relnotes: add entry for `hg diff --merge -c`
Differential Revision: https://phab.mercurial-scm.org/D9944
# Copyright (c) 2016-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
import distutils.ccompiler
import os
from distutils.extension import Extension
zstd_sources = [
"zstd/%s" % p
for p in (
"common/debug.c",
"common/entropy_common.c",
"common/error_private.c",
"common/fse_decompress.c",
"common/pool.c",
"common/threading.c",
"common/xxhash.c",
"common/zstd_common.c",
"compress/fse_compress.c",
"compress/hist.c",
"compress/huf_compress.c",
"compress/zstd_compress_literals.c",
"compress/zstd_compress_sequences.c",
"compress/zstd_compress.c",
"compress/zstd_double_fast.c",
"compress/zstd_fast.c",
"compress/zstd_lazy.c",
"compress/zstd_ldm.c",
"compress/zstd_opt.c",
"compress/zstdmt_compress.c",
"decompress/huf_decompress.c",
"decompress/zstd_ddict.c",
"decompress/zstd_decompress.c",
"decompress/zstd_decompress_block.c",
"dictBuilder/cover.c",
"dictBuilder/divsufsort.c",
"dictBuilder/fastcover.c",
"dictBuilder/zdict.c",
)
]
zstd_sources_legacy = [
"zstd/%s" % p
for p in (
"deprecated/zbuff_common.c",
"deprecated/zbuff_compress.c",
"deprecated/zbuff_decompress.c",
"legacy/zstd_v01.c",
"legacy/zstd_v02.c",
"legacy/zstd_v03.c",
"legacy/zstd_v04.c",
"legacy/zstd_v05.c",
"legacy/zstd_v06.c",
"legacy/zstd_v07.c",
)
]
zstd_includes = [
"zstd",
"zstd/common",
"zstd/compress",
"zstd/decompress",
"zstd/dictBuilder",
]
zstd_includes_legacy = [
"zstd/deprecated",
"zstd/legacy",
]
ext_includes = [
"c-ext",
"zstd/common",
]
ext_sources = [
"zstd/common/error_private.c",
"zstd/common/pool.c",
"zstd/common/threading.c",
"zstd/common/zstd_common.c",
"zstd.c",
"c-ext/bufferutil.c",
"c-ext/compressiondict.c",
"c-ext/compressobj.c",
"c-ext/compressor.c",
"c-ext/compressoriterator.c",
"c-ext/compressionchunker.c",
"c-ext/compressionparams.c",
"c-ext/compressionreader.c",
"c-ext/compressionwriter.c",
"c-ext/constants.c",
"c-ext/decompressobj.c",
"c-ext/decompressor.c",
"c-ext/decompressoriterator.c",
"c-ext/decompressionreader.c",
"c-ext/decompressionwriter.c",
"c-ext/frameparams.c",
]
zstd_depends = [
"c-ext/python-zstandard.h",
]
def get_c_extension(
support_legacy=False,
system_zstd=False,
name="zstd",
warnings_as_errors=False,
root=None,
):
"""Obtain a distutils.extension.Extension for the C extension.
``support_legacy`` controls whether to compile in legacy zstd format support.
``system_zstd`` controls whether to compile against the system zstd library.
For this to work, the system zstd library and headers must match what
python-zstandard is coded against exactly.
``name`` is the module name of the C extension to produce.
``warnings_as_errors`` controls whether compiler warnings are turned into
compiler errors.
``root`` defines a root path that source should be computed as relative
to. This should be the directory with the main ``setup.py`` that is
being invoked. If not defined, paths will be relative to this file.
"""
actual_root = os.path.abspath(os.path.dirname(__file__))
root = root or actual_root
sources = set([os.path.join(actual_root, p) for p in ext_sources])
if not system_zstd:
sources.update([os.path.join(actual_root, p) for p in zstd_sources])
if support_legacy:
sources.update(
[os.path.join(actual_root, p) for p in zstd_sources_legacy]
)
sources = list(sources)
include_dirs = set([os.path.join(actual_root, d) for d in ext_includes])
if not system_zstd:
include_dirs.update(
[os.path.join(actual_root, d) for d in zstd_includes]
)
if support_legacy:
include_dirs.update(
[os.path.join(actual_root, d) for d in zstd_includes_legacy]
)
include_dirs = list(include_dirs)
depends = [os.path.join(actual_root, p) for p in zstd_depends]
compiler = distutils.ccompiler.new_compiler()
# Needed for MSVC.
if hasattr(compiler, "initialize"):
compiler.initialize()
if compiler.compiler_type == "unix":
compiler_type = "unix"
elif compiler.compiler_type == "msvc":
compiler_type = "msvc"
elif compiler.compiler_type == "mingw32":
compiler_type = "mingw32"
else:
raise Exception("unhandled compiler type: %s" % compiler.compiler_type)
extra_args = ["-DZSTD_MULTITHREAD"]
if not system_zstd:
extra_args.append("-DZSTDLIB_VISIBILITY=")
extra_args.append("-DZDICTLIB_VISIBILITY=")
extra_args.append("-DZSTDERRORLIB_VISIBILITY=")
if compiler_type == "unix":
extra_args.append("-fvisibility=hidden")
if not system_zstd and support_legacy:
extra_args.append("-DZSTD_LEGACY_SUPPORT=1")
if warnings_as_errors:
if compiler_type in ("unix", "mingw32"):
extra_args.append("-Werror")
elif compiler_type == "msvc":
extra_args.append("/WX")
else:
assert False
libraries = ["zstd"] if system_zstd else []
# Python 3.7 doesn't like absolute paths. So normalize to relative.
sources = [os.path.relpath(p, root) for p in sources]
include_dirs = [os.path.relpath(p, root) for p in include_dirs]
depends = [os.path.relpath(p, root) for p in depends]
# TODO compile with optimizations.
return Extension(
name,
sources,
include_dirs=include_dirs,
depends=depends,
extra_compile_args=extra_args,
libraries=libraries,
)