From 25f1aad1c8ccee7468b9841b3ccf87189fcece90 Mon Sep 17 00:00:00 2001
From: Kyle Gerheiser <3209794+kgerheiser@users.noreply.github.com>
Date: Wed, 3 Nov 2021 13:18:17 -0400
Subject: nemsio package: add version 2.5.4; add option to build without MPI
 (#27030)

Version 2.5.4 adds an option which allows Nemsio to be built without MPI
---
 var/spack/repos/builtin/packages/nemsio/package.py | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/var/spack/repos/builtin/packages/nemsio/package.py b/var/spack/repos/builtin/packages/nemsio/package.py
index ca86f37233..2b9a523718 100644
--- a/var/spack/repos/builtin/packages/nemsio/package.py
+++ b/var/spack/repos/builtin/packages/nemsio/package.py
@@ -18,11 +18,16 @@ class Nemsio(CMakePackage):
 
     maintainers = ['t-brown', 'edwardhartnett', 'kgerheiser', 'Hang-Lei-NOAA']
 
+    variant('mpi', default=True, description='Build Nemsio with MPI')
+    # Nemsio 2.5.3 and below require MPI
+    conflicts('~mpi', when='@:2.5.3')
+
+    version('2.5.4', sha256='186a5f37d509d280c0237d4917db86ad676c5dd12d8a892df0333a10e751e481')
     version('2.5.3', sha256='3fe8a781fc96197803d369cafe0138f3a5cbbca9816a7f8fd57567a1719a4d49')
     version('2.5.2', sha256='c59e9379969690de8d030cbf4bbbbe3726faf13c304f3b88b0f6aec1496d2c08')
 
     depends_on('bacio')
-    depends_on('mpi')
+    depends_on('mpi', when='+mpi')
 
     # nemsio 2.5.2 and earlier depend on w3nco.
     depends_on('w3nco', when='@:2.5.2')
@@ -31,4 +36,11 @@ class Nemsio(CMakePackage):
     depends_on('w3emc@2.9.0:', when='@2.5.3:')
 
     def cmake_args(self):
-        return ['-DMPI_Fortran_COMPILER=%s' % self.spec['mpi'].mpifc]
+        args = [
+            self.define_from_variant('ENABLE_MPI', 'mpi')
+        ]
+
+        if self.spec.satisfies('+mpi'):
+            args.append(self.define('CMAKE_Fortran_COMPILER', self.spec['mpi'].mpifc))
+
+        return args
-- 
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