only emit aborting function stubs on undefined symbols in asm mode

1 files changed, 8 insertions, 2 deletions

diff --git a/src/jsifier.js b/src/jsifier.js
index 24fded72..46d8ae74 100644
--- a/src/jsifier.js
+++ b/src/jsifier.js
@@ -486,12 +486,18 @@ function JSify(data, functionsOnly, givenFunctions) {
         item.JS = '';
       } else {
         // If this is not linkable, anything not in the library is definitely missing
+        var cancel = false;
         if (!LINKABLE && !LibraryManager.library.hasOwnProperty(shortident) && !LibraryManager.library.hasOwnProperty(shortident + '__inline')) {
           if (ERROR_ON_UNDEFINED_SYMBOLS) error('unresolved symbol: ' + shortident);
           if (VERBOSE || WARN_ON_UNDEFINED_SYMBOLS) printErr('warning: unresolved symbol: ' + shortident);
-          LibraryManager.library[shortident] = new Function("Module['printErr']('missing function: " + shortident + "'); abort(-1);");
+          if (ASM_JS) {
+            // emit a stub that will fail during runtime. this allows asm validation to succeed.
+            LibraryManager.library[shortident] = new Function("Module['printErr']('missing function: " + shortident + "'); abort(-1);");
+          } else {
+            cancel = true; // emit nothing, not even  var X = undefined;
+          }
         }
-        item.JS = addFromLibrary(shortident);
+        item.JS = cancel ? ';' : addFromLibrary(shortident);
       }
       return ret;
     }