FindRuby: Rename variables to match case of module name

Use recommended case for variable names, i.e. matching name of the
module as passed to `find_package`.

For backwards compatibility, the upper case versions of both input and
output variables are used and defined when appropriate.  Skip this for
the _FOUND variable because FPHSA already does it.

This follows the approach from commit a7b09e7f43 (FindProtobuf: Rename
variables to match case of module name, 2016-03-01, v3.6.0-rc1~273^2).

Issue: #20370

1 files changed, 185 insertions, 157 deletions

diff --git a/Modules/FindRuby.cmake b/Modules/FindRuby.cmake
index 7e01fbc..6918aed 100644
--- a/Modules/FindRuby.cmake
+++ b/Modules/FindRuby.cmake
@@ -17,279 +17,307 @@ standard syntax, e.g.  find_package(Ruby 1.8)
 It also determines what the name of the library is.  This code sets
 the following variables:
 
-``RUBY_EXECUTABLE``
+``Ruby_EXECUTABLE``
   full path to the ruby binary
-``RUBY_INCLUDE_DIRS``
+``Ruby_INCLUDE_DIRS``
   include dirs to be used when using the ruby library
-``RUBY_LIBRARY``
+``Ruby_LIBARY``
   full path to the ruby library
-``RUBY_VERSION``
+``Ruby_VERSION``
   the version of ruby which was found, e.g. "1.8.7"
-``RUBY_FOUND``
+``Ruby_FOUND``
   set to true if ruby ws found successfully
 
 Also:
 
-``RUBY_INCLUDE_PATH``
-  same as RUBY_INCLUDE_DIRS, only provided for compatibility reasons, don't use it
+``Ruby_INCLUDE_PATH``
+  same as Ruby_INCLUDE_DIRS, only provided for compatibility reasons, don't use it
 #]=======================================================================]
 
-#   RUBY_ARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"archdir"@:>@)'`
-#   RUBY_SITEARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitearchdir"@:>@)'`
-#   RUBY_SITEDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitelibdir"@:>@)'`
-#   RUBY_LIBDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"libdir"@:>@)'`
-#   RUBY_LIBRUBYARG=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"LIBRUBYARG_SHARED"@:>@)'`
+#   Ruby_ARCHDIR=`$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"@:>@)'`
+#   Ruby_LIBDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"libdir"@:>@)'`
+#   Ruby_LIBRUBYARG=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"LIBRUBYARG_SHARED"@:>@)'`
 
 # uncomment the following line to get debug output for this file
-# set(_RUBY_DEBUG_OUTPUT TRUE)
+# set(_Ruby_DEBUG_OUTPUT TRUE)
 
 # Determine the list of possible names of the ruby executable depending
 # on which version of ruby is required
-set(_RUBY_POSSIBLE_EXECUTABLE_NAMES ruby)
+set(_Ruby_POSSIBLE_EXECUTABLE_NAMES ruby)
 
 # if 1.9 is required, don't look for ruby18 and ruby1.8, default to version 1.8
 if(DEFINED Ruby_FIND_VERSION_MAJOR AND DEFINED Ruby_FIND_VERSION_MINOR)
-  set(Ruby_FIND_VERSION_SHORT_NODOT "${Ruby_FIND_VERSION_MAJOR}${RUBY_FIND_VERSION_MINOR}")
+  set(Ruby_FIND_VERSION_SHORT_NODOT "${Ruby_FIND_VERSION_MAJOR}${Ruby_FIND_VERSION_MINOR}")
   # we can't construct that if only major version is given
-  set(_RUBY_POSSIBLE_EXECUTABLE_NAMES
+  set(_Ruby_POSSIBLE_EXECUTABLE_NAMES
     ruby${Ruby_FIND_VERSION_MAJOR}.${Ruby_FIND_VERSION_MINOR}
     ruby${Ruby_FIND_VERSION_MAJOR}${Ruby_FIND_VERSION_MINOR}
-    ${_RUBY_POSSIBLE_EXECUTABLE_NAMES})
+    ${_Ruby_POSSIBLE_EXECUTABLE_NAMES})
 else()
   set(Ruby_FIND_VERSION_SHORT_NODOT "18")
 endif()
 
 if(NOT Ruby_FIND_VERSION_EXACT)
-  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.4 ruby24)
-  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.3 ruby23)
-  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.2 ruby22)
-  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.1 ruby21)
-  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.0 ruby20)
-  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.9 ruby19)
+  list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby2.4 ruby24)
+  list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby2.3 ruby23)
+  list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby2.2 ruby22)
+  list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby2.1 ruby21)
+  list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby2.0 ruby20)
+  list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby1.9 ruby19)
 
