From f90df7f3ceac962ec342b40ed0a8a6f2080e4cd9 Mon Sep 17 00:00:00 2001
From: qbisi <qbisicwate@gmail.com>
Date: Sat, 4 Oct 2025 09:00:44 +0800
Subject: [PATCH] superlu: fix build with clang21

---
 pkgs/by-name/su/superlu/package.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/by-name/su/superlu/package.nix b/pkgs/by-name/su/superlu/package.nix
index 6b2455c92f37..13c8a51830ca 100644
--- a/pkgs/by-name/su/superlu/package.nix
+++ b/pkgs/by-name/su/superlu/package.nix
@@ -34,6 +34,11 @@ stdenv.mkDerivation (finalAttrs: {
     })
   ];
 
+  # Prevent clang from crashing when compiling slatms.c from SuperLU’s matgen test code.
+  postPatch = lib.optionalString stdenv.cc.isClang ''
+    echo 'target_compile_options(matgen PRIVATE -fno-vectorize)' >> TESTING/MATGEN/CMakeLists.txt
+  '';
+
   nativeBuildInputs = [
     cmake
     ninja