From b580360ab7795c26dadf94d9c7c292271dd252a5 Mon Sep 17 00:00:00 2001
From: Martin Valgur <martin.valgur@gmail.com>
Date: Mon, 6 Oct 2025 18:45:12 +0300
Subject: [PATCH] base.h: `_BitInt` is not available when Clang is used as a
 host compiler for NVCC (#4564)

---
 include/fmt/base.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/fmt/base.h b/include/fmt/base.h
index 4b687a8f..aaa2f550 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -417,7 +417,11 @@ inline auto map(uint128_opt) -> monostate { return {}; }
 #endif
 
 #ifndef FMT_USE_BITINT
-#  define FMT_USE_BITINT (FMT_CLANG_VERSION >= 1500)
+#  if FMT_CLANG_VERSION >= 1500 && !defined(__CUDACC__)
+#    define FMT_USE_BITINT 1
+#  else
+#    define FMT_USE_BITINT 0
+#  endif
 #endif
 
 #if FMT_USE_BITINT