs b/src/librustc_back/target/wasm32_experimental_emscripten.rs
@@ -18,7 +18,10 @@ pub fn target() -> Result<Target, String> {
                           vec!["-s".to_string(),
                                "WASM=1".to_string(),
                                "-s".to_string(),
-                               "ERROR_ON_UNDEFINED_SYMBOLS=1".to_string()]);
+                               "ASSERTIONS=1".to_string(),
+                               "-s".to_string(),
+                               "ERROR_ON_UNDEFINED_SYMBOLS=1".to_string(),
+                               "-g3".to_string()]);
 
     let opts = TargetOptions {
         linker: cmd("emcc"),