Source code for SCons.Defaults

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# Copyright The SCons Foundation
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"""Builders and other things for the local site.

Here's where we'll duplicate the functionality of autoconf until we
move it into the installation procedure or use something like qmconf.

The code that reads the registry to find MSVC components was borrowed
from distutils.msvccompiler.
"""

import os
import shutil
import stat
import sys
import time
from typing import List

import SCons.Action
import SCons.Builder
import SCons.CacheDir
import SCons.Environment
import SCons.Errors
import SCons.PathList
import SCons.Scanner.Dir
import SCons.Subst
import SCons.Tool
from SCons.Util import is_List, is_String, is_Sequence, is_Tuple, is_Dict, flatten

# A placeholder for a default Environment (for fetching source files
# from source code management systems and the like).  This must be
# initialized later, after the top-level directory is set by the calling
# interface.
_default_env = None


# Lazily instantiate the default environment so the overhead of creating
# it doesn't apply when it's not needed.
[docs]def _fetch_DefaultEnvironment(*args, **kw): """Returns the already-created default construction environment.""" global _default_env return _default_env
[docs]def DefaultEnvironment(*args, **kw): """ Initial public entry point for creating the default construction Environment. After creating the environment, we overwrite our name (DefaultEnvironment) with the _fetch_DefaultEnvironment() function, which more efficiently returns the initialized default construction environment without checking for its existence. (This function still exists with its _default_check because someone else (*cough* Script/__init__.py *cough*) may keep a reference to this function. So we can't use the fully functional idiom of having the name originally be a something that *only* creates the construction environment and then overwrites the name.) """ global _default_env if not _default_env: _default_env = SCons.Environment.Environment(*args, **kw) _default_env.Decider('content') global DefaultEnvironment DefaultEnvironment = _fetch_DefaultEnvironment _default_env._CacheDir_path = None return _default_env
# Emitters for setting the shared attribute on object files, # and an action for checking that all of the source files # going into a shared library are, in fact, shared.
[docs]def StaticObjectEmitter(target, source, env): for tgt in target: tgt.attributes.shared = None return target, source
[docs]def SharedObjectEmitter(target, source, env): for tgt in target: tgt.attributes.shared = 1 return target, source
[docs]def SharedFlagChecker(source, target, env): same = env.subst('$STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME') if same == '0' or same == '' or same == 'False': for src in source: try: shared = src.attributes.shared except AttributeError: shared = None if not shared: raise SCons.Errors.UserError( "Source file: %s is static and is not compatible with shared target: %s" % (src, target[0]))
SharedCheck = SCons.Action.Action(SharedFlagChecker, None) # Some people were using these variable name before we made # SourceFileScanner part of the public interface. Don't break their # SConscript files until we've given them some fair warning and a # transition period. CScan = SCons.Tool.CScanner DScan = SCons.Tool.DScanner LaTeXScan = SCons.Tool.LaTeXScanner ObjSourceScan = SCons.Tool.SourceFileScanner ProgScan = SCons.Tool.ProgramScanner # These aren't really tool scanners, so they don't quite belong with # the rest of those in Tool/__init__.py, but I'm not sure where else # they should go. Leave them here for now. DirScanner = SCons.Scanner.Dir.DirScanner() DirEntryScanner = SCons.Scanner.Dir.DirEntryScanner() # Actions for common languages. CAction = SCons.Action.Action("$CCCOM", "$CCCOMSTR") ShCAction = SCons.Action.Action("$SHCCCOM", "$SHCCCOMSTR") CXXAction = SCons.Action.Action("$CXXCOM", "$CXXCOMSTR") ShCXXAction = SCons.Action.Action("$SHCXXCOM", "$SHCXXCOMSTR") DAction = SCons.Action.Action("$DCOM", "$DCOMSTR") ShDAction = SCons.Action.Action("$SHDCOM", "$SHDCOMSTR") ASAction = SCons.Action.Action("$ASCOM", "$ASCOMSTR") ASPPAction = SCons.Action.Action("$ASPPCOM", "$ASPPCOMSTR") LinkAction = SCons.Action.Action("$LINKCOM", "$LINKCOMSTR") ShLinkAction = SCons.Action.Action("$SHLINKCOM", "$SHLINKCOMSTR") LdModuleLinkAction = SCons.Action.Action("$LDMODULECOM", "$LDMODULECOMSTR") # Common tasks that we allow users to perform in platform-independent # ways by creating ActionFactory instances. ActionFactory = SCons.Action.ActionFactory
[docs]def get_paths_str(dest) -> str: """Generates a string from *dest* for use in a strfunction. If *dest* is a list, manually converts each elem to a string. """ def quote(arg): return f'"{arg}"' if is_List(dest): elem_strs = [quote(d) for d in dest] return f'[{", ".join(elem_strs)}]' else: return quote(dest)
permission_dic = { 'u': { 'r': stat.S_IRUSR, 'w': stat.S_IWUSR, 'x': stat.S_IXUSR }, 'g': { 'r': stat.S_IRGRP, 'w': stat.S_IWGRP, 'x': stat.S_IXGRP }, 'o': { 'r': stat.S_IROTH, 'w': stat.S_IWOTH, 'x': stat.S_IXOTH } }
[docs]def chmod_func(dest, mode) -> None: """Implementation of the Chmod action function. *mode* can be either an integer (normally expressed in octal mode, as in 0o755) or a string following the syntax of the POSIX chmod command (for example "ugo+w"). The latter must be converted, since the underlying Python only takes the numeric form. """ from string import digits SCons.Node.FS.invalidate_node_memos(dest) if not is_List(dest): dest = [dest] if is_String(mode) and 0 not in [i in digits for i in mode]: mode = int(mode, 8) if not is_String(mode): for element in dest: os.chmod(str(element), mode) else: mode = str(mode) for operation in mode.split(","): if "=" in operation: operator = "=" elif "+" in operation: operator = "+" elif "-" in operation: operator = "-" else: raise SyntaxError("Could not find +, - or =") operation_list = operation.split(operator) if len(operation_list) != 2: raise SyntaxError("More than one operator found") user = operation_list[0].strip().replace("a", "ugo") permission = operation_list[1].strip() new_perm = 0 for u in user: for p in permission: try: new_perm = new_perm | permission_dic[u][p] except KeyError: raise SyntaxError("Unrecognized user or permission format") for element in dest: curr_perm = os.stat(str(element)).st_mode if operator == "=": os.chmod(str(element), new_perm) elif operator == "+": os.chmod(str(element), curr_perm | new_perm) elif operator == "-": os.chmod(str(element), curr_perm & ~new_perm)
[docs]def chmod_strfunc(dest, mode) -> str: """strfunction for the Chmod action function.""" if not is_String(mode): return f'Chmod({get_paths_str(dest)}, {mode:#o})' else: return f'Chmod({get_paths_str(dest)}, "{mode}")'
Chmod = ActionFactory(chmod_func, chmod_strfunc)
[docs]def copy_func(dest, src, symlinks=True) -> int: """Implementation of the Copy action function. Copies *src* to *dest*. If *src* is a list, *dest* must be a directory, or not exist (will be created). Since Python :mod:`shutil` methods, which know nothing about SCons Nodes, will be called to perform the actual copying, args are converted to strings first. If *symlinks* evaluates true, then a symbolic link will be shallow copied and recreated as a symbolic link; otherwise, copying a symbolic link will be equivalent to copying the symbolic link's final target regardless of symbolic link depth. """ dest = str(dest) src = [str(n) for n in src] if is_List(src) else str(src) SCons.Node.FS.invalidate_node_memos(dest) if is_List(src): # this fails only if dest exists and is not a dir try: os.makedirs(dest, exist_ok=True) except FileExistsError: raise SCons.Errors.BuildError( errstr=( 'Error: Copy() called with a list of sources, ' 'which requires target to be a directory, ' f'but "{dest}" is not a directory.' ) ) for file in src: shutil.copy2(file, dest) return 0 elif os.path.islink(src): if symlinks: os.symlink(os.readlink(src), dest) return 0 return copy_func(dest, os.path.realpath(src)) elif os.path.isfile(src): shutil.copy2(src, dest) return 0 else: shutil.copytree(src, dest, symlinks) return 0
