From 7077a554f14ad1cc5682d6bc8c2d05d1aff2a270 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 25 Oct 2017 07:27:43 -0400
Subject: Clang: Use -TP flag for C++ sources with clang-cl

We do this for `cl`, so we should do it for `clang-cl`.

Fixes: #17394
---
 Modules/Platform/Windows-Clang-CXX.cmake | 1 +
 Modules/Platform/Windows-Clang.cmake     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Modules/Platform/Windows-Clang-CXX.cmake b/Modules/Platform/Windows-Clang-CXX.cmake
index 2c3688a..f1d40f2 100644
--- a/Modules/Platform/Windows-Clang-CXX.cmake
+++ b/Modules/Platform/Windows-Clang-CXX.cmake
@@ -1,2 +1,3 @@
 include(Platform/Windows-Clang)
+set(_COMPILE_CXX_MSVC " -TP")
 __windows_compiler_clang(CXX)
diff --git a/Modules/Platform/Windows-Clang.cmake b/Modules/Platform/Windows-Clang.cmake
index bcfda93..007ae53 100644
--- a/Modules/Platform/Windows-Clang.cmake
+++ b/Modules/Platform/Windows-Clang.cmake
@@ -12,6 +12,7 @@ if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
     OR "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
   include(Platform/Windows-MSVC)
   macro(__windows_compiler_clang lang)
+    set(_COMPILE_${lang} "${_COMPILE_${lang}_MSVC}")
     __windows_compiler_msvc(${lang})
   endmacro()
 else()
-- 
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