1 files changed, 1 insertions, 0 deletions
diff --git a/emcc b/emcc
index ae9423cd..342af478 100755
--- a/emcc
+++ b/emcc
@@ -1272,6 +1272,7 @@ try:
       assert shared.Settings.INIT_HEAP == 0, 'HEAP_INIT is not supported in fastcomp (and should never be needed except for debugging)'
       assert not shared.Settings.RUNTIME_TYPE_INFO, 'RUNTIME_TYPE_INFO is not supported in fastcomp'
       assert not shared.Settings.CORRUPTION_CHECK, 'CORRUPTION_CHECK is not supported in asm.js mode, which is what fastcomp can emit (you can use non-asm.js mode in non-fastcomp)'
+      assert not shared.Settings.MAIN_MODULE and not shared.Settings.SIDE_MODULE, 'Linking modules is not supported in fastcomp'
     except Exception, e:
       logging.error('Compiler settings are incompatible with fastcomp. You can fall back to the older compiler core, although that is not recommended, see https://github.com/kripken/emscripten/wiki/LLVM-Backend')
       raise e