[docs]def copy_strfunc(dest, src, symlinks=True) -> str: """strfunction for the Copy action function.""" return f'Copy({get_paths_str(dest)}, {get_paths_str(src)})'
Copy = ActionFactory(copy_func, copy_strfunc)
[docs]def delete_func(dest, must_exist=False) -> None: """Implementation of the Delete action function. Lets the Python :func:`os.unlink` raise an error if *dest* does not exist, unless *must_exist* evaluates false (the default). """ SCons.Node.FS.invalidate_node_memos(dest) if not is_List(dest): dest = [dest] for entry in dest: entry = str(entry) # os.path.exists returns False with broken links that exist entry_exists = os.path.exists(entry) or os.path.islink(entry) if not entry_exists and not must_exist: continue # os.path.isdir returns True when entry is a link to a dir if os.path.isdir(entry) and not os.path.islink(entry): shutil.rmtree(entry, True) continue os.unlink(entry)
[docs]def delete_strfunc(dest, must_exist=False) -> str: """strfunction for the Delete action function.""" return f'Delete({get_paths_str(dest)})'
Delete = ActionFactory(delete_func, delete_strfunc)
[docs]def mkdir_func(dest) -> None: """Implementation of the Mkdir action function.""" SCons.Node.FS.invalidate_node_memos(dest) if not is_List(dest): dest = [dest] for entry in dest: os.makedirs(str(entry), exist_ok=True)
Mkdir = ActionFactory(mkdir_func, lambda _dir: f'Mkdir({get_paths_str(_dir)})')
[docs]def move_func(dest, src) -> None: """Implementation of the Move action function.""" SCons.Node.FS.invalidate_node_memos(dest) SCons.Node.FS.invalidate_node_memos(src) shutil.move(src, dest)
Move = ActionFactory( move_func, lambda dest, src: f'Move("{dest}", "{src}")', convert=str )
[docs]def touch_func(dest) -> None: """Implementation of the Touch action function.""" SCons.Node.FS.invalidate_node_memos(dest) if not is_List(dest): dest = [dest] for file in dest: file = str(file) mtime = int(time.time()) if os.path.exists(file): atime = os.path.getatime(file) else: with open(file, 'w'): atime = mtime os.utime(file, (atime, mtime))
Touch = ActionFactory(touch_func, lambda file: f'Touch({get_paths_str(file)})') # Internal utility functions # pylint: disable-msg=too-many-arguments
[docs]def _concat(prefix, items_iter, suffix, env, f=lambda x: x, target=None, source=None, affect_signature=True): """ Creates a new list from 'items_iter' by first interpolating each element in the list using the 'env' dictionary and then calling f on the list, and finally calling _concat_ixes to concatenate 'prefix' and 'suffix' onto each element of the list. """ if not items_iter: return items_iter l = f(SCons.PathList.PathList(items_iter).subst_path(env, target, source)) if l is not None: items_iter = l if not affect_signature: value = ['$('] else: value = [] value += _concat_ixes(prefix, items_iter, suffix, env) if not affect_signature: value += ["$)"] return value
# pylint: enable-msg=too-many-arguments
[docs]def _concat_ixes(prefix, items_iter, suffix, env): """ Creates a new list from 'items_iter' by concatenating the 'prefix' and 'suffix' arguments onto each element of the list. A trailing space on 'prefix' or leading space on 'suffix' will cause them to be put into separate list elements rather than being concatenated. """ result = [] # ensure that prefix and suffix are strings prefix = str(env.subst(prefix, SCons.Subst.SUBST_RAW)) suffix = str(env.subst(suffix, SCons.Subst.SUBST_RAW)) for x in flatten(items_iter): if isinstance(x, SCons.Node.FS.File): result.append(x) continue x = str(x) if x: if prefix: if prefix[-1] == ' ': result.append(prefix[:-1]) elif x[:len(prefix)] != prefix: x = prefix + x result.append(x) if suffix: if suffix[0] == ' ': result.append(suffix[1:]) elif x[-len(suffix):] != suffix: result[-1] = result[-1] + suffix return result
