From 2d36c9ab60f9d1fa5304ebf23b09fa79ff8b667e Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 11 Oct 2013 10:40:18 -0400
Subject: [PATCH] CMakeDetermineCompilerId: Fix Intel Fortran compiler id
 detection

The Intel Fortran compiler needs the /fpp option to enable C
preprocessing.  Without the option the compiler may warn and ignore
preprocessor lines instead of failing with an error.  Detect the
warning and treat it as failure so that we move on to try /fpp and
detect the correct id.  Without this it works only by luck because
Intel is the first compiler id in our detection source file.
---
 Modules/CMakeDetermineCompilerId.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index 71f15dfd7..4c2b506b0 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -248,7 +248,10 @@ Id flags: ${testflags}
   endif()
 
   # Check the result of compilation.
-  if(CMAKE_${lang}_COMPILER_ID_RESULT)
+  if(CMAKE_${lang}_COMPILER_ID_RESULT
+     # Intel Fortran warns and ignores preprocessor lines without /fpp
+     OR CMAKE_${lang}_COMPILER_ID_OUTPUT MATCHES "Bad # preprocessor line"
+     )
     # Compilation failed.
     set(MSG
       "Compiling the ${lang} compiler identification source file \"${src}\" failed.