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359 lines
12 KiB
Python
359 lines
12 KiB
Python
"""distutils.command.config
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Implements the Distutils 'config' command, a (mostly) empty command class
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that exists mainly to be sub-classed by specific module distributions and
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applications. The idea is that while every "config" command is different,
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at least they're all named the same, and users always see "config" in the
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list of standard commands. Also, this is a good place to put common
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configure-like tasks: "try to compile this C code", or "figure out where
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this header file lives".
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"""
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from __future__ import annotations
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import os
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import pathlib
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import re
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from collections.abc import Sequence
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from distutils._log import log
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from ..ccompiler import CCompiler, CompileError, LinkError, new_compiler
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from ..core import Command
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from ..errors import DistutilsExecError
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from ..sysconfig import customize_compiler
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LANG_EXT = {"c": ".c", "c++": ".cxx"}
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class config(Command):
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description = "prepare to build"
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user_options = [
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('compiler=', None, "specify the compiler type"),
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('cc=', None, "specify the compiler executable"),
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('include-dirs=', 'I', "list of directories to search for header files"),
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('define=', 'D', "C preprocessor macros to define"),
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('undef=', 'U', "C preprocessor macros to undefine"),
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('libraries=', 'l', "external C libraries to link with"),
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('library-dirs=', 'L', "directories to search for external C libraries"),
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('noisy', None, "show every action (compile, link, run, ...) taken"),
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(
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'dump-source',
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None,
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"dump generated source files before attempting to compile them",
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),
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]
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# The three standard command methods: since the "config" command
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# does nothing by default, these are empty.
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def initialize_options(self):
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self.compiler = None
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self.cc = None
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self.include_dirs = None
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self.libraries = None
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self.library_dirs = None
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# maximal output for now
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self.noisy = 1
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self.dump_source = 1
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# list of temporary files generated along-the-way that we have
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# to clean at some point
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self.temp_files = []
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def finalize_options(self):
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if self.include_dirs is None:
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self.include_dirs = self.distribution.include_dirs or []
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elif isinstance(self.include_dirs, str):
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self.include_dirs = self.include_dirs.split(os.pathsep)
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if self.libraries is None:
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self.libraries = []
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elif isinstance(self.libraries, str):
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self.libraries = [self.libraries]
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if self.library_dirs is None:
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self.library_dirs = []
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elif isinstance(self.library_dirs, str):
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self.library_dirs = self.library_dirs.split(os.pathsep)
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def run(self):
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pass
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# Utility methods for actual "config" commands. The interfaces are
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# loosely based on Autoconf macros of similar names. Sub-classes
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# may use these freely.
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def _check_compiler(self):
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"""Check that 'self.compiler' really is a CCompiler object;
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if not, make it one.
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"""
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if not isinstance(self.compiler, CCompiler):
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self.compiler = new_compiler(
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compiler=self.compiler, dry_run=self.dry_run, force=True
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)
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customize_compiler(self.compiler)
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if self.include_dirs:
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self.compiler.set_include_dirs(self.include_dirs)
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if self.libraries:
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self.compiler.set_libraries(self.libraries)
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if self.library_dirs:
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self.compiler.set_library_dirs(self.library_dirs)
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def _gen_temp_sourcefile(self, body, headers, lang):
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filename = "_configtest" + LANG_EXT[lang]
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with open(filename, "w", encoding='utf-8') as file:
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if headers:
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for header in headers:
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file.write(f"#include <{header}>\n")
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file.write("\n")
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file.write(body)
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if body[-1] != "\n":
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file.write("\n")
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return filename
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def _preprocess(self, body, headers, include_dirs, lang):
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src = self._gen_temp_sourcefile(body, headers, lang)
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out = "_configtest.i"
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self.temp_files.extend([src, out])
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self.compiler.preprocess(src, out, include_dirs=include_dirs)
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return (src, out)
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def _compile(self, body, headers, include_dirs, lang):
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src = self._gen_temp_sourcefile(body, headers, lang)
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if self.dump_source:
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dump_file(src, f"compiling '{src}':")
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(obj,) = self.compiler.object_filenames([src])
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self.temp_files.extend([src, obj])
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self.compiler.compile([src], include_dirs=include_dirs)
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return (src, obj)
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def _link(self, body, headers, include_dirs, libraries, library_dirs, lang):
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(src, obj) = self._compile(body, headers, include_dirs, lang)
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prog = os.path.splitext(os.path.basename(src))[0]
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self.compiler.link_executable(
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[obj],
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prog,
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libraries=libraries,
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library_dirs=library_dirs,
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target_lang=lang,
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)
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if self.compiler.exe_extension is not None:
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prog = prog + self.compiler.exe_extension
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self.temp_files.append(prog)
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return (src, obj, prog)
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def _clean(self, *filenames):
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if not filenames:
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filenames = self.temp_files
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self.temp_files = []
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log.info("removing: %s", ' '.join(filenames))
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for filename in filenames:
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try:
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os.remove(filename)
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except OSError:
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pass
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# XXX these ignore the dry-run flag: what to do, what to do? even if
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# you want a dry-run build, you still need some sort of configuration
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# info. My inclination is to make it up to the real config command to
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# consult 'dry_run', and assume a default (minimal) configuration if
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# true. The problem with trying to do it here is that you'd have to
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# return either true or false from all the 'try' methods, neither of
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# which is correct.
