mirror of https://github.com/pyodide/pyodide.git
375 lines
11 KiB
Python
Executable File
375 lines
11 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Helper for cross-compiling distutils-based Python extensions.
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distutils has never had a proper cross-compilation story. This is a hack, which
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miraculously works, to get around that.
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The gist is:
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- Compile the package natively, replacing calls to the compiler and linker with
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wrappers that store the arguments in a log, and then delegate along to the
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real native compiler and linker.
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- Remove all of the native build products.
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- Play back the log, replacing the native compiler with emscripten and
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adjusting include paths and flags as necessary for cross-compiling to
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emscripten. This overwrites the results from the original native compilation.
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While this results in more work than strictly necessary (it builds a native
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version of the package, even though we then throw it away), it seems to be the
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only reliable way to automatically build a package that interleaves
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configuration with build.
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"""
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import argparse
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import importlib.machinery
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import json
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import os
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from pathlib import Path
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import re
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import subprocess
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import sys
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# absolute import is necessary as this file will be symlinked
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# under tools
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from pyodide_build import common
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ROOTDIR = common.ROOTDIR
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symlinks = set(['cc', 'c++', 'ld', 'ar', 'gcc'])
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symlinks = set(['cc', 'c++', 'ld', 'ar', 'gcc', 'gfortran'])
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def collect_args(basename):
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"""
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This is called when this script is called through a symlink that looks like
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a compiler or linker.
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It writes the arguments to the build.log, and then delegates to the real
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native compiler or linker.
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"""
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# Remove the symlink compiler from the PATH, so we can delegate to the
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# native compiler
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env = dict(os.environ)
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path = env['PATH']
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while str(ROOTDIR) + ':' in path:
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path = path.replace(str(ROOTDIR) + ':', '')
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env['PATH'] = path
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skip_host = 'SKIP_HOST' in os.environ
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# Skip compilations of C/Fortran extensions for the target environement.
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# We still need to generate the output files for distutils to continue
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# the build.
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# TODO: This may need slight tuning for new projects. In particular,
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# currently ar is not skipped, so a known failure would happen when
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# we create some object files (that are empty as gcc is skipped), on
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# which we run the actual ar command.
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skip = False
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if (basename in ['gcc', 'cc', 'c++', 'gfortran', 'ld']
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and '-o' in sys.argv[1:]
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# do not skip numpy as it is needed as build time
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# dependency by other packages (e.g. matplotlib)
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and skip_host):
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out_idx = sys.argv.index('-o')
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if (out_idx + 1) < len(sys.argv):
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# get the index of the output file path
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out_idx += 1
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with open(sys.argv[out_idx], 'wb') as fh:
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fh.write(b'')
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skip = True
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with open('build.log', 'a') as fd:
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# TODO: store skip status in the build.log
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json.dump([basename] + sys.argv[1:], fd)
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fd.write('\n')
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if skip:
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sys.exit(0)
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sys.exit(
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subprocess.run(
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[basename] + sys.argv[1:],
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env=env).returncode)
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def make_symlinks(env):
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"""
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Makes sure all of the symlinks that make this script look like a compiler
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exist.
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"""
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exec_path = Path(__file__).resolve()
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for symlink in symlinks:
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symlink_path = ROOTDIR / symlink
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if os.path.lexists(symlink_path) and not symlink_path.exists():
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# remove broken symlink so it can be re-created
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symlink_path.unlink()
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if not symlink_path.exists():
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symlink_path.symlink_to(exec_path)
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if symlink == 'c++':
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var = 'CXX'
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else:
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var = symlink.upper()
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env[var] = symlink
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def capture_compile(args):
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env = dict(os.environ)
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make_symlinks(env)
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env['PATH'] = str(ROOTDIR) + ':' + os.environ['PATH']
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result = subprocess.run(
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[Path(args.host) / 'bin' / 'python3',
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'setup.py',
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'install'], env=env)
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if result.returncode != 0:
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build_log_path = Path('build.log')
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if build_log_path.exists():
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build_log_path.unlink()
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sys.exit(result.returncode)
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def f2c(args, dryrun=False):
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"""Apply f2c to compilation arguments
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Parameters
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----------
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args : iterable
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input compiler arguments
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dryrun : bool, default=True
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if False run f2c on detected fortran files
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Returns
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-------
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new_args : list
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output compiler arguments
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Examples
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--------
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>>> f2c(['gfortran', 'test.f'], dryrun=True)
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['gfortran', 'test.c']
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"""
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new_args = []
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found_source = False
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for arg in args:
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if arg.endswith('.f'):
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filename = os.path.abspath(arg)
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if not dryrun:
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subprocess.check_call(
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['f2c', os.path.basename(filename)],
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cwd=os.path.dirname(filename))
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new_args.append(arg[:-2] + '.c')
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found_source = True
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else:
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new_args.append(arg)
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new_args_str = ' '.join(args)
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if ".so" in new_args_str and "libgfortran.so" not in new_args_str:
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found_source = True
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if not found_source:
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print(f'f2c: source not found, skipping: {new_args_str}')
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return None
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return new_args
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def handle_command(line, args, dryrun=False):
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"""Handle a compilation command
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Parameters
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----------
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line : iterable
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an iterable with the compilation arguments
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args : {object, namedtuple}
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an container with additional compilation options,
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in particular containing ``args.cflags`` and ``args.ldflags``
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dryrun : bool, default=False
