From 875579ea50fdc6d5ae0adc1beff6e6c9df1bdd8b Mon Sep 17 00:00:00 2001
From: Teguh Hofstee <5227572+hofstee@users.noreply.github.com>
Date: Wed, 22 Apr 2020 05:23:14 -0700
Subject: [PATCH] back.verilog: make Yosys version check compatible with
 Verific.

---
 nmigen/back/verilog.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nmigen/back/verilog.py b/nmigen/back/verilog.py
index eb98a34..6e2185a 100644
--- a/nmigen/back/verilog.py
+++ b/nmigen/back/verilog.py
@@ -16,7 +16,8 @@ class YosysError(Exception):
 def _yosys_version():
     yosys_path = require_tool("yosys")
     version = subprocess.check_output([yosys_path, "-V"], encoding="utf-8")
-    m = re.match(r"^Yosys ([\d.]+)(?:\+(\d+))?", version)
+    # If Yosys is built with Verific, then Verific license information is printed first.
+    m = re.search(r"^Yosys ([\d.]+)(?:\+(\d+))?", version, flags=re.M)
     tag, offset = m[1], m[2] or 0
     return tuple(map(int, tag.split("."))), offset
 
-- 
2.30.2