From 35f3927af32c9c077c7df7a35de76a5e6fdb6149 Mon Sep 17 00:00:00 2001
From: David Bayer <48736217+davebayer@users.noreply.github.com>
Date: Mon, 16 Mar 2026 15:23:22 +0100
Subject: [PATCH] Add fallback for `_CCCL_BUILTIN_EXPECT` (#8043)

(cherry picked from commit 5c44b159d03986a1d6c468343a95045278e61d86)
---
 libcudacxx/include/cuda/std/__cccl/builtin.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libcudacxx/include/cuda/std/__cccl/builtin.h b/libcudacxx/include/cuda/std/__cccl/builtin.h
index 0ab81891842..5086f175e2b 100644
--- a/libcudacxx/include/cuda/std/__cccl/builtin.h
+++ b/libcudacxx/include/cuda/std/__cccl/builtin.h
@@ -115,8 +115,10 @@
 #endif // _CCCL_CHECK_BUILTIN(builtin_constant_p)
 
 #if _CCCL_CHECK_BUILTIN(builtin_expect) || _CCCL_COMPILER(MSVC) || _CCCL_COMPILER(GCC)
-#  define _CCCL_BUILTIN_EXPECT(...) __builtin_expect(__VA_ARGS__)
-#endif // _CCCL_CHECK_BUILTIN(builtin_expect)
+#  define _CCCL_BUILTIN_EXPECT(_EXPR, _VAL) __builtin_expect(_EXPR, _VAL)
+#else // ^^^ has __builtin_expect ^^^ / vvv no __builtin_expect vvv
+#  define _CCCL_BUILTIN_EXPECT(_EXPR, _VAL) (_EXPR)
+#endif // ^^^ no __builtin_expect ^^^
 
 #if _CCCL_CHECK_BUILTIN(builtin_huge_valf) || _CCCL_COMPILER(MSVC) || _CCCL_COMPILER(GCC, <, 10)
 #  define _CCCL_BUILTIN_HUGE_VALF() __builtin_huge_valf()