From 3b1b261cd8b891ccd254384c8c82e7d93a9d632c Mon Sep 17 00:00:00 2001
From: Dominic Hofer <6570912+dominichofer@users.noreply.github.com>
Date: Wed, 6 Sep 2023 20:54:42 +0200
Subject: Handles case of empty craype_dir (#39371)

The craype_dir folder can be empty. It happens to be the case on Arolla and Tsa at CSCS.
---
 lib/spack/spack/platforms/cray.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/spack/spack/platforms/cray.py b/lib/spack/spack/platforms/cray.py
index 7028b0db34..af40510b2c 100644
--- a/lib/spack/spack/platforms/cray.py
+++ b/lib/spack/spack/platforms/cray.py
@@ -139,6 +139,8 @@ class Cray(Platform):
         # If no default version, sort available versions and return latest
         versions_available = [spack.version.Version(v) for v in os.listdir(craype_dir)]
         versions_available.sort(reverse=True)
+        if not versions_available:
+            return (craype_type, None)
         return (craype_type, versions_available[0])
 
     @classmethod
-- 
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