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|
# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""
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.
"""
from __future__ import print_function
import os.path
import platform
import tempfile
from contextlib import contextmanager
from itertools import chain
from functools_backport import reverse_order
import archspec.cpu
import llnl.util.filesystem as fs
import llnl.util.lang
import llnl.util.tty as tty
import spack.abi
import spack.compilers
import spack.environment
import spack.error
import spack.platforms
import spack.repo
import spack.spec
import spack.target
import spack.tengine
import spack.variant as vt
from spack.config import config
from spack.package_prefs import PackagePrefs, is_spec_buildable, spec_externals
from spack.version import Version, VersionList, VersionRange, ver
#: impements rudimentary logic for ABI compatibility
_abi = llnl.util.lang.Singleton(lambda: spack.abi.ABI())
class Concretizer(object):
"""You can subclass this class to override some of the default
concretization strategies, or you can override all of them.
"""
#: Controls whether we check that compiler versions actually exist
#: during concretization. Used for testing and for mirror creation
check_for_compiler_existence = None
def __init__(self, abstract_spec=None):
if Concretizer.check_for_compiler_existence is None:
Concretizer.check_for_compiler_existence = not config.get(
'config:install_missing_compilers', False
)
self.abstract_spec = abstract_spec
self._adjust_target_answer_generator = None
def concretize_develop(self, spec):
"""
Add ``dev_path=*`` variant to packages built from local source.
"""
env = spack.environment.active_environment()
dev_info = env.dev_specs.get(spec.name, {}) if env else {}
if not dev_info:
return False
path = os.path.normpath(os.path.join(env.path, dev_info['path']))
if 'dev_path' in spec.variants:
assert spec.variants['dev_path'].value == path
changed = False
else:
spec.variants.setdefault(
'dev_path', vt.SingleValuedVariant('dev_path', path))
changed = True
changed |= spec.constrain(dev_info['spec'])
return changed
def _valid_virtuals_and_externals(self, spec):
"""Returns a list of candidate virtual dep providers and external
packages that coiuld be used to concretize a spec.
Preferred specs come first in the list.
"""
# First construct a list of concrete candidates to replace spec with.
candidates = [spec]
pref_key = lambda spec: 0 # no-op pref key
if spec.virtual:
candidates = spack.repo.path.providers_for(spec)
if not candidates:
raise spack.error.UnsatisfiableProviderSpecError(
candidates[0], spec)
# Find nearest spec in the DAG (up then down) that has prefs.
spec_w_prefs = find_spec(
spec, lambda p: PackagePrefs.has_preferred_providers(
p.name, spec.name),
spec) # default to spec itself.
# Create a key to sort candidates by the prefs we found
pref_key = PackagePrefs(spec_w_prefs.name, 'providers', spec.name)
# For each candidate package, if it has externals, add those
# to the usable list. if it's not buildable, then *only* add
# the externals.
usable = []
for cspec in candidates:
if is_spec_buildable(cspec):
usable.append(cspec)
externals = spec_externals(cspec)
for ext in externals:
if ext.satisfies(spec):
usable.append(ext)
# If nothing is in the usable list now, it's because we aren't
# allowed to build anything.
if not usable:
raise NoBuildError(spec)
# Use a sort key to order the results
return sorted(usable, key=lambda spec: (
not spec.external, # prefer externals
pref_key(spec), # respect prefs
spec.name, # group by name
reverse_order(spec.versions), # latest version
spec # natural order
))
def choose_virtual_or_external(self, spec):
"""Given a list of candidate virtual and external packages, try to
find one that is most ABI compatible.
"""
candidates = self._valid_virtuals_and_externals(spec)
if not candidates:
return candidates
# Find the nearest spec in the dag that has a compiler. We'll
# use that spec to calibrate compiler compatibility.
abi_exemplar = find_spec(spec, lambda x: x.compiler)
if abi_exemplar is None:
abi_exemplar = spec.root
# Sort candidates from most to least compatibility.
# We reverse because True > False.
# Sort is stable, so candidates keep their order.
return sorted(candidates,
reverse=True,
key=lambda spec: (
_abi.compatible(spec, abi_exemplar, loose=True),
_abi.compatible(spec, abi_exemplar)))
def concretize_version(self, spec):
"""If the spec is already concrete, return. Otherwise take
the preferred version from spackconfig, and default to the package's
version if there are no available versions.