   # if we want a version below 1.9, also look for ruby 1.8
   if("${Ruby_FIND_VERSION_SHORT_NODOT}" VERSION_LESS "19")
-    list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.8 ruby18)
+    list(APPEND _Ruby_POSSIBLE_EXECUTABLE_NAMES ruby1.8 ruby18)
   endif()
 
-  list(REMOVE_DUPLICATES _RUBY_POSSIBLE_EXECUTABLE_NAMES)
+  list(REMOVE_DUPLICATES _Ruby_POSSIBLE_EXECUTABLE_NAMES)
 endif()
 
-find_program(RUBY_EXECUTABLE NAMES ${_RUBY_POSSIBLE_EXECUTABLE_NAMES})
+find_program(Ruby_EXECUTABLE NAMES ${_Ruby_POSSIBLE_EXECUTABLE_NAMES})
 
-if(RUBY_EXECUTABLE  AND NOT  RUBY_VERSION_MAJOR)
+if(Ruby_EXECUTABLE  AND NOT  Ruby_VERSION_MAJOR)
   function(_RUBY_CONFIG_VAR RBVAR OUTVAR)
-    execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['${RBVAR}']"
-      RESULT_VARIABLE _RUBY_SUCCESS
-      OUTPUT_VARIABLE _RUBY_OUTPUT
+    execute_process(COMMAND ${Ruby_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['${RBVAR}']"
+      RESULT_VARIABLE _Ruby_SUCCESS
+      OUTPUT_VARIABLE _Ruby_OUTPUT
       ERROR_QUIET)
-    if(_RUBY_SUCCESS OR _RUBY_OUTPUT STREQUAL "")
-      execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['${RBVAR}']"
-        RESULT_VARIABLE _RUBY_SUCCESS
-        OUTPUT_VARIABLE _RUBY_OUTPUT
+    if(_Ruby_SUCCESS OR _Ruby_OUTPUT STREQUAL "")
+      execute_process(COMMAND ${Ruby_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['${RBVAR}']"
+        RESULT_VARIABLE _Ruby_SUCCESS
+        OUTPUT_VARIABLE _Ruby_OUTPUT
         ERROR_QUIET)
     endif()
-    set(${OUTVAR} "${_RUBY_OUTPUT}" PARENT_SCOPE)
+    set(${OUTVAR} "${_Ruby_OUTPUT}" PARENT_SCOPE)
   endfunction()
 
 
   # query the ruby version
-  _RUBY_CONFIG_VAR("MAJOR" RUBY_VERSION_MAJOR)
-  _RUBY_CONFIG_VAR("MINOR" RUBY_VERSION_MINOR)
-  _RUBY_CONFIG_VAR("TEENY" RUBY_VERSION_PATCH)
+  _RUBY_CONFIG_VAR("MAJOR" Ruby_VERSION_MAJOR)
+  _RUBY_CONFIG_VAR("MINOR" Ruby_VERSION_MINOR)
+  _RUBY_CONFIG_VAR("TEENY" Ruby_VERSION_PATCH)
 
