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boost: add support for alternate boost-context backends (#30496)

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The fcontext backend is the default high-performance backend.
The ucontext backend is needed when using Boost context in conjunction with ASAN.
The WinFibers backend...also exists.

https://www.boost.org/doc/libs/1_79_0/libs/context/doc/html/context/cc/implementations__fcontext_t__ucontext_t_and_winfiber.html
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Thomas Dickerson 2022-05-06 10:14:45 -04:00 committed by GitHub
parent 17c32811fb
commit 6c6685b5fa
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1 changed files with 20 additions and 0 deletions
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20
var/spack/repos/builtin/packages/boost/package.py
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@ -156,6 +156,13 @@ def libs(self):
libraries, root=self.prefix, shared=shared, recursive=True
)
variant('context-impl',
default='fcontext',
values=('fcontext', 'ucontext', 'winfib'),
multi=False,
description='Use the specified backend for boost-context',
when='+context')
variant('cxxstd',
default='98',
values=(
@ -481,6 +488,10 @@ def determine_b2_options(self, spec, options):
raise RuntimeError("At least one of {singlethreaded, " +
"multithreaded} must be enabled")
# If we are building context, tell b2 which backend to use
if '+context' in spec:
options.extend(['context-impl=%s' % spec.variants['context-impl'].value])
if '+taggedlayout' in spec:
layout = 'tagged'
elif '+versionedlayout' in spec:
@ -667,3 +678,12 @@ def _cmake_args(self):
return ['-DBoost_NO_BOOST_CMAKE=ON'] + args_fn(self)
type(dependent_spec.package).cmake_args = _cmake_args
def setup_dependent_build_environment(self, env, dependent_spec):
if '+context' in self.spec:
context_impl = self.spec.variants['context-impl'].value
# fcontext, as the default, has no corresponding macro
if context_impl == 'ucontext':
env.append_flags('CXXFLAGS', '-DBOOST_USE_UCONTEXT')
elif context_impl == 'winfib':
env.append_flags('CXXFLAGS', '-DBOOST_USE_WINFIB')