From 3f9cccb2d6ad2f63bfde3faa64aa641d0dbd6432 Mon Sep 17 00:00:00 2001
From: Augustin Degomme <adegomme@gmail.com>
Date: Fri, 28 Feb 2020 15:24:39 +0100
Subject: [PATCH] Only test fortran for LTO if compiler is present. We activate
 the language in Cmake to test if the compiler is there whenever
 enable_fortran is given. But this means that LTO will be tested for fortran
 as well if we don't say otherwise, even if the compiler was not found (which
 we allow).

---
 tools/cmake/Flags.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/cmake/Flags.cmake b/tools/cmake/Flags.cmake
index 1c4b9a6e4a..2fc6cc8edc 100644
--- a/tools/cmake/Flags.cmake
+++ b/tools/cmake/Flags.cmake
@@ -119,7 +119,11 @@ if(enable_lto) # User wants LTO. Try if we can do that
       endif()
     else()
       include(CheckIPOSupported)
-      check_ipo_supported(RESULT ipo)
+      set(ipoLANGS C CXX)
+      if(SMPI_FORTRAN)
+        set(ipoLANGS ${ipoLANGS} Fortran)
+      endif()
+      check_ipo_supported(RESULT ipo LANGUAGES ${ipoLANGS})
       if(ipo)
         set(enable_lto ON)
       endif()
-- 
2.20.1