   # query the different directories
-  _RUBY_CONFIG_VAR("archdir" RUBY_ARCH_DIR)
-  _RUBY_CONFIG_VAR("arch" RUBY_ARCH)
-  _RUBY_CONFIG_VAR("rubyhdrdir" RUBY_HDR_DIR)
-  _RUBY_CONFIG_VAR("rubyarchhdrdir" RUBY_ARCHHDR_DIR)
-  _RUBY_CONFIG_VAR("libdir" RUBY_POSSIBLE_LIB_DIR)
-  _RUBY_CONFIG_VAR("rubylibdir" RUBY_RUBY_LIB_DIR)
+  _RUBY_CONFIG_VAR("archdir" Ruby_ARCH_DIR)
+  _RUBY_CONFIG_VAR("arch" Ruby_ARCH)
+  _RUBY_CONFIG_VAR("rubyhdrdir" Ruby_HDR_DIR)
+  _RUBY_CONFIG_VAR("rubyarchhdrdir" Ruby_ARCHHDR_DIR)
+  _RUBY_CONFIG_VAR("libdir" Ruby_POSSIBLE_LIB_DIR)
+  _RUBY_CONFIG_VAR("rubylibdir" Ruby_RUBY_LIB_DIR)
 
   # site_ruby
-  _RUBY_CONFIG_VAR("sitearchdir" RUBY_SITEARCH_DIR)
-  _RUBY_CONFIG_VAR("sitelibdir" RUBY_SITELIB_DIR)
+  _RUBY_CONFIG_VAR("sitearchdir" Ruby_SITEARCH_DIR)
+  _RUBY_CONFIG_VAR("sitelibdir" Ruby_SITELIB_DIR)
 
   # vendor_ruby available ?
-  execute_process(COMMAND ${RUBY_EXECUTABLE} -r vendor-specific -e "print 'true'"
-    OUTPUT_VARIABLE RUBY_HAS_VENDOR_RUBY  ERROR_QUIET)
+  execute_process(COMMAND ${Ruby_EXECUTABLE} -r vendor-specific -e "print 'true'"
+    OUTPUT_VARIABLE Ruby_HAS_VENDOR_RUBY  ERROR_QUIET)
 
-  if(RUBY_HAS_VENDOR_RUBY)
-    _RUBY_CONFIG_VAR("vendorlibdir" RUBY_VENDORLIB_DIR)
-    _RUBY_CONFIG_VAR("vendorarchdir" RUBY_VENDORARCH_DIR)
+  if(Ruby_HAS_VENDOR_RUBY)
+    _RUBY_CONFIG_VAR("vendorlibdir" Ruby_VENDORLIB_DIR)
+    _RUBY_CONFIG_VAR("vendorarchdir" Ruby_VENDORARCH_DIR)
   endif()
 