TODO: In many cases we probably want to look for installed
versions of each package and use an installed version
if we can link to it. The policy implemented here will
tend to rebuild a lot of stuff becasue it will prefer
a compiler in the spec to any compiler already-
installed things were built with. There is likely
some better policy that finds some middle ground
between these two extremes.
"""
# return if already concrete.
if spec.versions.concrete:
return False
# List of versions we could consider, in sorted order
pkg_versions = spec.package_class.versions
usable = [v for v in pkg_versions
if any(v.satisfies(sv) for sv in spec.versions)]
yaml_prefs = PackagePrefs(spec.name, 'version')
# The keys below show the order of precedence of factors used
# to select a version when concretizing. The item with
# the "largest" key will be selected.
#
# NOTE: When COMPARING VERSIONS, the '@develop' version is always
# larger than other versions. BUT when CONCRETIZING,
# the largest NON-develop version is selected by default.
keyfn = lambda v: (
# ------- Special direction from the user
# Respect order listed in packages.yaml
-yaml_prefs(v),
# The preferred=True flag (packages or packages.yaml or both?)
pkg_versions.get(Version(v)).get('preferred', False),
# ------- Regular case: use latest non-develop version by default.
# Avoid @develop version, which would otherwise be the "largest"
# in straight version comparisons
not v.isdevelop(),
# Compare the version itself
# This includes the logic:
# a) develop > everything (disabled by "not v.isdevelop() above)
# b) numeric > non-numeric
# c) Numeric or string comparison
v)
usable.sort(key=keyfn, reverse=True)
if usable:
spec.versions = ver([usable[0]])
else:
# We don't know of any SAFE versions that match the given
# spec. Grab the spec's versions and grab the highest
# *non-open* part of the range of versions it specifies.
# Someone else can raise an error if this happens,
# e.g. when we go to fetch it and don't know how. But it
# *might* work.
if not spec.versions or spec.versions == VersionList([':']):
raise NoValidVersionError(spec)
else:
last = spec.versions[-1]
if isinstance(last, VersionRange):
if last.end:
spec.versions = ver([last.end])
else:
spec.versions = ver([last.start])
else:
spec.versions = ver([last])
return True # Things changed
def concretize_architecture(self, spec):
"""If the spec is empty provide the defaults of the platform. If the
architecture is not a string type, then check if either the platform,
target or operating system are concretized. If any of the fields are
changed then return True. If everything is concretized (i.e the
architecture attribute is a namedtuple of classes) then return False.
If the target is a string type, then convert the string into a
concretized architecture. If it has no architecture and the root of the
DAG has an architecture, then use the root otherwise use the defaults
on the platform.
"""
# ensure type safety for the architecture
if spec.architecture is None:
spec.architecture = spack.spec.ArchSpec()
if spec.architecture.concrete:
return False
# Get platform of nearest spec with a platform, including spec
# If spec has a platform, easy
if spec.architecture.platform:
new_plat = spack.platforms.by_name(spec.architecture.platform)
else:
# Else if anyone else has a platform, take the closest one
# Search up, then down, along build/link deps first
# Then any nearest. Algorithm from compilerspec search
platform_spec = find_spec(
spec, lambda x: x.architecture and x.architecture.platform
)
if platform_spec:
new_plat = spack.platforms.by_name(platform_spec.architecture.platform)
else:
# If no platform anywhere in this spec, grab the default
new_plat = spack.platforms.host()
# Get nearest spec with relevant platform and an os
# Generally, same algorithm as finding platform, except we only
# consider specs that have a platform
if spec.architecture.os:
new_os = spec.architecture.os
else:
new_os_spec = find_spec(
spec, lambda x: (x.architecture and
x.architecture.platform == str(new_plat) and
x.architecture.os)
)
if new_os_spec:
new_os = new_os_spec.architecture.os
else:
new_os = new_plat.operating_system('default_os')
# Get the nearest spec with relevant platform and a target
# Generally, same algorithm as finding os
curr_target = None
if spec.architecture.target:
curr_target = spec.architecture.target
if spec.architecture.target and spec.architecture.target_concrete:
new_target = spec.architecture.target
else:
new_target_spec = find_spec(
spec, lambda x: (x.architecture and
x.architecture.platform == str(new_plat) and
x.architecture.target and
x.architecture.target != curr_target)
)
if new_target_spec:
if curr_target:
# constrain one target by the other
new_target_arch = spack.spec.ArchSpec(
(None, None, new_target_spec.architecture.target))
curr_target_arch = spack.spec.ArchSpec(
(None, None, curr_target))
curr_target_arch.constrain(new_target_arch)
new_target = curr_target_arch.target
else:
new_target = new_target_spec.architecture.target
else:
# To get default platform, consider package prefs
if PackagePrefs.has_preferred_targets(spec.name):
new_target = self.target_from_package_preferences(spec)
else:
new_target = new_plat.target('default_target')
if curr_target:
# convert to ArchSpec to compare satisfaction
new_target_arch = spack.spec.ArchSpec(
(None, None, str(new_target)))
curr_target_arch = spack.spec.ArchSpec(
(None, None, str(curr_target)))
if not new_target_arch.satisfies(curr_target_arch):
# new_target is an incorrect guess based on preferences
# and/or default
valid_target_ranges = str(curr_target).split(',')
for target_range in valid_target_ranges:
t_min, t_sep, t_max = target_range.partition(':')
if not t_sep:
new_target = t_min
break
elif t_max:
new_target = t_max
break
elif t_min:
# TODO: something better than picking first
new_target = t_min
break
# Construct new architecture, compute whether spec changed
arch_spec = (str(new_plat), str(new_os), str(new_target))
new_arch = spack.spec.ArchSpec(arch_spec)
spec_changed = new_arch != spec.architecture
spec.architecture = new_arch
return spec_changed
def target_from_package_preferences(self, spec):
"""Returns the preferred target from the package preferences if
there's any.
Args:
spec: abstract spec to be concretized
"""
target_prefs = PackagePrefs(spec.name, 'target')
target_specs = [spack.spec.Spec('target=%s' % tname)
for tname in archspec.cpu.TARGETS]
def tspec_filter(s):
# Filter target specs by whether the architecture
# family is the current machine type. This ensures
# we only consider x86_64 targets when on an
# x86_64 machine, etc. This may need to change to
# enable setting cross compiling as a default
target = archspec.cpu.TARGETS[str(s.architecture.target)]
arch_family_name = target.family.name
return arch_family_name == platform.machine()
# Sort filtered targets by package prefs
target_specs = list(filter(tspec_filter, target_specs))
target_specs.sort(key=target_prefs)
new_target = target_specs[0].architecture.target
return new_target
def concretize_variants(self, spec):
"""If the spec already has variants filled in, return. Otherwise, add
the user preferences from packages.yaml or the default variants from
the package specification.
"""
changed = False
preferred_variants = PackagePrefs.preferred_variants(spec.name)
pkg_cls = spec.package_class
for name, variant in pkg_cls.variants.items():
var = spec.variants.get(name, None)
if var and '*' in var:
# remove variant wildcard before concretizing
# wildcard cannot be combined with other variables in a
# multivalue variant, a concrete variant cannot have the value
# wildcard, and a wildcard does not constrain a variant
spec.variants.pop(name)
if name not in spec.variants:
changed = True
if name in preferred_variants:
spec.variants[name] = preferred_variants.get(name)
else:
spec.variants[name] = variant.make_default()
return changed
def concretize_compiler(self, spec):
"""If the spec already has a compiler, we're done. If not, then take
the compiler used for the nearest ancestor with a compiler
spec and use that. If the ancestor's compiler is not
concrete, then used the preferred compiler as specified in
spackconfig.
Intuition: Use the spackconfig 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.
