From bf63d695b804b1c995c7ae4427a8a86936ea6d25 Mon Sep 17 00:00:00 2001
From: Michael Hueschen <m@mhueschen.dev>
Date: Mon, 22 Jan 2024 03:17:05 -0700
Subject: [PATCH] nix: add cc to devShell LD_LIBRARY_PATH

this fixes the error I encountered when trying to run the convert.py
script in a venv:

```
$ nix develop

[...]$ source .venv/bin/activate
(.venv)
[...]$ pip3 install -r requirements.txt
<... clipped ...>
[...]$ python3 ./convert.py
Traceback (most recent call last):
  File "/home/mhueschen/projects-reference/llama.cpp/./convert.py", line 40, in <module>
    from sentencepiece import SentencePieceProcessor
  File "/home/mhueschen/projects-reference/llama.cpp/.venv/lib/python3.11/site-packages/sentencepiece/__init__.py", line 13, in <module>
    from . import _sentencepiece
ImportError: libstdc++.so.6: cannot open shared object file: No such file or directory
```

however, I am not sure this is the cleanest way to address this linker
issue...
---
 .devops/nix/package.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.devops/nix/package.nix b/.devops/nix/package.nix
index c25d99f01..91ddb8890 100644
--- a/.devops/nix/package.nix
+++ b/.devops/nix/package.nix
@@ -221,10 +221,16 @@ effectiveStdenv.mkDerivation (
         ;
 
       shell = mkShell {
+        NIX_LD_LIBRARY_PATH = lib.makeLibraryPath [
+          effectiveStdenv.cc.cc
+        ];
         name = "shell-${finalAttrs.finalPackage.name}";
         description = "contains numpy and sentencepiece";
         buildInputs = [ llama-python ];
         inputsFrom = [ finalAttrs.finalPackage ];
+        shellHook = ''
+          export LD_LIBRARY_PATH=$NIX_LD_LIBRARY_PATH
+        '';
       };
 
       shell-extra = mkShell {