   # save the results in the cache so we don't have to run ruby the next time again
-  set(RUBY_VERSION_MAJOR    ${RUBY_VERSION_MAJOR}    CACHE PATH "The Ruby major version" FORCE)
-  set(RUBY_VERSION_MINOR    ${RUBY_VERSION_MINOR}    CACHE PATH "The Ruby minor version" FORCE)
-  set(RUBY_VERSION_PATCH    ${RUBY_VERSION_PATCH}    CACHE PATH "The Ruby patch version" FORCE)
-  set(RUBY_ARCH_DIR         ${RUBY_ARCH_DIR}         CACHE PATH "The Ruby arch dir" FORCE)
-  set(RUBY_HDR_DIR          ${RUBY_HDR_DIR}          CACHE PATH "The Ruby header dir (1.9+)" FORCE)
-  set(RUBY_ARCHHDR_DIR      ${RUBY_ARCHHDR_DIR}      CACHE PATH "The Ruby arch header dir (2.0+)" FORCE)
-  set(RUBY_POSSIBLE_LIB_DIR ${RUBY_POSSIBLE_LIB_DIR} CACHE PATH "The Ruby lib dir" FORCE)
-  set(RUBY_RUBY_LIB_DIR     ${RUBY_RUBY_LIB_DIR}     CACHE PATH "The Ruby ruby-lib dir" FORCE)
-  set(RUBY_SITEARCH_DIR     ${RUBY_SITEARCH_DIR}     CACHE PATH "The Ruby site arch dir" FORCE)
-  set(RUBY_SITELIB_DIR      ${RUBY_SITELIB_DIR}      CACHE PATH "The Ruby site lib dir" FORCE)
-  set(RUBY_HAS_VENDOR_RUBY  ${RUBY_HAS_VENDOR_RUBY}  CACHE BOOL "Vendor Ruby is available" FORCE)
-  set(RUBY_VENDORARCH_DIR   ${RUBY_VENDORARCH_DIR}   CACHE PATH "The Ruby vendor arch dir" FORCE)
-  set(RUBY_VENDORLIB_DIR    ${RUBY_VENDORLIB_DIR}    CACHE PATH "The Ruby vendor lib dir" FORCE)
+  set(Ruby_VERSION_MAJOR    ${Ruby_VERSION_MAJOR}    CACHE PATH "The Ruby major version" FORCE)
+  set(Ruby_VERSION_MINOR    ${Ruby_VERSION_MINOR}    CACHE PATH "The Ruby minor version" FORCE)
+  set(Ruby_VERSION_PATCH    ${Ruby_VERSION_PATCH}    CACHE PATH "The Ruby patch version" FORCE)
+  set(Ruby_ARCH_DIR         ${Ruby_ARCH_DIR}         CACHE PATH "The Ruby arch dir" FORCE)
+  set(Ruby_HDR_DIR          ${Ruby_HDR_DIR}          CACHE PATH "The Ruby header dir (1.9+)" FORCE)
+  set(Ruby_ARCHHDR_DIR      ${Ruby_ARCHHDR_DIR}      CACHE PATH "The Ruby arch header dir (2.0+)" FORCE)
+  set(Ruby_POSSIBLE_LIB_DIR ${Ruby_POSSIBLE_LIB_DIR} CACHE PATH "The Ruby lib dir" FORCE)
+  set(Ruby_RUBY_LIB_DIR     ${Ruby_RUBY_LIB_DIR}     CACHE PATH "The Ruby ruby-lib dir" FORCE)
+  set(Ruby_SITEARCH_DIR     ${Ruby_SITEARCH_DIR}     CACHE PATH "The Ruby site arch dir" FORCE)
+  set(Ruby_SITELIB_DIR      ${Ruby_SITELIB_DIR}      CACHE PATH "The Ruby site lib dir" FORCE)
+  set(Ruby_HAS_VENDOR_RUBY  ${Ruby_HAS_VENDOR_RUBY}  CACHE BOOL "Vendor Ruby is available" FORCE)
+  set(Ruby_VENDORARCH_DIR   ${Ruby_VENDORARCH_DIR}   CACHE PATH "The Ruby vendor arch dir" FORCE)
+  set(Ruby_VENDORLIB_DIR    ${Ruby_VENDORLIB_DIR}    CACHE PATH "The Ruby vendor lib dir" FORCE)
 
   mark_as_advanced(
-    RUBY_ARCH_DIR
-    RUBY_ARCH
-    RUBY_HDR_DIR
-    RUBY_ARCHHDR_DIR
-    RUBY_POSSIBLE_LIB_DIR
-    RUBY_RUBY_LIB_DIR
-    RUBY_SITEARCH_DIR
-    RUBY_SITELIB_DIR
-    RUBY_HAS_VENDOR_RUBY
-    RUBY_VENDORARCH_DIR
-    RUBY_VENDORLIB_DIR
-    RUBY_VERSION_MAJOR
-    RUBY_VERSION_MINOR
-    RUBY_VERSION_PATCH
+    Ruby_ARCH_DIR
+    Ruby_ARCH
+    Ruby_HDR_DIR
+    Ruby_ARCHHDR_DIR
+    Ruby_POSSIBLE_LIB_DIR
+    Ruby_RUBY_LIB_DIR
+    Ruby_SITEARCH_DIR
+    Ruby_SITELIB_DIR
+    Ruby_HAS_VENDOR_RUBY
+    Ruby_VENDORARCH_DIR
+    Ruby_VENDORLIB_DIR
+    Ruby_VERSION_MAJOR
+    Ruby_VERSION_MINOR
+    Ruby_VERSION_PATCH
     )
 endif()
 
