From: Zachary Snow <zach@zachjs.com>
Date: Fri, 1 Oct 2021 20:41:11 +0000 (-0600)
Subject: Specify minimum bison version 3.0+
X-Git-Tag: yosys-0.11~60
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fbd70f28f044968fd59740e34652071c4ee01218;p=yosys.git

Specify minimum bison version 3.0+

Yosys works with bison 3.0 (or newer), but not bison 2.7 (the previous
release). Ideally, we would require "3" rather than "3.0" to give a
better error message, but bison 2.3, which still ships with macOS, does
not support major-only version requirements. With this change, building
with an outdated bison yields: `frontends/rtlil/rtlil_parser.y:25.10-14:
require bison 3.0, but have 2.3`.
---

diff --git a/frontends/rtlil/rtlil_parser.y b/frontends/rtlil/rtlil_parser.y
index 67aeb10e0..7d99b2c42 100644
--- a/frontends/rtlil/rtlil_parser.y
+++ b/frontends/rtlil/rtlil_parser.y
@@ -22,6 +22,8 @@
  *
  */
 
+%require "3.0"
+
 %{
 #include <list>
 #include "frontends/rtlil/rtlil_frontend.h"
diff --git a/frontends/verilog/verilog_parser.y b/frontends/verilog/verilog_parser.y
index 5eb1115ce..171e098a5 100644
--- a/frontends/verilog/verilog_parser.y
+++ b/frontends/verilog/verilog_parser.y
@@ -33,6 +33,8 @@
  *
  */
 
+%require "3.0"
+
 %{
 #include <list>
 #include <stack>