From 39534c58c5d3b525c53f4be572e1b72b53eac220 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 5 Oct 2018 10:19:26 -0400
Subject: Autogen: Add clang --target= flag to compiler predefines command

Respect the compiler target value `CMAKE_<LANG>_COMPILER_TARGET` in
`CMAKE_<LANG>_COMPILER_PREDEFINES_COMMAND`.

Issue: #18425
---
 Modules/Compiler/Clang.cmake | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake
index 1653b55..e23470b 100644
--- a/Modules/Compiler/Clang.cmake
+++ b/Modules/Compiler/Clang.cmake
@@ -33,6 +33,14 @@ else()
     set(CMAKE_${lang}_LINKER_WRAPPER_FLAG "-Xlinker" " ")
     set(CMAKE_${lang}_LINKER_WRAPPER_FLAG_SEP)
 
+    if(CMAKE_${lang}_COMPILER_TARGET)
+      if(CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4.0)
+        list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-target" "${CMAKE_${lang}_COMPILER_TARGET}")
+      else()
+        list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "--target=${CMAKE_${lang}_COMPILER_TARGET}")
+      endif()
+    endif()
+
     set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
     set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
 
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