From ffa08d256fa0aaa52afcb05b50f4d4a485d84171 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 13 Mar 2020 14:13:17 -0400
Subject: FindRuby: Fix compatibility with upper-case cache variables

In commit e672db628b (FindRuby: Rename variables to match case of module
name, 2020-03-11) compatibility was provided for result variables but
not for the cache entries that scripts might set.
---
 Modules/FindRuby.cmake | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Modules/FindRuby.cmake b/Modules/FindRuby.cmake
index 87637be..5df242b 100644
--- a/Modules/FindRuby.cmake
+++ b/Modules/FindRuby.cmake
@@ -34,6 +34,22 @@ Also:
   same as Ruby_INCLUDE_DIRS, only provided for compatibility reasons, don't use it
 #]=======================================================================]
 
+# Backwards compatibility
+# Define camel case versions of input variables
+foreach(UPPER
+    RUBY_EXECUTABLE
+    RUBY_LIBRARY
+    RUBY_INCLUDE_DIR
+    RUBY_CONFIG_INCLUDE_DIR
+    )
+    if (DEFINED ${UPPER})
+      string(REPLACE "RUBY_" "Ruby_" Camel ${UPPER})
+        if (NOT DEFINED ${Camel})
+            set(${Camel} ${${UPPER}})
+        endif()
+    endif()
+endforeach()
+
 #   Ruby_ARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"archdir"@:>@)'`
 #   Ruby_SITEARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitearchdir"@:>@)'`
 #   Ruby_SITEDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitelibdir"@:>@)'`
-- 
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