From d84d6ed409c663573a02efa7d2692b6829d27c46 Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Sat, 17 Jan 2015 14:10:26 +0100
Subject: WCDH: Allow compilers to specify features for one language but not
 the other.

---
 Modules/WriteCompilerDetectionHeader.cmake | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Modules/WriteCompilerDetectionHeader.cmake b/Modules/WriteCompilerDetectionHeader.cmake
index 0464e66..d9ab9fb 100644
--- a/Modules/WriteCompilerDetectionHeader.cmake
+++ b/Modules/WriteCompilerDetectionHeader.cmake
@@ -386,6 +386,13 @@ function(write_compiler_detection_header
   endif()
 
   foreach(_lang ${_langs})
+    set(target_compilers)
+    foreach(compiler ${_WCD_COMPILERS})
+      _load_compiler_variables(${compiler} ${_lang} ${${_lang}_features})
+      if(_cmake_oldestSupported_${compiler})
+        list(APPEND target_compilers ${compiler})
+      endif()
+    endforeach()
 
     get_property(known_features GLOBAL PROPERTY CMAKE_${_lang}_KNOWN_FEATURES)
     foreach(feature ${${_lang}_features})
@@ -408,8 +415,7 @@ function(write_compiler_detection_header
     set(file_content "${file_content}${ID_CONTENT}\n")
 
     set(pp_if "if")
-    foreach(compiler ${_WCD_COMPILERS})
-      _load_compiler_variables(${compiler} ${_lang} ${${_lang}_features})
+    foreach(compiler ${target_compilers})
       set(file_content "${file_content}\n#  ${pp_if} ${prefix_arg}_COMPILER_IS_${compiler}\n")
 
       if(_WCD_OUTPUT_FILES_VAR)
-- 
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