From 474493713b15a9cd76fafa778a857f3ea22b0060 Mon Sep 17 00:00:00 2001
From: Harmen Stoppels <harmenstoppels@gmail.com>
Date: Mon, 14 Mar 2022 12:27:49 +0100
Subject: [PATCH] compiler.py: early return in compiler_environment when no
 modules (#29441)

---
 lib/spack/spack/compiler.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/spack/spack/compiler.py b/lib/spack/spack/compiler.py
index b8ebc622f22..976699702b4 100644
--- a/lib/spack/spack/compiler.py
+++ b/lib/spack/spack/compiler.py
@@ -598,6 +598,11 @@ def __str__(self):
 
     @contextlib.contextmanager
     def compiler_environment(self):
+        # yield immediately if no modules
+        if not self.modules:
+            yield
+            return
+
         # store environment to replace later
         backup_env = os.environ.copy()