[docs]def _stripixes(prefix, itms, suffix, stripprefixes, stripsuffixes, env, c=None): """ This is a wrapper around _concat()/_concat_ixes() that checks for the existence of prefixes or suffixes on list items and strips them where it finds them. This is used by tools (like the GNU linker) that need to turn something like 'libfoo.a' into '-lfoo'. """ if not itms: return itms if not callable(c): env_c = env['_concat'] if env_c != _concat and callable(env_c): # There's a custom _concat() method in the construction # environment, and we've allowed people to set that in # the past (see test/custom-concat.py), so preserve the # backwards compatibility. c = env_c else: c = _concat_ixes stripprefixes = list(map(env.subst, flatten(stripprefixes))) stripsuffixes = list(map(env.subst, flatten(stripsuffixes))) stripped = [] for l in SCons.PathList.PathList(itms).subst_path(env, None, None): if isinstance(l, SCons.Node.FS.File): stripped.append(l) continue if not is_String(l): l = str(l) for stripprefix in stripprefixes: lsp = len(stripprefix) if l[:lsp] == stripprefix: l = l[lsp:] # Do not strip more than one prefix break for stripsuffix in stripsuffixes: lss = len(stripsuffix) if l[-lss:] == stripsuffix: l = l[:-lss] # Do not strip more than one suffix break stripped.append(l) return c(prefix, stripped, suffix, env)
[docs]def processDefines(defs) -> List[str]: """Return list of strings for preprocessor defines from *defs*. Resolves the different forms ``CPPDEFINES`` can be assembled in: if the Append/Prepend routines are used beyond a initial setting it will be a deque, but if written to only once (Environment initializer, or direct write) it can be a multitude of types. Any prefix/suffix is handled elsewhere (usually :func:`_concat_ixes`). .. versionchanged:: 4.5.0 Bare tuples are now treated the same as tuple-in-sequence, assumed to describe a valued macro. Bare strings are now split on space. A dictionary is no longer sorted before handling. """ dlist = [] if is_List(defs): for define in defs: if define is None: continue elif is_Sequence(define): if len(define) > 2: raise SCons.Errors.UserError( f"Invalid tuple in CPPDEFINES: {define!r}, " "must be a tuple with only two elements" ) name, *value = define if value and value[0] is not None: # TODO: do we need to quote value if it contains space? dlist.append(f"{name}={value[0]}") else: dlist.append(str(define[0])) elif is_Dict(define): for macro, value in define.items(): if value is not None: # TODO: do we need to quote value if it contains space? dlist.append(f"{macro}={value}") else: dlist.append(str(macro)) elif is_String(define): dlist.append(str(define)) else: raise SCons.Errors.UserError( f"CPPDEFINES entry {define!r} is not a tuple, list, " "dict, string or None." ) elif is_Tuple(defs): if len(defs) > 2: raise SCons.Errors.UserError( f"Invalid tuple in CPPDEFINES: {defs!r}, " "must be a tuple with only two elements" ) name, *value = defs if value and value[0] is not None: # TODO: do we need to quote value if it contains space? dlist.append(f"{name}={value[0]}") else: dlist.append(str(define[0])) elif is_Dict(defs): for macro, value in defs.items(): if value is None: dlist.append(str(macro)) else: dlist.append(f"{macro}={value}") elif is_String(defs): return defs.split() else: dlist.append(str(defs)) return dlist
[docs]def _defines(prefix, defs, suffix, env, target=None, source=None, c=_concat_ixes): """A wrapper around :func:`_concat_ixes` that turns a list or string into a list of C preprocessor command-line definitions. """ return c(prefix, env.subst_list(processDefines(defs), target=target, source=source), suffix, env)
