From aeb561d234fd720bd094216e11f7784c1579d0fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20M=C3=BCtzel?= <markus.muetzel@gmx.de>
Date: Fri, 25 Mar 2022 13:37:15 +0100
Subject: [PATCH] Add support for Intel Fortran compilers.

Port changes from upstream Reference-LAPACK.
---
 cmake/fc.cmake | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/cmake/fc.cmake b/cmake/fc.cmake
index 9feda9be3..94199605d 100644
--- a/cmake/fc.cmake
+++ b/cmake/fc.cmake
@@ -67,7 +67,15 @@ if (${F_COMPILER} STREQUAL "GFORTRAN")
     if (BINARY64)
       set(FCOMMON_OPT "${FCOMMON_OPT} -m64")
       if (INTERFACE64)
-        set(FCOMMON_OPT "${FCOMMON_OPT} -fdefault-integer-8")
+        if (CMAKE_Fortran_COMPILER_ID STREQUAL "Intel")
+          if (WIN32)
+            set(FCOMMON_OPT "${FCOMMON_OPT} /integer-size:64")
+          else ()
+            set(FCOMMON_OPT "${FCOMMON_OPT} -integer-size 64")
+          endif ()
+        else ()
+          set(FCOMMON_OPT "${FCOMMON_OPT} -fdefault-integer-8")
+        endif ()
       endif ()
     else ()
       set(FCOMMON_OPT "${FCOMMON_OPT} -m32")