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-rw-r--r--lib/spack/spack/concretize.py11
-rw-r--r--var/spack/packages/python/package.py2
2 files changed, 10 insertions, 3 deletions
diff --git a/lib/spack/spack/concretize.py b/lib/spack/spack/concretize.py
index d9419da784..85cdb202d5 100644
--- a/lib/spack/spack/concretize.py
+++ b/lib/spack/spack/concretize.py
@@ -40,7 +40,6 @@ import spack.error
from spack.version import *
-
class DefaultConcretizer(object):
"""This class doesn't have any state, it just provides some methods for
concretization. You can subclass it to override just some of the
@@ -68,9 +67,17 @@ class DefaultConcretizer(object):
# If there are known available versions, return the most recent
# version that satisfies the spec
pkg = spec.package
+
+ # Key function to sort versions first by whether they were
+ # marked `preferred=True`, then by most recent.
+ def preferred_key(v):
+ prefer = pkg.versions[v].get('preferred', False)
+ return (prefer, v)
+
valid_versions = sorted(
[v for v in pkg.versions
- if any(v.satisfies(sv) for sv in spec.versions)])
+ if any(v.satisfies(sv) for sv in spec.versions)],
+ key=preferred_key)
if valid_versions:
spec.versions = ver([valid_versions[-1]])
diff --git a/var/spack/packages/python/package.py b/var/spack/packages/python/package.py
index 30e6ef6bb8..0da7f4ce89 100644
--- a/var/spack/packages/python/package.py
+++ b/var/spack/packages/python/package.py
@@ -17,7 +17,7 @@ class Python(Package):
version('2.7.8', 'd235bdfa75b8396942e360a70487ee00')
version('2.7.10', 'c685ef0b8e9f27b5e3db5db12b268ac6')
- version('2.7.11', '1dbcc848b4cd8399a8199d000f9f823c')
+ version('2.7.11', '1dbcc848b4cd8399a8199d000f9f823c', preferred=True)
version('3.5.0', 'd149d2812f10cbe04c042232e7964171')
version('3.5.1', 'e9ea6f2623fffcdd871b7b19113fde80')