[clang] [clang] [CUDA] Support calling consteval function between different target. (PR #158688)

[Tang Jiajun via cfe-commits]

https://github.com/tangjj11 created https://github.com/llvm/llvm-project/pull/158688

None

>From bea389e7b7706470ec021cf027f6433ed2b16774 Mon Sep 17 00:00:00 2001
From: tangjj11 <1220586548 at qq.com>
Date: Mon, 15 Sep 2025 22:57:52 +0800
Subject: [PATCH] [clang] [CUDA] Support calling consteval function between
 different target.

---
 clang/lib/Sema/SemaCUDA.cpp           | 3 +++
 clang/test/SemaCUDA/consteval-func.cu | 8 ++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 clang/test/SemaCUDA/consteval-func.cu

diff --git a/clang/lib/Sema/SemaCUDA.cpp b/clang/lib/Sema/SemaCUDA.cpp
index 0e1bf727d72d2..6c564383f0563 100644
--- a/clang/lib/Sema/SemaCUDA.cpp
+++ b/clang/lib/Sema/SemaCUDA.cpp
@@ -143,6 +143,9 @@ CUDAFunctionTarget SemaCUDA::IdentifyTarget(const FunctionDecl *D,
   if (D->hasAttr<CUDAGlobalAttr>())
     return CUDAFunctionTarget::Global;
 
+  if (D->isConsteval())
+    return CUDAFunctionTarget::HostDevice;
+
   if (hasAttr<CUDADeviceAttr>(D, IgnoreImplicitHDAttr)) {
     if (hasAttr<CUDAHostAttr>(D, IgnoreImplicitHDAttr))
       return CUDAFunctionTarget::HostDevice;
diff --git a/clang/test/SemaCUDA/consteval-func.cu b/clang/test/SemaCUDA/consteval-func.cu
new file mode 100644
index 0000000000000..293c1ce85830a
--- /dev/null
+++ b/clang/test/SemaCUDA/consteval-func.cu
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -std=c++20 -fsyntax-only -verify %s
+
+// expected-no-diagnostics
+
+#include "Inputs/cuda.h"
+
+__device__ consteval int f() { return 0; }
+int main() { return f(); }