Don't consider mtime of failed to unmatch prerequisite in ad hoc recipe

1 files changed, 2 insertions, 1 deletions

diff --git a/libbuild2/cc/link-rule.cxx b/libbuild2/cc/link-rule.cxx
index 2e644cc..c05522d 100644
--- a/libbuild2/cc/link-rule.cxx
+++ b/libbuild2/cc/link-rule.cxx
@@ -1224,7 +1224,8 @@ namespace build2
       // update them. Note that we have to do it before any further matches
       // since they may rely on these prerequisites already being updated (for
       // example, object file matches may need the headers to be already
-      // updated).
+      // updated). We also must do it after matching all our prerequisite
+      // libraries since they may generate headers that we depend upon.
       //
       // Note that we ignore the result and whether it renders us out of date,
       // leaving it to the common execute logic in perform_update().