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-rw-r--r--build2/algorithm.cxx26
1 files changed, 26 insertions, 0 deletions
diff --git a/build2/algorithm.cxx b/build2/algorithm.cxx
index 9310644..a55b885 100644
--- a/build2/algorithm.cxx
+++ b/build2/algorithm.cxx
@@ -19,6 +19,32 @@ using namespace butl;
namespace build2
{
+ const target*
+ search_existing (const prerequisite& p)
+ {
+ assert (phase == run_phase::match); // Could be relaxed.
+
+ const target* r (p.target.load (memory_order_consume));
+
+ if (r == nullptr)
+ {
+ const prerequisite_key& pk (p.key ());
+ r = pk.proj ? import_existing (pk) : search_existing_target (pk);
+
+ if (r != nullptr)
+ {
+ const target* e (nullptr);
+ if (!p.target.compare_exchange_strong (
+ e, r,
+ memory_order_release,
+ memory_order_consume))
+ assert (e == r);
+ }
+ }
+
+ return r;
+ }
+
const target&
search (const target& t, const prerequisite_key& pk)
{