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6e02e2e452
we can't know the encoding header file authors will use, so using binary for our simple checks is the safest way.
72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
# Support code for building a C extension with lz4 files
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#
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# Copyright (c) 2016-present, Gregory Szorc (original code for zstd)
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# 2017-present, Thomas Waldmann (mods to make it more generic, code for lz4)
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# All rights reserved.
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#
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# This software may be modified and distributed under the terms
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# of the BSD license. See the LICENSE file for details.
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import os
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# lz4 files, structure as seen in lz4 project repository:
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lz4_sources = [
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'lib/lz4.c',
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]
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lz4_includes = [
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'lib',
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]
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def lz4_system_prefix(prefixes):
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for prefix in prefixes:
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filename = os.path.join(prefix, 'include', 'lz4.h')
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if os.path.exists(filename):
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with open(filename, 'rb') as fd:
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if b'LZ4_compress_default' in fd.read(): # requires lz4 >= 1.7.0 (r129)
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return prefix
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def lz4_ext_kwargs(bundled_path, system_prefix=None, system=False, **kwargs):
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"""amend kwargs with lz4 stuff for a distutils.extension.Extension initialization.
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bundled_path: relative (to this file) path to the bundled library source code files
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system_prefix: where the system-installed library can be found
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system: True: use the system-installed shared library, False: use the bundled library code
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kwargs: distutils.extension.Extension kwargs that should be amended
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returns: amended kwargs
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"""
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def multi_join(paths, *path_segments):
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"""apply os.path.join on a list of paths"""
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return [os.path.join(*(path_segments + (path, ))) for path in paths]
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use_system = system and system_prefix is not None
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sources = kwargs.get('sources', [])
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if not use_system:
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sources += multi_join(lz4_sources, bundled_path)
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include_dirs = kwargs.get('include_dirs', [])
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if use_system:
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include_dirs += multi_join(['include'], system_prefix)
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else:
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include_dirs += multi_join(lz4_includes, bundled_path)
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library_dirs = kwargs.get('library_dirs', [])
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if use_system:
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library_dirs += multi_join(['lib'], system_prefix)
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libraries = kwargs.get('libraries', [])
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if use_system:
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libraries += ['lz4', ]
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extra_compile_args = kwargs.get('extra_compile_args', [])
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if not use_system:
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extra_compile_args += [] # not used yet
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ret = dict(**kwargs)
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ret.update(dict(sources=sources, extra_compile_args=extra_compile_args,
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include_dirs=include_dirs, library_dirs=library_dirs, libraries=libraries))
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return ret
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