From 55b7234d21be0c1683ea691b27b46333e219cd5a Mon Sep 17 00:00:00 2001
From: Pascal <admin@serveurperso.com>
Date: Sun, 17 May 2026 14:41:39 +0200
Subject: [PATCH] cmake: scope /utf-8 to C and C++ so nvcc does not treat it as
 an input file

---
 CMakeLists.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c63d3ff..8206fd2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,10 +22,13 @@ find_package(Threads REQUIRED)
 # Suppress MSVC fopen/sprintf deprecation warnings, force UTF-8 source and
 # execution charsets so non-ASCII string literals (CJK language names,
 # punctuation tables in BPE and prompt builder) survive the compile
-# without a BOM.
+# without a BOM. /utf-8 is restricted to C and C++ since nvcc treats a
+# bare /utf-8 as an input filename and aborts with "A single input file
+# is required". CUDA sources do not carry CJK literals so they do not
+# need this flag.
 if(MSVC)
     add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
-    add_compile_options(/utf-8)
+    add_compile_options($<$<COMPILE_LANGUAGE:C,CXX>:/utf-8>)
 endif()
 
 # Put executables and backend .so in the same directory (build root).