From f64f9940afc02b3d11f5326d806f8c24483df6cd Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 20 Aug 2009 16:21:53 -0400
Subject: Teach FortranCInterface to verify languages

This module requires both C and Fortran to be enabled, so error-out if
they are not.
---
 Modules/FortranCInterface.cmake | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Modules/FortranCInterface.cmake b/Modules/FortranCInterface.cmake
index 580f84e..eba97c6 100644
--- a/Modules/FortranCInterface.cmake
+++ b/Modules/FortranCInterface.cmake
@@ -76,6 +76,15 @@ if(FortranCInterface_SOURCE_DIR)
 endif()
 
 #-----------------------------------------------------------------------------
+# Verify that C and Fortran are available.
+foreach(lang C Fortran)
+  if(NOT CMAKE_${lang}_COMPILER_LOADED)
+    message(FATAL_ERROR
+      "FortranCInterface requires the ${lang} language to be enabled.")
+  endif()
+endforeach()
+
+#-----------------------------------------------------------------------------
 # Set up an interface detection project.
 set(FortranCInterface_SOURCE_DIR ${CMAKE_ROOT}/Modules/FortranCInterface)
 set(FortranCInterface_BINARY_DIR ${CMAKE_BINARY_DIR}/CMakeFiles/FortranCInterface)
-- 
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