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if True do not run the resulting command, only return it
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Examples
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--------
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>>> from collections import namedtuple
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>>> Args = namedtuple('args', ['cflags', 'ldflags'])
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>>> args = Args(cflags='', ldflags='')
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>>> handle_command(['gcc', 'test.c'], args, dryrun=True)
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emcc test.c
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['emcc', 'test.c']
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"""
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# This is a special case to skip the compilation tests in numpy that aren't
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# actually part of the build
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for arg in line:
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if r'/file.c' in arg or '_configtest' in arg:
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return
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if re.match(r'/tmp/.*/source\.[bco]+', arg):
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return
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if arg == '-print-multiarch':
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return
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if line[0] == 'gfortran':
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result = f2c(line)
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if result is None:
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return
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line = result
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new_args = ['emcc']
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elif line[0] == 'ar':
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new_args = ['emar']
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elif line[0] == 'c++':
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new_args = ['em++']
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else:
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new_args = ['emcc']
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# distutils doesn't use the c++ compiler when compiling c++ <sigh>
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if any(arg.endswith('.cpp') for arg in line):
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new_args = ['em++']
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shared = '-shared' in line
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if shared:
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new_args.extend(args.ldflags.split())
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elif new_args[0] in ('emcc', 'em++'):
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new_args.extend(args.cflags.split())
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# Go through and adjust arguments
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for arg in line[1:]:
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if arg.startswith('-I'):
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# Don't include any system directories
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if arg[2:].startswith('/usr'):
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continue
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if (str(Path(arg[2:]).resolve()).startswith(args.host) and
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'site-packages' not in arg):
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arg = arg.replace('-I' + args.host, '-I' + args.target)
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# Don't include any system directories
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if arg.startswith('-L/usr'):
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continue
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# The native build is possibly multithreaded, but the emscripten one
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# definitely isn't
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arg = re.sub(r'/python([0-9]\.[0-9]+)m', r'/python\1', arg)
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if arg.endswith('.o'):
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arg = arg[:-2] + '.bc'
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output = arg
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elif shared and arg.endswith('.so'):
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arg = arg[:-3] + '.wasm'
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output = arg
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new_args.append(arg)
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# This can only be used for incremental rebuilds -- it generates
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# an error during clean build of numpy
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# if os.path.isfile(output):
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# print('SKIPPING: ' + ' '.join(new_args))
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# return
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print(' '.join(new_args))
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if not dryrun:
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result = subprocess.run(new_args)
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if result.returncode != 0:
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sys.exit(result.returncode)
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# Emscripten .so files shouldn't have the native platform slug
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if shared:
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renamed = output[:-5] + '.so'
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for ext in importlib.machinery.EXTENSION_SUFFIXES:
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if ext == '.so':
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continue
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if renamed.endswith(ext):
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renamed = renamed[:-len(ext)] + '.so'
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break
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if not dryrun:
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os.rename(output, renamed)
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return new_args
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def replay_compile(args):
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# If pure Python, there will be no build.log file, which is fine -- just do
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# nothing
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build_log_path = Path('build.log')
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if build_log_path.is_file():
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with open(build_log_path, 'r') as fd:
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for line in fd:
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line = json.loads(line)
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handle_command(line, args)
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def clean_out_native_artifacts():
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for root, dirs, files in os.walk('.'):
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for file in files:
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path = Path(root) / file
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if path.suffix in ('.o', '.so', '.a'):
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path.unlink()
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def install_for_distribution(args):
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commands = [
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Path(args.host) / 'bin' / 'python3',
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'setup.py',
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'install',
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'--skip-build',
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'--prefix=install',
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'--old-and-unmanageable'
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]
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try:
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subprocess.check_call(commands)
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except Exception:
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print(f'Warning: {" ".join(commands)} failed with distutils, possibly '
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f'due to the use of distutils that does not support the '
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f'--old-and-unmanageable argument. Re-trying the install '
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f'without this argument.')
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subprocess.check_call(commands[:-1])
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def build_wrap(args):
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build_log_path = Path('build.log')
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if not build_log_path.is_file():
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capture_compile(args)
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clean_out_native_artifacts()
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replay_compile(args)
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install_for_distribution(args)
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def make_parser(parser):
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basename = Path(sys.argv[0]).name
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if basename in symlinks:
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# skip parsing of all arguments
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parser._actions = []
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else:
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parser.description = (
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'Cross compile a Python distutils package. '
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'Run from the root directory of the package\'s source')
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parser.add_argument(
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'--cflags', type=str, nargs='?', default=common.DEFAULTCFLAGS,
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help='Extra compiling flags')
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parser.add_argument(
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'--ldflags', type=str, nargs='?', default=common.DEFAULTLDFLAGS,
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help='Extra linking flags')
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parser.add_argument(
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'--host', type=str, nargs='?', default=common.HOSTPYTHON,
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help='The path to the host Python installation')
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parser.add_argument(
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'--target', type=str, nargs='?', default=common.TARGETPYTHON,
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help='The path to the target Python installation')
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return parser
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def main(args):
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basename = Path(sys.argv[0]).name
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if basename in symlinks:
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collect_args(basename)
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else:
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build_wrap(args)
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if __name__ == '__main__':
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basename = Path(sys.argv[0]).name
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if basename in symlinks:
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main(None)
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else:
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parser = make_parser(argparse.ArgumentParser())
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args = parser.parse_args()
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main(args)
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