From 716ae59fb79d85eccccddc948ee49dcc14f1b897 Mon Sep 17 00:00:00 2001
From: degomme <augustin.degomme@unibas.ch>
Date: Wed, 19 Oct 2016 11:50:48 +0200
Subject: [PATCH] cleanup handling of Fortran compiler in cmake (Patch from M.
 Volat)

---
 CMakeLists.txt      | 36 ++++++++++++------------------------
 src/smpi/smpif90.in |  2 +-
 src/smpi/smpiff.in  |  2 +-
 3 files changed, 14 insertions(+), 26 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 76a32dabdd..892895526b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -66,34 +66,22 @@ include(${CMAKE_HOME_DIRECTORY}/tools/cmake/Option.cmake)
 
 ### SMPI vs. Fortran
 if ((NOT DEFINED enable_smpi) OR enable_smpi) 
+  # First unset the compiler in case we're re-running cmake over a previous
+  # configuration where it was saved as smpiff
+  unset(CMAKE_Fortran_COMPILER)
+  
   if(enable_fortran)
-    include(FindGFortran)
+    enable_language(Fortran OPTIONAL)
   else()
     SET(SMPI_FORTRAN 0)
   endif()
   
-  if(NOT APPLE) # smpi is enabled by default
-    # Call enable_language(Fortran) in order to load the build rules for this language, needed by 
-    # teshsuite/smpi/mpich-test/.  Use CMAKE_FORCE_Fortran_COMPILER to bypass checks for a working compiler (smpiff 
-    # doesn't exist at configure time).
-    include(CMakeForceCompiler)
-    if(NOT COMMAND CMAKE_FORCE_Fortran_COMPILER)
-      MACRO(CMAKE_FORCE_Fortran_COMPILER compiler id)
-        SET(CMAKE_Fortran_COMPILER "${compiler}")
-        SET(CMAKE_Fortran_COMPILER_ID_RUN TRUE)
-        SET(CMAKE_Fortran_COMPILER_ID ${id})
-        SET(CMAKE_Fortran_COMPILER_WORKS TRUE)
-        SET(CMAKE_Fortran_COMPILER_FORCED TRUE)
-
-        # Set old compiler id variables.
-        IF("${CMAKE_Fortran_COMPILER_ID}" MATCHES "GNU")
-          SET(CMAKE_COMPILER_IS_GNUG77 1)
-        ENDIF("${CMAKE_Fortran_COMPILER_ID}" MATCHES "GNU")
-      ENDMACRO(CMAKE_FORCE_Fortran_COMPILER)
-    endif()
-    CMAKE_FORCE_Fortran_COMPILER(smpiff smpiff)
-    enable_language(Fortran OPTIONAL)
-  endif()
+  if(CMAKE_Fortran_COMPILER)
+    # Fortran compiler detected: save it, then replace by smpiff
+    set(SAVED_Fortran_COMPILER "${CMAKE_Fortran_COMPILER}" CACHE FILEPATH "The real Fortran compiler")
+    set(CMAKE_Fortran_COMPILER smpiff)
+    set(SMPI_FORTRAN 1)
+  endif(CMAKE_Fortran_COMPILER)
 endif()
 
 #-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#
@@ -947,7 +935,7 @@ else()
 endif()
 endif()
 if(CMAKE_Fortran_COMPILER)
-  message("        Compiler: Fortran ...........: ${CMAKE_Fortran_COMPILER} (id: ${CMAKE_Fortran_COMPILER_ID})")
+  message("        Compiler: Fortran ...........: ${SAVED_Fortran_COMPILER} (id: ${CMAKE_Fortran_COMPILER_ID})")
   message("                version .............: ${CMAKE_Fortran_COMPILER_VERSION}")
 endif()
 message("        Linker: .....................: ${CMAKE_LINKER}")
diff --git a/src/smpi/smpif90.in b/src/smpi/smpif90.in
index 231a4b795a..cccf2141bf 100644
--- a/src/smpi/smpif90.in
+++ b/src/smpi/smpif90.in
@@ -9,7 +9,7 @@
 SIMGRID_VERSION="@SIMGRID_VERSION_STRING@"
 SIMGRID_GITHASH="@SIMGRID_GITHASH@"
 
-F90=@GFORTRAN_EXE@
+F90=@SAVED_Fortran_COMPILER@
 
 INCLUDEARGS="@includeflag@"
 CMAKE_LINKARGS="-L@libdir@"
diff --git a/src/smpi/smpiff.in b/src/smpi/smpiff.in
index fe27e142a5..ca37fc494c 100644
--- a/src/smpi/smpiff.in
+++ b/src/smpi/smpiff.in
@@ -9,7 +9,7 @@
 SIMGRID_VERSION="@SIMGRID_VERSION_STRING@"
 SIMGRID_GITHASH="@SIMGRID_GITHASH@"
 
-F77=@GFORTRAN_EXE@
+F77=@SAVED_Fortran_COMPILER@
 
 INCLUDEARGS="@includeflag@"
 CMAKE_LINKARGS="-L@libdir@"
-- 
2.20.1