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"""
Functions here are used to take abstract specs and make them concrete.
For example, if a spec asks for a version between 1.8 and 1.9, these
functions might take will take the most recent 1.9 version of the
package available. Or, if the user didn't specify a compiler for a
spec, then this will assign a compiler to the spec based on defaults
or user preferences.
TODO: make this customizable and allow users to configure
concretization policies.
"""
import spack.architecture
import spack.compilers
import spack.packages
import spack.spec
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
default concretization strategies, or you can override all of them.
"""
def concretize_version(self, spec):
"""If the spec is already concrete, return. Otherwise take
the most recent available version, and default to the package's
version if there are no avaialble versions.
"""
# return if already concrete.
if spec.versions.concrete:
return
# If there are known avaialble versions, return the most recent
# version that satisfies the spec
pkg = spec.package
valid_versions = pkg.available_versions.intersection(spec.versions)
if valid_versions:
spec.versions = ver([valid_versions[-1]])
else:
spec.versions = ver([pkg.default_version])
def concretize_architecture(self, spec):
"""If the spec already had an architecture, return. Otherwise if
the root of the DAG has an architecture, then use that.
Otherwise take the system's default architecture.
Intuition: Architectures won't be set a lot, and generally you
want the host system's architecture. When architectures are
mised in a spec, it is likely because the tool requries a
cross-compiled component, e.g. for tools that run on BlueGene
or Cray machines. These constraints will likely come directly
from packages, so require the user to be explicit if they want
to mess with the architecture, and revert to the default when
they're not explicit.
"""
if spec.architecture is not None:
return
if spec.root.architecture:
spec.architecture = spec.root.architecture
else:
spec.architecture = spack.architecture.sys_type()
def concretize_compiler(self, spec):
"""Currently just sets the compiler to gcc or throws an exception
if the compiler is set to something else.
TODO: implement below description.
If the spec already has a compiler, we're done. If not, then
take the compiler used for the nearest ancestor with a concrete
compiler, or use the system default if there is no ancestor
with a compiler.
Intuition: Use the system default if no package that depends on
this one has a strict compiler requirement. Otherwise, try to
build with the compiler that will be used by libraries that
link to this one, to maximize compatibility.
"""
if spec.compiler and spec.compiler.concrete:
if spec.compiler != spack.compilers.default_compiler():
raise spack.spec.UnknownCompilerError(str(spec.compiler))
else:
spec.compiler = spack.compilers.default_compiler()
def choose_provider(self, spec, providers):
"""This is invoked for virtual specs. Given a spec with a virtual name,
say "mpi", and a list of specs of possible providers of that spec,
select a provider and return it.
"""
assert(spec.virtual)
assert(providers)
index = spack.spec.index_specs(providers)
first_key = sorted(index.keys())[0]
latest_version = sorted(index[first_key])[-1]
return latest_version
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