75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
# Copyright 2013-2024 Lawrence Livermore National Security, LLC and other
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# Spack Project Developers. See the top-level COPYRIGHT file for details.
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#
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# SPDX-License-Identifier: (Apache-2.0 OR MIT)
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from spack.package import *
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class AppleLibunwind(Package):
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"""Placeholder package for Apple's analogue to non-GNU libunwind"""
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homepage = "https://opensource.apple.com/source/libunwind/libunwind-35.3/"
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provides("unwind")
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# The 'conflicts' directive only accepts valid spack specs;
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# platforms cannot be negated -- 'platform!=darwin' is not a valid
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# spec -- so expressing a conflict for any platform that isn't
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# Darwin must be expressed by listing a conflict with every
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# platform that isn't Darwin/macOS
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conflicts("platform=linux")
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# Override the fetcher method to throw a useful error message;
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# avoids GitHub issue (#7061) in which the opengl placeholder
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# package threw a generic, uninformative error during the `fetch`
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# step,
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@property
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def fetcher(self):
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msg = """This package is intended to be a placeholder for Apple's
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system-provided, non-GNU-compatible libunwind library.
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Add to your packages.yaml:
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packages:
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apple-libunwind:
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buildable: False
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externals:
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- spec: apple-libunwind@35.3
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prefix: /usr
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"""
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raise InstallError(msg)
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@fetcher.setter # Since fetcher is read-write, must override both
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def fetcher(self):
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_ = self.fetcher
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def install(self, spec, prefix):
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# sanity_check_prefix requires something in the install directory
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mkdirp(prefix.lib)
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@property
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def libs(self):
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"""Export the Apple libunwind library. The Apple libunwind library
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cannot be linked to directly using an absolute path; doing so
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will cause the linker to throw an error 'cannot link directly
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with /usr/lib/system/libunwind.dylib' and the linker will
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suggest linking with System.framework instead. Linking to this
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framework is equivalent to linking with libSystem.dylib, which
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can be confirmed on a macOS system by executing at a terminal
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the command `ls -l
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/System/Library/Frameworks/System.Framework` -- the file
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"System" is a symlink to `/usr/lib/libSystem.B.dylib`, and
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`/usr/lib/libSystem.dylib` also symlinks to this file.
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Running `otool -L /usr/lib/libSystem.dylib` confirms that
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it will link dynamically to `/usr/lib/system/libunwind.dylib`.
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"""
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return find_libraries("libSystem", self.prefix.lib, shared=True, recursive=False)
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@property
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def headers(self):
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"""Export the Apple libunwind header"""
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return HeaderList(find(self.prefix.include, "libunwind.h", recursive=False))
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