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# XXX need access to the header search path and maybe default macros.
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def try_cpp(self, body=None, headers=None, include_dirs=None, lang="c"):
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"""Construct a source file from 'body' (a string containing lines
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of C/C++ code) and 'headers' (a list of header files to include)
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and run it through the preprocessor. Return true if the
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preprocessor succeeded, false if there were any errors.
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('body' probably isn't of much use, but what the heck.)
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"""
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self._check_compiler()
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ok = True
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try:
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self._preprocess(body, headers, include_dirs, lang)
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except CompileError:
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ok = False
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self._clean()
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return ok
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def search_cpp(self, pattern, body=None, headers=None, include_dirs=None, lang="c"):
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"""Construct a source file (just like 'try_cpp()'), run it through
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the preprocessor, and return true if any line of the output matches
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'pattern'. 'pattern' should either be a compiled regex object or a
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string containing a regex. If both 'body' and 'headers' are None,
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preprocesses an empty file -- which can be useful to determine the
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symbols the preprocessor and compiler set by default.
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"""
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self._check_compiler()
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src, out = self._preprocess(body, headers, include_dirs, lang)
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if isinstance(pattern, str):
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pattern = re.compile(pattern)
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with open(out, encoding='utf-8') as file:
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match = any(pattern.search(line) for line in file)
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self._clean()
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return match
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def try_compile(self, body, headers=None, include_dirs=None, lang="c"):
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"""Try to compile a source file built from 'body' and 'headers'.
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Return true on success, false otherwise.
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"""
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self._check_compiler()
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try:
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self._compile(body, headers, include_dirs, lang)
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ok = True
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except CompileError:
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ok = False
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log.info(ok and "success!" or "failure.")
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self._clean()
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return ok
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def try_link(
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self,
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body,
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headers=None,
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include_dirs=None,
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libraries=None,
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library_dirs=None,
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lang="c",
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):
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"""Try to compile and link a source file, built from 'body' and
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'headers', to executable form. Return true on success, false
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otherwise.
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"""
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self._check_compiler()
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try:
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self._link(body, headers, include_dirs, libraries, library_dirs, lang)
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ok = True
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except (CompileError, LinkError):
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ok = False
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log.info(ok and "success!" or "failure.")
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self._clean()
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return ok
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def try_run(
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self,
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body,
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headers=None,
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include_dirs=None,
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libraries=None,
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library_dirs=None,
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lang="c",
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):
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"""Try to compile, link to an executable, and run a program
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built from 'body' and 'headers'. Return true on success, false
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otherwise.
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"""
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self._check_compiler()
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try:
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src, obj, exe = self._link(
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body, headers, include_dirs, libraries, library_dirs, lang
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)
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self.spawn([exe])
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ok = True
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except (CompileError, LinkError, DistutilsExecError):
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ok = False
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log.info(ok and "success!" or "failure.")
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self._clean()
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return ok
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# -- High-level methods --------------------------------------------
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# (these are the ones that are actually likely to be useful
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# when implementing a real-world config command!)
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def check_func(
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self,
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func,
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headers=None,
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include_dirs=None,
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libraries=None,
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library_dirs=None,
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decl=False,
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call=False,
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):
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"""Determine if function 'func' is available by constructing a
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source file that refers to 'func', and compiles and links it.
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If everything succeeds, returns true; otherwise returns false.
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The constructed source file starts out by including the header
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files listed in 'headers'. If 'decl' is true, it then declares
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'func' (as "int func()"); you probably shouldn't supply 'headers'
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and set 'decl' true in the same call, or you might get errors about
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a conflicting declarations for 'func'. Finally, the constructed
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'main()' function either references 'func' or (if 'call' is true)
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calls it. 'libraries' and 'library_dirs' are used when
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linking.
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"""
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self._check_compiler()
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body = []
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if decl:
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body.append(f"int {func} ();")
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body.append("int main () {")
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if call:
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body.append(f" {func}();")
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else:
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body.append(f" {func};")
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body.append("}")
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body = "\n".join(body) + "\n"
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return self.try_link(body, headers, include_dirs, libraries, library_dirs)
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def check_lib(
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self,
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library,
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library_dirs=None,
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headers=None,
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include_dirs=None,
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other_libraries: Sequence[str] = [],
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):
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"""Determine if 'library' is available to be linked against,
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without actually checking that any particular symbols are provided
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by it. 'headers' will be used in constructing the source file to
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be compiled, but the only effect of this is to check if all the
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header files listed are available. Any libraries listed in
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'other_libraries' will be included in the link, in case 'library'
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has symbols that depend on other libraries.
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"""
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self._check_compiler()
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return self.try_link(
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"int main (void) { }",
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headers,
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include_dirs,
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[library] + list(other_libraries),
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library_dirs,
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)
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def check_header(self, header, include_dirs=None, library_dirs=None, lang="c"):
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"""Determine if the system header file named by 'header_file'
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exists and can be found by the preprocessor; return true if so,
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false otherwise.
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"""
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return self.try_cpp(
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body="/* No body */", headers=[header], include_dirs=include_dirs
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)
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def dump_file(filename, head=None):
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"""Dumps a file content into log.info.
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If head is not None, will be dumped before the file content.
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"""
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if head is None:
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log.info('%s', filename)
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else:
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log.info(head)
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log.info(pathlib.Path(filename).read_text(encoding='utf-8'))
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