From 14163d7d6b818ac1add7d467b643abfed8fe7216 Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul@tambre.ee>
Date: Tue, 16 Jun 2020 17:13:56 +0300
Subject: CUDA: Throw error for Clang on Windows

Supporting compiling on Windows is more complicated than initially expected, so
it won't make it into CMake 3.18.
Add a helpful error for users.
---
 Modules/CMakeDetermineCUDACompiler.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Modules/CMakeDetermineCUDACompiler.cmake b/Modules/CMakeDetermineCUDACompiler.cmake
index a0f7202..e12da45 100644
--- a/Modules/CMakeDetermineCUDACompiler.cmake
+++ b/Modules/CMakeDetermineCUDACompiler.cmake
@@ -198,6 +198,10 @@ if(NOT CMAKE_CUDA_COMPILER_ID_RUN)
       string(APPEND nvcc_test_flags " -ccbin=${CMAKE_CUDA_HOST_COMPILER}")
     endif()
   elseif(CMAKE_CUDA_COMPILER_ID STREQUAL "Clang")
+    if(WIN32)
+      message(FATAL_ERROR "Clang with CUDA is not yet supported on Windows. See CMake issue #20776.")
+    endif()
+
     set(clang_test_flags "--cuda-path=\"${CMAKE_CUDA_COMPILER_LIBRARY_ROOT}\"")
     if(CMAKE_CROSSCOMPILING)
       # Need to pass the host target and include directories if we're crosscompiling.
-- 
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