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-rw-r--r--passes/techmap/abc9.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/passes/techmap/abc9.cc b/passes/techmap/abc9.cc
index 7418ed4a3..da376d09e 100644
--- a/passes/techmap/abc9.cc
+++ b/passes/techmap/abc9.cc
@@ -741,7 +741,7 @@ void abc9_module(RTLIL::Design *design, RTLIL::Module *current_module, std::stri
for (auto driver_cell : bit_drivers.at(it.first))
for (auto user_cell : it.second)
toposort.edge(driver_cell, user_cell);
- bool no_loops = toposort.sort();
+ bool no_loops YS_ATTRIBUTE(unused) = toposort.sort();
log_assert(no_loops);
for (auto ii = toposort.sorted.rbegin(); ii != toposort.sorted.rend(); ii++) {