"""
# Pass on concretizing the compiler if the target or operating system
# is not yet determined
if not spec.architecture.concrete:
# We haven't changed, but other changes need to happen before we
# continue. `return True` here to force concretization to keep
# running.
return True
# Only use a matching compiler if it is of the proper style
# Takes advantage of the proper logic already existing in
# compiler_for_spec Should think whether this can be more
# efficient
def _proper_compiler_style(cspec, aspec):
compilers = spack.compilers.compilers_for_spec(
cspec, arch_spec=aspec
)
# If the spec passed as argument is concrete we want to check
# the versions match exactly
if (cspec.concrete and compilers and
cspec.version not in [c.version for c in compilers]):
return []
return compilers
if spec.compiler and spec.compiler.concrete:
if (self.check_for_compiler_existence and not
_proper_compiler_style(spec.compiler, spec.architecture)):
_compiler_concretization_failure(
spec.compiler, spec.architecture)
return False
# Find another spec that has a compiler, or the root if none do
other_spec = spec if spec.compiler else find_spec(
spec, lambda x: x.compiler, spec.root)
other_compiler = other_spec.compiler
assert other_spec
# Check if the compiler is already fully specified
if other_compiler and other_compiler.concrete:
if (self.check_for_compiler_existence and not
_proper_compiler_style(other_compiler, spec.architecture)):
_compiler_concretization_failure(
other_compiler, spec.architecture)
spec.compiler = other_compiler
return True
if other_compiler: # Another node has abstract compiler information
compiler_list = spack.compilers.find_specs_by_arch(
other_compiler, spec.architecture
)
if not compiler_list:
# We don't have a matching compiler installed
if not self.check_for_compiler_existence:
# Concretize compiler spec versions as a package to build
cpkg_spec = spack.compilers.pkg_spec_for_compiler(
other_compiler
)
self.concretize_version(cpkg_spec)
spec.compiler = spack.spec.CompilerSpec(
other_compiler.name, cpkg_spec.versions)
return True
else:
# No compiler with a satisfactory spec was found
raise UnavailableCompilerVersionError(
other_compiler, spec.architecture
)
else:
# We have no hints to go by, grab any compiler
compiler_list = spack.compilers.all_compiler_specs()
if not compiler_list:
# Spack has no compilers.
raise spack.compilers.NoCompilersError()
# By default, prefer later versions of compilers
compiler_list = sorted(
compiler_list, key=lambda x: (x.name, x.version), reverse=True)
ppk = PackagePrefs(other_spec.name, 'compiler')
matches = sorted(compiler_list, key=ppk)
# copy concrete version into other_compiler
try:
spec.compiler = next(
c for c in matches
if _proper_compiler_style(c, spec.architecture)).copy()
except StopIteration:
# No compiler with a satisfactory spec has a suitable arch
_compiler_concretization_failure(
other_compiler, spec.architecture)
assert spec.compiler.concrete
return True # things changed.
def concretize_compiler_flags(self, spec):
"""
The compiler flags are updated to match those of the spec whose
compiler is used, defaulting to no compiler flags in the spec.
Default specs set at the compiler level will still be added later.
"""
# Pass on concretizing the compiler flags if the target or operating
# system is not set.
if not spec.architecture.concrete:
# We haven't changed, but other changes need to happen before we
# continue. `return True` here to force concretization to keep
# running.
return True
compiler_match = lambda other: (
spec.compiler == other.compiler and
spec.architecture == other.architecture)
ret = False
for flag in spack.spec.FlagMap.valid_compiler_flags():
if flag not in spec.compiler_flags:
spec.compiler_flags[flag] = list()
try:
nearest = next(p for p in spec.traverse(direction='parents')
if (compiler_match(p) and
(p is not spec) and
flag in p.compiler_flags))
nearest_flags = nearest.compiler_flags.get(flag, [])
flags = spec.compiler_flags.get(flag, [])
if set(nearest_flags) - set(flags):
spec.compiler_flags[flag] = list(
llnl.util.lang.dedupe(nearest_flags + flags)
)
ret = True
except StopIteration:
pass
# Include the compiler flag defaults from the config files
# This ensures that spack will detect conflicts that stem from a change
# in default compiler flags.
try:
compiler = spack.compilers.compiler_for_spec(
spec.compiler, spec.architecture)
except spack.compilers.NoCompilerForSpecError:
if self.check_for_compiler_existence:
raise
return ret
for flag in compiler.flags:
config_flags = compiler.flags.get(flag, [])
flags = spec.compiler_flags.get(flag, [])
spec.compiler_flags[flag] = list(
llnl.util.lang.dedupe(config_flags + flags)
)
if set(config_flags) - set(flags):
ret = True
return ret
def adjust_target(self, spec):
"""Adjusts the target microarchitecture if the compiler is too old
to support the default one.
