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-rw-r--r--llvm/tools/opt-viewer/optpmap.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/tools/opt-viewer/optpmap.py b/llvm/tools/opt-viewer/optpmap.py
index db6b079b3a6..ff3e683f3d0 100644
--- a/llvm/tools/opt-viewer/optpmap.py
+++ b/llvm/tools/opt-viewer/optpmap.py
@@ -42,7 +42,7 @@ def pmap(func, iterable, processes, should_print_progress, *args, **kwargs):
func_and_args = [(func, arg, should_print_progress,) for arg in iterable]
if processes == 1:
- result = map(_wrapped_func, func_and_args, *args, **kwargs)
+ result = list(map(_wrapped_func, func_and_args, *args, **kwargs))
else:
pool = multiprocessing.Pool(initializer=_init,
initargs=(_current, _total,),
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