forward only -Ox to source compilation in test runner

1 files changed, 3 insertions, 1 deletions

diff --git a/tests/runner.py b/tests/runner.py
index a6456055..d73be48b 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -10040,7 +10040,9 @@ class %s(T):
       Building.LLVM_OPTS = 0
       if '-O2' in self.emcc_args:
         Building.COMPILER_TEST_OPTS = [] # remove -g in -O2 tests, for more coverage
-      Building.COMPILER_TEST_OPTS += self.emcc_args # so bitcode is optimized too, this is for cpp to ll
+      for arg in self.emcc_args:
+        if arg.startswith('-O'):
+          Building.COMPILER_TEST_OPTS.append(arg) # so bitcode is optimized too, this is for cpp to ll
       return
 
     embetter = %d