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-rw-r--r--Source/cmGeneratorExpressionDAGChecker.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/cmGeneratorExpressionDAGChecker.h b/Source/cmGeneratorExpressionDAGChecker.h
index e1fba5e..6d7d6ef 100644
--- a/Source/cmGeneratorExpressionDAGChecker.h
+++ b/Source/cmGeneratorExpressionDAGChecker.h
@@ -88,7 +88,7 @@ private:
const cmGeneratorExpressionDAGChecker* const Parent;
cmGeneratorTarget const* Target;
const std::string Property;
- std::map<cmGeneratorTarget const*, std::set<std::string>> Seen;
+ mutable std::map<cmGeneratorTarget const*, std::set<std::string>> Seen;
const GeneratorExpressionContent* const Content;
const cmListFileBacktrace Backtrace;
Result CheckResult;