Args:
spec: spec to be concretized
Returns:
True if spec was modified, False otherwise
"""
# To minimize the impact on performance this function will attempt
# to adjust the target only at the very first call once necessary
# information is set. It will just return False on subsequent calls.
# The way this is achieved is by initializing a generator and making
# this function return the next answer.
if not (spec.architecture and spec.architecture.concrete):
# Not ready, but keep going because we have work to do later
return True
def _make_only_one_call(spec):
yield self._adjust_target(spec)
while True:
yield False
if self._adjust_target_answer_generator is None:
self._adjust_target_answer_generator = _make_only_one_call(spec)
return next(self._adjust_target_answer_generator)
def _adjust_target(self, spec):
"""Assumes that the architecture and the compiler have been
set already and checks if the current target microarchitecture
is the default and can be optimized by the compiler.
If not, downgrades the microarchitecture until a suitable one
is found. If none can be found raise an error.
Args:
spec: spec to be concretized
Returns:
True if any modification happened, False otherwise
"""
import archspec.cpu
# Try to adjust the target only if it is the default
# target for this platform
current_target = spec.architecture.target
current_platform = spack.platforms.by_name(spec.architecture.platform)
default_target = current_platform.target('default_target')
if PackagePrefs.has_preferred_targets(spec.name):
default_target = self.target_from_package_preferences(spec)
if current_target != default_target or (
self.abstract_spec and
self.abstract_spec.architecture and
self.abstract_spec.architecture.concrete):
return False
try:
current_target.optimization_flags(spec.compiler)
except archspec.cpu.UnsupportedMicroarchitecture:
microarchitecture = current_target.microarchitecture
for ancestor in microarchitecture.ancestors:
candidate = None
try:
candidate = spack.target.Target(ancestor)
candidate.optimization_flags(spec.compiler)
except archspec.cpu.UnsupportedMicroarchitecture:
continue
if candidate is not None:
msg = ('{0.name}@{0.version} cannot build optimized '
'binaries for "{1}". Using best target possible: '
'"{2}"')
msg = msg.format(spec.compiler, current_target, candidate)
tty.warn(msg)
spec.architecture.target = candidate
return True
else:
raise
return False
@contextmanager
def disable_compiler_existence_check():
saved = Concretizer.check_for_compiler_existence
Concretizer.check_for_compiler_existence = False
yield
Concretizer.check_for_compiler_existence = saved
@contextmanager
def enable_compiler_existence_check():
saved = Concretizer.check_for_compiler_existence
Concretizer.check_for_compiler_existence = True
yield
Concretizer.check_for_compiler_existence = saved
def find_spec(spec, condition, default=None):
"""Searches the dag from spec in an intelligent order and looks
for a spec that matches a condition"""
# First search parents, then search children
deptype = ('build', 'link')
dagiter = chain(
spec.traverse(direction='parents', deptype=deptype, root=False),
spec.traverse(direction='children', deptype=deptype, root=False))
visited = set()
for relative in dagiter:
if condition(relative):
return relative
visited.add(id(relative))
# Then search all other relatives in the DAG *except* spec
for relative in spec.root.traverse(deptypes=all):
if relative is spec:
continue
if id(relative) in visited:
continue
if condition(relative):
return relative
# Finally search spec itself.
if condition(spec):
return spec
return default # Nothing matched the condition; return default.
def _compiler_concretization_failure(compiler_spec, arch):
# Distinguish between the case that there are compilers for
# the arch but not with the given compiler spec and the case that
# there are no compilers for the arch at all
if not spack.compilers.compilers_for_arch(arch):
available_os_targets = set(
(c.operating_system, c.target) for c in
spack.compilers.all_compilers())
raise NoCompilersForArchError(arch, available_os_targets)
else:
raise UnavailableCompilerVersionError(compiler_spec, arch)
def concretize_specs_together(*abstract_specs, **kwargs):
"""Given a number of specs as input, tries to concretize them together.