-# In case RUBY_EXECUTABLE could not be executed (e.g. cross compiling)
+# In case Ruby_EXECUTABLE could not be executed (e.g. cross compiling)
 # try to detect which version we found. This is not too good.
-if(RUBY_EXECUTABLE AND NOT RUBY_VERSION_MAJOR)
+if(Ruby_EXECUTABLE AND NOT Ruby_VERSION_MAJOR)
   # by default assume 1.8.0
-  set(RUBY_VERSION_MAJOR 1)
-  set(RUBY_VERSION_MINOR 8)
-  set(RUBY_VERSION_PATCH 0)
+  set(Ruby_VERSION_MAJOR 1)
+  set(Ruby_VERSION_MINOR 8)
+  set(Ruby_VERSION_PATCH 0)
   # check whether we found 1.9.x
-  if(${RUBY_EXECUTABLE} MATCHES "ruby1\\.?9")
-    set(RUBY_VERSION_MAJOR 1)
-    set(RUBY_VERSION_MINOR 9)
+  if(${Ruby_EXECUTABLE} MATCHES "ruby1\\.?9")
+    set(Ruby_VERSION_MAJOR 1)
+    set(Ruby_VERSION_MINOR 9)
   endif()
   # check whether we found 2.0.x
-  if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?0")
-    set(RUBY_VERSION_MAJOR 2)
-    set(RUBY_VERSION_MINOR 0)
+  if(${Ruby_EXECUTABLE} MATCHES "ruby2\\.?0")
+    set(Ruby_VERSION_MAJOR 2)
+    set(Ruby_VERSION_MINOR 0)
   endif()
   # check whether we found 2.1.x
-  if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?1")
-    set(RUBY_VERSION_MAJOR 2)
-    set(RUBY_VERSION_MINOR 1)
+  if(${Ruby_EXECUTABLE} MATCHES "ruby2\\.?1")
+    set(Ruby_VERSION_MAJOR 2)
+    set(Ruby_VERSION_MINOR 1)
   endif()
   # check whether we found 2.2.x
-  if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?2")
-    set(RUBY_VERSION_MAJOR 2)
-    set(RUBY_VERSION_MINOR 2)
+  if(${Ruby_EXECUTABLE} MATCHES "ruby2\\.?2")
+    set(Ruby_VERSION_MAJOR 2)
+    set(Ruby_VERSION_MINOR 2)
   endif()
   # check whether we found 2.3.x
-  if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?3")
-    set(RUBY_VERSION_MAJOR 2)
-    set(RUBY_VERSION_MINOR 3)
+  if(${Ruby_EXECUTABLE} MATCHES "ruby2\\.?3")
+    set(Ruby_VERSION_MAJOR 2)
+    set(Ruby_VERSION_MINOR 3)
   endif()
   # check whether we found 2.4.x
-  if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?4")
-    set(RUBY_VERSION_MAJOR 2)
-    set(RUBY_VERSION_MINOR 4)
+  if(${Ruby_EXECUTABLE} MATCHES "ruby2\\.?4")
+    set(Ruby_VERSION_MAJOR 2)
+    set(Ruby_VERSION_MINOR 4)
   endif()
 endif()
 
-if(RUBY_VERSION_MAJOR)
-  set(RUBY_VERSION "${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}.${RUBY_VERSION_PATCH}")
-  set(_RUBY_VERSION_SHORT "${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}")
-  set(_RUBY_VERSION_SHORT_NODOT "${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}")
-  set(_RUBY_NODOT_VERSION "${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}${RUBY_VERSION_PATCH}")
+if(Ruby_VERSION_MAJOR)
+  set(Ruby_VERSION "${Ruby_VERSION_MAJOR}.${Ruby_VERSION_MINOR}.${Ruby_VERSION_PATCH}")
+  set(_Ruby_VERSION_SHORT "${Ruby_VERSION_MAJOR}.${Ruby_VERSION_MINOR}")
+  set(_Ruby_VERSION_SHORT_NODOT "${Ruby_VERSION_MAJOR}${Ruby_VERSION_MINOR}")
+  set(_Ruby_NODOT_VERSION "${Ruby_VERSION_MAJOR}${Ruby_VERSION_MINOR}${Ruby_VERSION_PATCH}")
 endif()
 
