From e872faaec259dbca1797693739eff1dcbedd426d Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sun, 12 Jan 2025 18:58:46 +0000
Subject: [PATCH] talloc: fix pkgsLLVM build

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

diff --git a/pkgs/by-name/ta/talloc/package.nix b/pkgs/by-name/ta/talloc/package.nix
index 2a9395a1c41a..0f617b4b04c6 100644
--- a/pkgs/by-name/ta/talloc/package.nix
+++ b/pkgs/by-name/ta/talloc/package.nix
@@ -67,6 +67,11 @@ stdenv.mkDerivation rec {
   # module, which works correctly in all cases.
   PYTHON_CONFIG = "/invalid";
 
+  # https://reviews.llvm.org/D135402
+  NIX_LDFLAGS = lib.optional (
+    stdenv.cc.bintools.isLLVM && lib.versionAtLeast stdenv.cc.bintools.version "17"
+  ) "--undefined-version";
+
   # this must not be exported before the ConfigurePhase otherwise waf whines
   preBuild = lib.optionalString stdenv.hostPlatform.isMusl ''
     export NIX_CFLAGS_LINK="-no-pie -shared";