From a74ef3e63547ccc05af86ab5ec0f5bf0701653f6 Mon Sep 17 00:00:00 2001
From: Matthew Thompson <matthew.thompson@nasa.gov>
Date: Wed, 30 Aug 2023 12:38:39 -0400
Subject: [PATCH] Add support for generic x86_64 processor with Intel Fortran

---
 CHANGELOG.md                       | 2 ++
 compiler/flags/GNU_Fortran.cmake   | 1 +
 compiler/flags/Intel_Fortran.cmake | 3 +++
 3 files changed, 6 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index dfba046..d472c48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added support for building with Intel Fortran in Rosetta2 (generic x86_64 processor)
+
 ### Changed
 
 ## [3.31.1] - 2023-08-03
diff --git a/compiler/flags/GNU_Fortran.cmake b/compiler/flags/GNU_Fortran.cmake
index 9140d49..bd4b268 100644
--- a/compiler/flags/GNU_Fortran.cmake
+++ b/compiler/flags/GNU_Fortran.cmake
@@ -137,6 +137,7 @@ elseif (${proc_description} MATCHES "Intel")
   set (PREFER_AVX128 "-mprefer-avx128")
   set (NO_FMA "-mno-fma")
 elseif ( ${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "x86_64" )
+  message(WARNING "Unknown processor type. Defaulting to a generic x86_64 processor. Performance may be suboptimal.")
   set (GNU_TARGET_ARCH "x86-64")
   set (GNU_NATIVE_ARCH "native")
 else ()
diff --git a/compiler/flags/Intel_Fortran.cmake b/compiler/flags/Intel_Fortran.cmake
index 3c69813..26856c7 100644
--- a/compiler/flags/Intel_Fortran.cmake
+++ b/compiler/flags/Intel_Fortran.cmake
@@ -72,6 +72,9 @@ elseif (${proc_description} MATCHES "Intel")
   # Previous versions of GEOS used this flag, which was not portable
   # for AMD. Keeping here for a few versions for historical purposes.
   #set (COREAVX2_FLAG "-xCORE-AVX2")
+elseif ( ${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "x86_64" )
+  message(WARNING "Unknown processory type. Defaulting to a generic x86_64 processor. Performance may be suboptimal.")
+  set (COREAVX2_FLAG "")
 else ()
   message(FATAL_ERROR "Unknown processor. Please file an issue at https://github.com/GEOS-ESM/ESMA_cmake")
 endif ()