-find_path(RUBY_INCLUDE_DIR
+find_path(Ruby_INCLUDE_DIR
   NAMES ruby.h
   HINTS
-    ${RUBY_HDR_DIR}
-    ${RUBY_ARCH_DIR}
-    /usr/lib/ruby/${_RUBY_VERSION_SHORT}/i586-linux-gnu/
+    ${Ruby_HDR_DIR}
+    ${Ruby_ARCH_DIR}
+    /usr/lib/ruby/${_Ruby_VERSION_SHORT}/i586-linux-gnu/
 )
 
-set(RUBY_INCLUDE_DIRS ${RUBY_INCLUDE_DIR} )
+set(Ruby_INCLUDE_DIRS ${Ruby_INCLUDE_DIR} )
 
 # if ruby > 1.8 is required or if ruby > 1.8 was found, search for the config.h dir
-if( "${Ruby_FIND_VERSION_SHORT_NODOT}" GREATER 18  OR  "${_RUBY_VERSION_SHORT_NODOT}" GREATER 18  OR  RUBY_HDR_DIR)
-  find_path(RUBY_CONFIG_INCLUDE_DIR
+if( "${Ruby_FIND_VERSION_SHORT_NODOT}" GREATER 18  OR  "${_Ruby_VERSION_SHORT_NODOT}" GREATER 18  OR  Ruby_HDR_DIR)
+  find_path(Ruby_CONFIG_INCLUDE_DIR
     NAMES ruby/config.h  config.h
     HINTS
-      ${RUBY_HDR_DIR}/${RUBY_ARCH}
-      ${RUBY_ARCH_DIR}
-      ${RUBY_ARCHHDR_DIR}
+      ${Ruby_HDR_DIR}/${Ruby_ARCH}
+      ${Ruby_ARCH_DIR}
+      ${Ruby_ARCHHDR_DIR}
   )
 
-  set(RUBY_INCLUDE_DIRS ${RUBY_INCLUDE_DIRS} ${RUBY_CONFIG_INCLUDE_DIR} )
+  set(Ruby_INCLUDE_DIRS ${Ruby_INCLUDE_DIRS} ${Ruby_CONFIG_INCLUDE_DIR} )
 endif()
 
 
 # Determine the list of possible names for the ruby library
-set(_RUBY_POSSIBLE_LIB_NAMES ruby ruby-static ruby${_RUBY_VERSION_SHORT} ruby${_RUBY_VERSION_SHORT_NODOT} ruby-${_RUBY_VERSION_SHORT} ruby-${RUBY_VERSION})
+set(_Ruby_POSSIBLE_LIB_NAMES ruby ruby-static ruby${_Ruby_VERSION_SHORT} ruby${_Ruby_VERSION_SHORT_NODOT} ruby-${_Ruby_VERSION_SHORT} ruby-${Ruby_VERSION})
 
 if(WIN32)
-  set( _RUBY_MSVC_RUNTIME "" )
+  set( _Ruby_MSVC_RUNTIME "" )
   if( MSVC_VERSION EQUAL 1200 )
-    set( _RUBY_MSVC_RUNTIME "60" )
+    set( _Ruby_MSVC_RUNTIME "60" )
   endif()
   if( MSVC_VERSION EQUAL 1300 )
-    set( _RUBY_MSVC_RUNTIME "70" )
+    set( _Ruby_MSVC_RUNTIME "70" )
   endif()
   if( MSVC_VERSION EQUAL 1310 )
-    set( _RUBY_MSVC_RUNTIME "71" )
+    set( _Ruby_MSVC_RUNTIME "71" )
   endif()
   if( MSVC_VERSION EQUAL 1400 )
-    set( _RUBY_MSVC_RUNTIME "80" )
+    set( _Ruby_MSVC_RUNTIME "80" )
   endif()
   if( MSVC_VERSION EQUAL 1500 )
-    set( _RUBY_MSVC_RUNTIME "90" )
+    set( _Ruby_MSVC_RUNTIME "90" )
   endif()
 
-  set(_RUBY_ARCH_PREFIX "")
+  set(_Ruby_ARCH_PREFIX "")
   if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-    set(_RUBY_ARCH_PREFIX "x64-")
+    set(_Ruby_ARCH_PREFIX "x64-")
   endif()
 
