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-rw-r--r--lib/spack/spack/spec.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 89a023a750..470353c4f6 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -1071,6 +1071,11 @@ class Spec(object):
# If there is a provider for the vpkg, then use that instead of
# the virtual package.
if providers:
+ # Remove duplicate providers that can concretize to the same result.
+ for provider in providers:
+ for spec in providers:
+ if spec is not provider and provider.satisfies(spec):
+ providers.remove(spec)
# Can't have multiple providers for the same thing in one spec.
if len(providers) > 1:
raise MultipleProviderError(vdep, providers)