From cb3a0a5249c1c87bb186a6e170407b1f601a314c Mon Sep 17 00:00:00 2001
From: Radovan Bast <bast@users.noreply.github.com>
Date: Sun, 19 Jul 2015 15:37:53 +0200
Subject: [PATCH] make it possible to toggle fortran support

---
 modules/fc.cmake | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/modules/fc.cmake b/modules/fc.cmake
index c4b005f..ac6c190 100644
--- a/modules/fc.cmake
+++ b/modules/fc.cmake
@@ -8,6 +8,7 @@
 # Variables used::
 #
 #   EXTRA_FCFLAGS
+#   ENABLE_FC_SUPPORT
 #
 # Variables defined::
 #
@@ -17,6 +18,10 @@
 #
 #   CMAKE_Fortran_FLAGS
 #
+# Variables set::
+#
+#   ENABLE_FC_SUPPORT
+#
 # Environment variables used::
 #
 #   FCFLAGS
@@ -27,26 +32,32 @@
 #   source: https://github.com/scisoft/autocmake/raw/master/modules/fc.cmake
 #   docopt: --fc=<FC> Fortran compiler [default: gfortran].
 #           --extra-fc-flags=<EXTRA_FCFLAGS> Extra Fortran compiler flags [default: ''].
+#           --fc-support=<FC_SUPPORT> Toggle Fortran language support (ON/OFF) [default: ON].
 #   export: 'FC=%s' % arguments['--fc']
 #   define: '-DEXTRA_FCFLAGS="%s"' % arguments['--extra-fc-flags']
+#           '-DENABLE_FC_SUPPORT="%s"' % arguments['--fc-support']
 
-enable_language(Fortran)
+option(ENABLE_FC_SUPPORT "Enable Fortran language support" ON)
 
-set(CMAKE_Fortran_MODULE_DIRECTORY ${PROJECT_BINARY_DIR}/include/fortran)
+if(ENABLE_FC_SUPPORT)
+    enable_language(Fortran)
 
-if(NOT DEFINED CMAKE_Fortran_COMPILER_ID)
-    message(FATAL_ERROR "CMAKE_Fortran_COMPILER_ID variable is not defined!")
-endif()
-
-if(NOT CMAKE_Fortran_COMPILER_WORKS)
-    message(FATAL_ERROR "CMAKE_Fortran_COMPILER_WORKS is false!")
-endif()
-
-if(DEFINED EXTRA_FCFLAGS)
-    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${EXTRA_FCFLAGS}")
-endif()
-
-if(DEFINED ENV{FCFLAGS})
-    message(STATUS "FCFLAGS is set to '$ENV{FCFLAGS}'.")
-    set(CMAKE_Fortran_FLAGS "$ENV{FCFLAGS}")
+    set(CMAKE_Fortran_MODULE_DIRECTORY ${PROJECT_BINARY_DIR}/include/fortran)
+
+    if(NOT DEFINED CMAKE_Fortran_COMPILER_ID)
+        message(FATAL_ERROR "CMAKE_Fortran_COMPILER_ID variable is not defined!")
+    endif()
+
+    if(NOT CMAKE_Fortran_COMPILER_WORKS)
+        message(FATAL_ERROR "CMAKE_Fortran_COMPILER_WORKS is false!")
+    endif()
+
+    if(DEFINED EXTRA_FCFLAGS)
+        set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${EXTRA_FCFLAGS}")
+    endif()
+
+    if(DEFINED ENV{FCFLAGS})
+        message(STATUS "FCFLAGS is set to '$ENV{FCFLAGS}'.")
+        set(CMAKE_Fortran_FLAGS "$ENV{FCFLAGS}")
+    endif()
 endif()