-  list(APPEND _RUBY_POSSIBLE_LIB_NAMES
-             "${_RUBY_ARCH_PREFIX}msvcr${_RUBY_MSVC_RUNTIME}-ruby${_RUBY_NODOT_VERSION}"
-             "${_RUBY_ARCH_PREFIX}msvcr${_RUBY_MSVC_RUNTIME}-ruby${_RUBY_NODOT_VERSION}-static"
-             "${_RUBY_ARCH_PREFIX}msvcrt-ruby${_RUBY_NODOT_VERSION}"
-             "${_RUBY_ARCH_PREFIX}msvcrt-ruby${_RUBY_NODOT_VERSION}-static" )
+  list(APPEND _Ruby_POSSIBLE_LIB_NAMES
+             "${_Ruby_ARCH_PREFIX}msvcr${_Ruby_MSVC_RUNTIME}-ruby${_Ruby_NODOT_VERSION}"
+             "${_Ruby_ARCH_PREFIX}msvcr${_Ruby_MSVC_RUNTIME}-ruby${_Ruby_NODOT_VERSION}-static"
+             "${_Ruby_ARCH_PREFIX}msvcrt-ruby${_Ruby_NODOT_VERSION}"
+             "${_Ruby_ARCH_PREFIX}msvcrt-ruby${_Ruby_NODOT_VERSION}-static" )
 endif()
 
-find_library(RUBY_LIBRARY NAMES ${_RUBY_POSSIBLE_LIB_NAMES} HINTS ${RUBY_POSSIBLE_LIB_DIR} )
+find_library(Ruby_LIBARY NAMES ${_Ruby_POSSIBLE_LIB_NAMES} HINTS ${Ruby_POSSIBLE_LIB_DIR} )
 
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
-set(_RUBY_REQUIRED_VARS RUBY_EXECUTABLE RUBY_INCLUDE_DIR RUBY_LIBRARY)
-if(_RUBY_VERSION_SHORT_NODOT GREATER 18)
-  list(APPEND _RUBY_REQUIRED_VARS RUBY_CONFIG_INCLUDE_DIR)
+set(_Ruby_REQUIRED_VARS Ruby_EXECUTABLE Ruby_INCLUDE_DIR Ruby_LIBARY)
+if(_Ruby_VERSION_SHORT_NODOT GREATER 18)
+  list(APPEND _Ruby_REQUIRED_VARS Ruby_CONFIG_INCLUDE_DIR)
 endif()
 