[docs]class NullCmdGenerator: """This is a callable class that can be used in place of other command generators if you don't want them to do anything. The __call__ method for this class simply returns the thing you instantiated it with. Example usage: env["DO_NOTHING"] = NullCmdGenerator env["LINKCOM"] = "${DO_NOTHING('$LINK $SOURCES $TARGET')}" """ def __init__(self, cmd): self.cmd = cmd def __call__(self, target, source, env, for_signature=None): return self.cmd
[docs]class Variable_Method_Caller: """A class for finding a construction variable on the stack and calling one of its methods. We use this to support "construction variables" in our string eval()s that actually stand in for methods--specifically, use of "RDirs" in call to _concat that should actually execute the "TARGET.RDirs" method. (We used to support this by creating a little "build dictionary" that mapped RDirs to the method, but this got in the way of Memoizing construction environments, because we had to create new environment objects to hold the variables.) """ def __init__(self, variable, method): self.variable = variable self.method = method def __call__(self, *args, **kw): try: 1 // 0 except ZeroDivisionError: # Don't start iterating with the current stack-frame to # prevent creating reference cycles (f_back is safe). frame = sys.exc_info()[2].tb_frame.f_back variable = self.variable while frame: if variable in frame.f_locals: v = frame.f_locals[variable] if v: method = getattr(v, self.method) return method(*args, **kw) frame = frame.f_back return None
[docs]def __libversionflags(env, version_var, flags_var): """ if version_var is not empty, returns env[flags_var], otherwise returns None :param env: :param version_var: :param flags_var: :return: """ try: if env.subst('$' + version_var): return env[flags_var] except KeyError: pass return None
[docs]def __lib_either_version_flag(env, version_var1, version_var2, flags_var): """ if $version_var1 or $version_var2 is not empty, returns env[flags_var], otherwise returns None :param env: :param version_var1: :param version_var2: :param flags_var: :return: """ try: if env.subst('$' + version_var1) or env.subst('$' + version_var2): return env[flags_var] except KeyError: pass return None
ConstructionEnvironment = { 'BUILDERS': {}, 'SCANNERS': [SCons.Tool.SourceFileScanner], 'CONFIGUREDIR': '#/.sconf_temp', 'CONFIGURELOG': '#/config.log', 'CPPSUFFIXES': SCons.Tool.CSuffixes, 'DSUFFIXES': SCons.Tool.DSuffixes, 'ENV': {}, 'IDLSUFFIXES': SCons.Tool.IDLSuffixes, '_concat': _concat, '_defines': _defines, '_stripixes': _stripixes, '_LIBFLAGS': '${_concat(LIBLINKPREFIX, LIBS, LIBLINKSUFFIX, __env__)}', '_LIBDIRFLAGS': '${_concat(LIBDIRPREFIX, LIBPATH, LIBDIRSUFFIX, __env__, RDirs, TARGET, SOURCE, affect_signature=False)}', '_CPPINCFLAGS': '${_concat(INCPREFIX, CPPPATH, INCSUFFIX, __env__, RDirs, TARGET, SOURCE, affect_signature=False)}', '_CPPDEFFLAGS': '${_defines(CPPDEFPREFIX, CPPDEFINES, CPPDEFSUFFIX, __env__, TARGET, SOURCE)}', '__libversionflags': __libversionflags, '__SHLIBVERSIONFLAGS': '${__libversionflags(__env__,"SHLIBVERSION","_SHLIBVERSIONFLAGS")}', '__LDMODULEVERSIONFLAGS': '${__libversionflags(__env__,"LDMODULEVERSION","_LDMODULEVERSIONFLAGS")}', '__DSHLIBVERSIONFLAGS': '${__libversionflags(__env__,"DSHLIBVERSION","_DSHLIBVERSIONFLAGS")}', '__lib_either_version_flag': __lib_either_version_flag, 'TEMPFILE': NullCmdGenerator, 'TEMPFILEARGJOIN': ' ', 'TEMPFILEARGESCFUNC': SCons.Subst.quote_spaces, 'Dir': Variable_Method_Caller('TARGET', 'Dir'), 'Dirs': Variable_Method_Caller('TARGET', 'Dirs'), 'File': Variable_Method_Caller('TARGET', 'File'), 'RDirs': Variable_Method_Caller('TARGET', 'RDirs'), } # Local Variables: # tab-width:4 # indent-tabs-mode:nil # End: # vim: set expandtab tabstop=4 shiftwidth=4: