From 3431dc91df992f5b84cc4cfdf0dc5702a2c3107c Mon Sep 17 00:00:00 2001
From: Gaetan Lepage <gaetan@glepage.com>
Date: Sat, 26 Jul 2025 13:45:58 +0200
Subject: [PATCH] yosys: fetch patch to fix amaranth code compilation

Addresses
https://github.com/NixOS/nixpkgs/pull/397611#issuecomment-3121635236
---
 pkgs/by-name/yo/yosys/package.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/by-name/yo/yosys/package.nix b/pkgs/by-name/yo/yosys/package.nix
index 66107035aec5..de1b7f3f5227 100644
--- a/pkgs/by-name/yo/yosys/package.nix
+++ b/pkgs/by-name/yo/yosys/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch2,
 
   # nativeBuildInputs
   bison,
@@ -134,6 +135,14 @@ stdenv.mkDerivation (finalAttrs: {
   makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   patches = [
+    # Backport fix amaranth code compilation
+    # TODO remove when updating to 0.56
+    # https://github.com/YosysHQ/yosys/pull/5182
+    (fetchpatch2 {
+      name = "treat-zero-width-constant-as-zero.patch";
+      url = "https://github.com/YosysHQ/yosys/commit/478b6a2b3fbab0fd4097b841914cbe8bb9f67268.patch";
+      hash = "sha256-KeLoZfkXMk2KIPN9XBQdqWqohywQONlWUIvrGwgphKs=";
+    })
     ./plugin-search-dirs.patch
     ./fix-clang-build.patch
   ];