Args:
tests (bool or list or set): False to run no tests, True to test
all packages, or a list of package names to run tests for some
*abstract_specs: abstract specs to be concretized, given either
as Specs or strings
Returns:
List of concretized specs
"""
if spack.config.get('config:concretizer') == 'original':
return _concretize_specs_together_original(*abstract_specs, **kwargs)
return _concretize_specs_together_new(*abstract_specs, **kwargs)
def _concretize_specs_together_new(*abstract_specs, **kwargs):
import spack.solver.asp
result = spack.solver.asp.solve(abstract_specs)
if not result.satisfiable:
result.print_cores()
tty.die("Unsatisfiable spec.")
return [s.copy() for s in result.specs]
def _concretize_specs_together_original(*abstract_specs, **kwargs):
def make_concretization_repository(abstract_specs):
"""Returns the path to a temporary repository created to contain
a fake package that depends on all of the abstract specs.
"""
tmpdir = tempfile.mkdtemp()
repo_path, _ = spack.repo.create_repo(tmpdir)
debug_msg = '[CONCRETIZATION]: Creating helper repository in {0}'
tty.debug(debug_msg.format(repo_path))
pkg_dir = os.path.join(repo_path, 'packages', 'concretizationroot')
fs.mkdirp(pkg_dir)
environment = spack.tengine.make_environment()
template = environment.get_template('misc/coconcretization.pyt')
# Split recursive specs, as it seems the concretizer has issue
# respecting conditions on dependents expressed like
# depends_on('foo ^bar@1.0'), see issue #11160
split_specs = [dep.copy(deps=False)
for spec in abstract_specs
for dep in spec.traverse(root=True)]
with open(os.path.join(pkg_dir, 'package.py'), 'w') as f:
f.write(template.render(specs=[str(s) for s in split_specs]))
return spack.repo.Repo(repo_path)
abstract_specs = [spack.spec.Spec(s) for s in abstract_specs]
concretization_repository = make_concretization_repository(abstract_specs)
with spack.repo.additional_repository(concretization_repository):
# Spec from a helper package that depends on all the abstract_specs
concretization_root = spack.spec.Spec('concretizationroot')
concretization_root.concretize(tests=kwargs.get('tests', False))
# Retrieve the direct dependencies
concrete_specs = [
concretization_root[spec.name].copy() for spec in abstract_specs
]
return concrete_specs
class NoCompilersForArchError(spack.error.SpackError):
def __init__(self, arch, available_os_targets):
err_msg = ("No compilers found"
" for operating system %s and target %s."
"\nIf previous installations have succeeded, the"
" operating system may have been updated." %
(arch.os, arch.target))
available_os_target_strs = list()
for operating_system, t in available_os_targets:
os_target_str = "%s-%s" % (operating_system, t) if t \
else operating_system
available_os_target_strs.append(os_target_str)
err_msg += (
"\nCompilers are defined for the following"
" operating systems and targets:\n\t" +
"\n\t".join(available_os_target_strs))
super(NoCompilersForArchError, self).__init__(
err_msg, "Run 'spack compiler find' to add compilers.")
class UnavailableCompilerVersionError(spack.error.SpackError):
"""Raised when there is no available compiler that satisfies a
compiler spec."""
def __init__(self, compiler_spec, arch=None):
err_msg = "No compilers with spec {0} found".format(compiler_spec)
if arch:
err_msg += " for operating system {0} and target {1}.".format(
arch.os, arch.target
)
super(UnavailableCompilerVersionError, self).__init__(
err_msg, "Run 'spack compiler find' to add compilers or "
"'spack compilers' to see which compilers are already recognized"
" by spack.")
class NoValidVersionError(spack.error.SpackError):
"""Raised when there is no way to have a concrete version for a
particular spec."""
def __init__(self, spec):
super(NoValidVersionError, self).__init__(
"There are no valid versions for %s that match '%s'"
% (spec.name, spec.versions))
class InsufficientArchitectureInfoError(spack.error.SpackError):
"""Raised when details on architecture cannot be collected from the
system"""
def __init__(self, spec, archs):
super(InsufficientArchitectureInfoError, self).__init__(
"Cannot determine necessary architecture information for '%s': %s"
% (spec.name, str(archs)))
class NoBuildError(spack.error.SpecError):
"""Raised when a package is configured with the buildable option False, but
no satisfactory external versions can be found
"""
def __init__(self, spec):
msg = ("The spec\n '%s'\n is configured as not buildable, "
"and no matching external installs were found")
super(NoBuildError, self).__init__(msg % spec)
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