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-rw-r--r--build2/variable.hxx3
1 files changed, 3 insertions, 0 deletions
diff --git a/build2/variable.hxx b/build2/variable.hxx
index e45914a..9688944 100644
--- a/build2/variable.hxx
+++ b/build2/variable.hxx
@@ -1227,6 +1227,9 @@ namespace build2
size_t version = 0; // Incremented on each modification (variable_cache).
};
+ // Note that we guarantee ascending iteration order (e.g., for predictable
+ // dump output in tests).
+ //
using map_type = butl::prefix_map<reference_wrapper<const variable>,
value_data,
'.'>;