From 7c01ba8fea16602a0c74a97298a4d4c67c5727be Mon Sep 17 00:00:00 2001
From: Massimiliano Culpo <massimiliano.culpo@gmail.com>
Date: Tue, 1 Dec 2020 18:09:14 +0100
Subject: spec: return early from concretization if a spec is already concrete
 (#20196)

---
 lib/spack/spack/spec.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index ac4ce87331..46400859d3 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -2442,6 +2442,9 @@ class Spec(object):
             raise spack.error.SpecError(
                 "Spec has no name; cannot concretize an anonymous spec")
 
+        if self._concrete:
+            return
+
         result = spack.solver.asp.solve([self], tests=tests)
         if not result.satisfiable:
             result.print_cores()
-- 
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