From b03f73653f247747b987fd5c130374ccce7da4cb Mon Sep 17 00:00:00 2001
From: Akash Levy <akash@silimate.com>
Date: Sun, 1 Mar 2026 21:43:26 -0800
Subject: [PATCH] Update abc to fix bug

---
 passes/techmap/abc.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/passes/techmap/abc.cc b/passes/techmap/abc.cc
index 7a5e849d4..9e8e3f3a2 100644
--- a/passes/techmap/abc.cc
+++ b/passes/techmap/abc.cc
@@ -188,8 +188,11 @@ struct AbcProcess
 	~AbcProcess() {
 		if (pid == 0)
 			return;
-		if (to_child_pipe >= 0)
+		if (to_child_pipe >= 0) {
+			static const char quit_cmd[] = "quit\n";
+			if (write(to_child_pipe, quit_cmd, sizeof(quit_cmd) - 1)) {}
 			close(to_child_pipe);
+		}
 		int status;
 		int ret = waitpid(pid, &status, 0);
 		if (ret != pid) {