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-rw-r--r--libbuild2/target.ixx2
1 files changed, 2 insertions, 0 deletions
diff --git a/libbuild2/target.ixx b/libbuild2/target.ixx
index 69b2776..39b81e7 100644
--- a/libbuild2/target.ixx
+++ b/libbuild2/target.ixx
@@ -769,6 +769,8 @@ namespace build2
inline bool mtime_target::
newer (timestamp mt, target_state s) const
{
+ assert (s != target_state::unknown); // Should be executed.
+
timestamp mp (mtime ());
// What do we do if timestamps are equal? This can happen, for example,