-if(_RUBY_DEBUG_OUTPUT)
+if(_Ruby_DEBUG_OUTPUT)
   message(STATUS "--------FindRuby.cmake debug------------")
-  message(STATUS "_RUBY_POSSIBLE_EXECUTABLE_NAMES: ${_RUBY_POSSIBLE_EXECUTABLE_NAMES}")
-  message(STATUS "_RUBY_POSSIBLE_LIB_NAMES: ${_RUBY_POSSIBLE_LIB_NAMES}")
-  message(STATUS "RUBY_ARCH_DIR: ${RUBY_ARCH_DIR}")
-  message(STATUS "RUBY_HDR_DIR: ${RUBY_HDR_DIR}")
-  message(STATUS "RUBY_POSSIBLE_LIB_DIR: ${RUBY_POSSIBLE_LIB_DIR}")
-  message(STATUS "Found RUBY_VERSION: \"${RUBY_VERSION}\" , short: \"${_RUBY_VERSION_SHORT}\", nodot: \"${_RUBY_VERSION_SHORT_NODOT}\"")
-  message(STATUS "_RUBY_REQUIRED_VARS: ${_RUBY_REQUIRED_VARS}")
-  message(STATUS "RUBY_EXECUTABLE: ${RUBY_EXECUTABLE}")
-  message(STATUS "RUBY_LIBRARY: ${RUBY_LIBRARY}")
-  message(STATUS "RUBY_INCLUDE_DIR: ${RUBY_INCLUDE_DIR}")
-  message(STATUS "RUBY_CONFIG_INCLUDE_DIR: ${RUBY_CONFIG_INCLUDE_DIR}")
+  message(STATUS "_Ruby_POSSIBLE_EXECUTABLE_NAMES: ${_Ruby_POSSIBLE_EXECUTABLE_NAMES}")
+  message(STATUS "_Ruby_POSSIBLE_LIB_NAMES: ${_Ruby_POSSIBLE_LIB_NAMES}")
+  message(STATUS "Ruby_ARCH_DIR: ${Ruby_ARCH_DIR}")
+  message(STATUS "Ruby_HDR_DIR: ${Ruby_HDR_DIR}")
+  message(STATUS "Ruby_POSSIBLE_LIB_DIR: ${Ruby_POSSIBLE_LIB_DIR}")
+  message(STATUS "Found Ruby_VERSION: \"${Ruby_VERSION}\" , short: \"${_Ruby_VERSION_SHORT}\", nodot: \"${_Ruby_VERSION_SHORT_NODOT}\"")
+  message(STATUS "_Ruby_REQUIRED_VARS: ${_Ruby_REQUIRED_VARS}")
+  message(STATUS "Ruby_EXECUTABLE: ${Ruby_EXECUTABLE}")
+  message(STATUS "Ruby_LIBARY: ${Ruby_LIBARY}")
+  message(STATUS "Ruby_INCLUDE_DIR: ${Ruby_INCLUDE_DIR}")
+  message(STATUS "Ruby_CONFIG_INCLUDE_DIR: ${Ruby_CONFIG_INCLUDE_DIR}")
   message(STATUS "--------------------")
 endif()
 
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(Ruby  REQUIRED_VARS  ${_RUBY_REQUIRED_VARS}
-                                        VERSION_VAR RUBY_VERSION )
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Ruby  REQUIRED_VARS  ${_Ruby_REQUIRED_VARS}
+                                        VERSION_VAR Ruby_VERSION )
 
 mark_as_advanced(
-  RUBY_EXECUTABLE
-  RUBY_LIBRARY
-  RUBY_INCLUDE_DIR
-  RUBY_CONFIG_INCLUDE_DIR
+  Ruby_EXECUTABLE
+  Ruby_LIBARY
+  Ruby_INCLUDE_DIR
+  Ruby_CONFIG_INCLUDE_DIR
   )
 
-# Set some variables for compatibility with previous version of this file
-set(RUBY_POSSIBLE_LIB_PATH ${RUBY_POSSIBLE_LIB_DIR})
-set(RUBY_RUBY_LIB_PATH ${RUBY_RUBY_LIB_DIR})
-set(RUBY_INCLUDE_PATH ${RUBY_INCLUDE_DIRS})
+# Set some variables for compatibility with previous version of this file (no need to provide a CamelCase version of that...)
+set(RUBY_POSSIBLE_LIB_PATH ${Ruby_POSSIBLE_LIB_DIR})
+set(RUBY_RUBY_LIB_PATH ${Ruby_RUBY_LIB_DIR})
+set(RUBY_INCLUDE_PATH ${Ruby_INCLUDE_DIRS})
+
+# Backwards compatibility
+# Define upper case versions of output variables
+foreach(Camel
+    Ruby_EXECUTABLE
+    Ruby_INCLUDE_DIRS
+    Ruby_LIBRARY
+    Ruby_VERSION
+    Ruby_VERSION_MAJOR
+    Ruby_VERSION_MINOR
+    Ruby_VERSION_PATCH
+    Ruby_INCLUDE_PATH
+
+    Ruby_ARCH_DIR
+    Ruby_ARCH
+    Ruby_HDR_DIR
+    Ruby_ARCHHDR_DIR
+    Ruby_POSSIBLE_LIB_DIR
+    Ruby_RUBY_LIB_DIR
+    Ruby_SITEARCH_DIR
+    Ruby_SITELIB_DIR
+    Ruby_HAS_VENDOR_RUBY
+    Ruby_VENDORARCH_DIR
+
+    )
+    string(TOUPPER ${Camel} UPPER)
+    set(${UPPER} ${${Camel}})
+endforeach()