From 23a52561c73638fe865c71ed3ddd9457524a5a85 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 17 May 2022 11:08:21 -0400
Subject: Clang: Use -imsvc flag without space to support Clang tools

Since commit bb61c2d024 (Clang: use -imsvc for system include dirs when
running on Windows, 2020-09-16, v3.19.0-rc1~162^2) we use the `-imsvc`
flag followed by the include directory as a separate argument.  Some
versions of `clang-tidy` do not support the flag unless the include
directory is attached to it, so use that form instead.

A similar fix was made by commit 3a8b6653dc (MSVC: Use -external:I flag
without space to support Clang tools, 2022-01-11, v3.22.2~8^2).

Fixes: #23517
---
 Modules/Platform/Windows-Clang.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/Platform/Windows-Clang.cmake b/Modules/Platform/Windows-Clang.cmake
index e7e975d..4d3de0e 100644
--- a/Modules/Platform/Windows-Clang.cmake
+++ b/Modules/Platform/Windows-Clang.cmake
@@ -182,7 +182,7 @@ if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
     macro(__windows_compiler_clang_base lang)
       set(_COMPILE_${lang} "${_COMPILE_${lang}_MSVC}")
       __windows_compiler_msvc(${lang})
-      set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-imsvc ")
+      set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-imsvc")
     endmacro()
   else()
     cmake_policy(GET CMP0091 __WINDOWS_CLANG_CMP0091)
-- 
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