From 4dae55fb70de42c2b55676f78ea7f0c6c8ad51b4 Mon Sep 17 00:00:00 2001
From: Christian Pfeiffer <cpfeiffer@live.de>
Date: Tue, 12 Dec 2017 15:15:00 +0100
Subject: IRSL: Fix MSVC variable deferencing

Fixes: #17529
---
 Modules/InstallRequiredSystemLibraries.cmake | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Modules/InstallRequiredSystemLibraries.cmake b/Modules/InstallRequiredSystemLibraries.cmake
index 1ba4877..f62bd09 100644
--- a/Modules/InstallRequiredSystemLibraries.cmake
+++ b/Modules/InstallRequiredSystemLibraries.cmake
@@ -56,10 +56,13 @@
 #   Specify the :command:`install(PROGRAMS)` command ``COMPONENT``
 #   option.  If not specified, no such option will be used.
 
+cmake_policy(PUSH)
+cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
+
 set(_IRSL_HAVE_Intel FALSE)
 set(_IRSL_HAVE_MSVC FALSE)
 foreach(LANG IN ITEMS C CXX Fortran)
-  if(CMAKE_${LANG}_COMPILER_ID STREQUAL Intel)
+  if("${CMAKE_${LANG}_COMPILER_ID}" STREQUAL "Intel")
     if(NOT _IRSL_HAVE_Intel)
       get_filename_component(_Intel_basedir "${CMAKE_${LANG}_COMPILER}" PATH)
       if(CMAKE_SIZEOF_VOID_P EQUAL 8)
@@ -81,7 +84,7 @@ foreach(LANG IN ITEMS C CXX Fortran)
       endif()
       set(_IRSL_HAVE_Intel TRUE)
     endif()
-  elseif(CMAKE_${LANG}_COMPILER_ID STREQUAL MSVC)
+  elseif("${CMAKE_${LANG}_COMPILER_ID}" STREQUAL "MSVC")
     set(_IRSL_HAVE_MSVC TRUE)
   endif()
 endforeach()
@@ -740,3 +743,5 @@ if(CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS)
       )
   endif()
 endif()
+
+cmake_policy(POP)
-- 
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