From 627e7ea547a54f36db364b92f72a702092faab90 Mon Sep 17 00:00:00 2001
From: YRabbit <rabbit@yrabbit.cyou>
Date: Tue, 20 Jan 2026 14:28:47 +1000
Subject: [PATCH] Gowin. Ignore empty lines.

Including those containing nothing but spaces and tabs.

Fixes https://github.com/YosysHQ/apicula/issues/432

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
---
 himbaechel/uarch/gowin/cst.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/himbaechel/uarch/gowin/cst.cc b/himbaechel/uarch/gowin/cst.cc
index c9097850..ca4ad496 100644
--- a/himbaechel/uarch/gowin/cst.cc
+++ b/himbaechel/uarch/gowin/cst.cc
@@ -112,6 +112,11 @@ struct GowinCstReader
 
             while (!in.eof()) {
                 std::getline(in, line);
+                boost::trim_right(line);
+                if (line.empty()) {
+                    continue;
+                }
+
                 cst_type = ioloc;
                 if (!std::regex_match(line, match, iobre)) {
                     if (std::regex_match(line, match, portre)) {