gn build: Make sync script not exit 1 if it writes changes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369571 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/gn/build/sync_source_lists_from_cmake.py b/utils/gn/build/sync_source_lists_from_cmake.py
index bd321d15c7fb05df964a09698b2e276fc4287ce8..5063f71a826bad4a25c4a13db0fcea43e6f03e4e 100755 (executable)
--- a/utils/gn/build/sync_source_lists_from_cmake.py
+++ b/utils/gn/build/sync_source_lists_from_cmake.py
@@ -124,7 +124,7 @@ def sync_source_lists(write):
         else:
             print()
 
-    return bool(changes_by_rev)
+    return bool(changes_by_rev) and not write
 
 
 def sync_unittests():