From ded8563fb360bf5c7b1283236cfaef1772903ee9 Mon Sep 17 00:00:00 2001
From: Kai Harries <kai.harries@posteo.de>
Date: Thu, 21 Dec 2023 12:22:38 +0100
Subject: [PATCH] llama-cpp: assert that only one of the *Support arguments is
 true

When experimenting with llama-cpp I experienced a mysterious build
error that in the end I tracked down to me setting openclSupport and
openblasSupport to true.  To prevent others from this mistake add an
assert that complains if more than one of the arguments openclSupport,
openblasSupport and rocmSupport is set to true.
---
 pkgs/by-name/ll/llama-cpp/package.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/by-name/ll/llama-cpp/package.nix b/pkgs/by-name/ll/llama-cpp/package.nix
index 77a452a26cb0..e82c7467ba7d 100644
--- a/pkgs/by-name/ll/llama-cpp/package.nix
+++ b/pkgs/by-name/ll/llama-cpp/package.nix
@@ -22,6 +22,10 @@
 , pkg-config
 }:
 
+assert lib.assertMsg
+  (lib.count lib.id [openclSupport openblasSupport rocmSupport] == 1)
+  "llama-cpp: exactly one  of openclSupport, openblasSupport and rocmSupport should be enabled";
+
 let
   cudatoolkit_joined = symlinkJoin {
     name = "${cudaPackages.cudatoolkit.name}-merged";