From 42949532a350cd490e3752ad476cf76cf28163b9 Mon Sep 17 00:00:00 2001
From: Hermes <hermes@lazyworkhorse.net>
Date: Fri, 19 Jun 2026 12:09:33 -0400
Subject: [PATCH] fix: set CC=gcc for clamav Rust proc-macro builds in
 cross-compile

---
 flake.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/flake.nix b/flake.nix
index 04005ec..63d4bc2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -193,6 +193,13 @@
             "-Dtest_run_result=0"
             "-Dtest_run_result__TRYRUN_OUTPUT="
           ];
+          # Rust proc-macro build scripts need a native linker; cmake overrides
+          # CC/CXX to the cross-compiler, confusing cargo. Set CC to native gcc
+          # so proc-macros can compile and run on the build host.
+          preConfigure = (old.preConfigure or "") + ''
+            export CC=gcc
+            export CXX=g++
+          '';
         });
       };