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# Copyright 2013-2024 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)
from spack.package import *
class AppleLibunwind(Package):
"""Placeholder package for Apple's analogue to non-GNU libunwind"""
homepage = "https://opensource.apple.com/source/libunwind/libunwind-35.3/"
provides("unwind")
# The 'conflicts' directive only accepts valid spack specs;
# platforms cannot be negated -- 'platform!=darwin' is not a valid
# spec -- so expressing a conflict for any platform that isn't
# Darwin must be expressed by listing a conflict with every
# platform that isn't Darwin/macOS
conflicts("platform=linux")
conflicts("platform=cray")
# Override the fetcher method to throw a useful error message;
# avoids GitHub issue (#7061) in which the opengl placeholder
# package threw a generic, uninformative error during the `fetch`
# step,
@property
def fetcher(self):
msg = """This package is intended to be a placeholder for Apple's
system-provided, non-GNU-compatible libunwind library.
Add to your packages.yaml:
packages:
apple-libunwind:
buildable: False
externals:
- spec: apple-libunwind@35.3
prefix: /usr
"""
raise InstallError(msg)
@fetcher.setter # Since fetcher is read-write, must override both
def fetcher(self):
_ = self.fetcher
def install(self, spec, prefix):
# sanity_check_prefix requires something in the install directory
mkdirp(prefix.lib)
@property
def libs(self):
"""Export the Apple libunwind library. The Apple libunwind library
cannot be linked to directly using an absolute path; doing so
will cause the linker to throw an error 'cannot link directly
with /usr/lib/system/libunwind.dylib' and the linker will
suggest linking with System.framework instead. Linking to this
framework is equivalent to linking with libSystem.dylib, which
can be confirmed on a macOS system by executing at a terminal
the command `ls -l
/System/Library/Frameworks/System.Framework` -- the file
"System" is a symlink to `/usr/lib/libSystem.B.dylib`, and
`/usr/lib/libSystem.dylib` also symlinks to this file.
Running `otool -L /usr/lib/libSystem.dylib` confirms that
it will link dynamically to `/usr/lib/system/libunwind.dylib`.
"""
libs = find_libraries("libSystem", self.prefix.lib, shared=True, recursive=False)
if libs:
return libs
return None
@property
def headers(self):
"""Export the Apple libunwind header"""
hdrs = HeaderList(find(self.prefix.include, "libunwind.h", recursive=False))
return hdrs or None
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