From 0b12a480eb7ccced87a153c1e89dfa7f3e307d84 Mon Sep 17 00:00:00 2001
From: "John W. Parent" <45471568+johnwparent@users.noreply.github.com>
Date: Thu, 25 May 2023 21:38:04 -0400
Subject: Windows MSVC: do not set sdk version if installing sdk (#37930)

Note the win-sdk package is not installable and reports an error
which instructs the user how to add it. Without this fix, a
(more confusing) error occurs before this message can be generated.
---
 lib/spack/spack/compilers/msvc.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/spack/spack/compilers/msvc.py b/lib/spack/spack/compilers/msvc.py
index 54d159d6a7..6e9d1d0277 100644
--- a/lib/spack/spack/compilers/msvc.py
+++ b/lib/spack/spack/compilers/msvc.py
@@ -151,7 +151,11 @@ class Msvc(Compiler):
         arch = arch.replace("-", "_")
         # vcvars can target specific sdk versions, force it to pick up concretized sdk
         # version, if needed by spec
-        sdk_ver = "" if "win-sdk" not in pkg.spec else pkg.spec["win-sdk"].version.string + ".0"
+        sdk_ver = (
+            ""
+            if "win-sdk" not in pkg.spec or pkg.name == "win-sdk"
+            else pkg.spec["win-sdk"].version.string + ".0"
+        )
         # provide vcvars with msvc version selected by concretization,
         # not whatever it happens to pick up on the system (highest available version)
         out = subprocess.check_output(  # novermin
-- 
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