mirror of
https://github.com/mongodb/mongo.git
synced 2024-12-01 01:21:03 +01:00
214 lines
8.1 KiB
Python
214 lines
8.1 KiB
Python
"""Extension to SCons providing advanced static library dependency tracking.
|
|
|
|
These modifications to a build environment, which can be attached to
|
|
StaticLibrary and Program builders via a call to setup_environment(env),
|
|
cause the build system to track library dependencies through static libraries,
|
|
and to add them to the link command executed when building programs.
|
|
|
|
For example, consider a program 'try' that depends on a lib 'tc', which in
|
|
turn uses a symbol from a lib 'tb' which in turn uses a library from 'ta'.
|
|
Without this package, the Program declaration for "try" looks like this:
|
|
|
|
Program('try', ['try.c', 'path/to/${LIBPREFIX}tc${LIBSUFFIX}',
|
|
'path/to/${LIBPREFIX}tc${LIBSUFFIX}',
|
|
'path/to/${LIBPREFIX}tc${LIBSUFFIX}',])
|
|
|
|
With this library, we can instead write the following
|
|
|
|
Program('try', ['try.c'], LIBDEPS=['path/to/tc'])
|
|
StaticLibrary('tc', ['c.c'], LIBDEPS=['path/to/tb'])
|
|
StaticLibrary('tb', ['b.c'], LIBDEPS=['path/to/ta'])
|
|
StaticLibrary('ta', ['a.c'])
|
|
|
|
And the build system will figure out that it needs to link libta.a and libtb.a
|
|
when building 'try'.
|
|
"""
|
|
|
|
# Copyright (c) 2010, Corensic Inc., All Rights Reserved.
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining
|
|
# a copy of this software and associated documentation files (the
|
|
# "Software"), to deal in the Software without restriction, including
|
|
# without limitation the rights to use, copy, modify, merge, publish,
|
|
# distribute, sublicense, and/or sell copies of the Software, and to
|
|
# permit persons to whom the Software is furnished to do so, subject to
|
|
# the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included
|
|
# in all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
|
|
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
|
|
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
import os
|
|
|
|
import SCons.Errors
|
|
import SCons.Scanner
|
|
import SCons.Util
|
|
|
|
class DependencyCycleError(SCons.Errors.UserError):
|
|
"""Exception representing a cycle discovered in library dependencies."""
|
|
|
|
def __init__(self, first_node ):
|
|
super(DependencyCycleError, self).__init__()
|
|
self.cycle_nodes = [first_node]
|
|
|
|
def __str__(self):
|
|
return " => ".join(str(n) for n in self.cycle_nodes)
|
|
|
|
def __get_libdeps(node, env_var):
|
|
"""Given a SCons Node, return its library dependencies.
|
|
|
|
Computes the dependencies if they're not already cached.
|
|
"""
|
|
|
|
cached_var_name = env_var + '_cached'
|
|
|
|
if not hasattr(node.attributes, cached_var_name):
|
|
setattr(node.attributes, cached_var_name, __compute_libdeps(node, env_var))
|
|
return getattr(node.attributes, cached_var_name)
|
|
|
|
def __compute_libdeps(node, env_var):
|
|
"""Recursively identify all library dependencies for a node."""
|
|
|
|
if getattr(node.attributes, 'libdeps_exploring', False):
|
|
raise DependencyCycleError(node)
|
|
|
|
env = node.get_env()
|
|
deps = set()
|
|
node.attributes.libdeps_exploring = True
|
|
try:
|
|
try:
|
|
for child in env.Flatten(env.get(env_var, [])):
|
|
if not child:
|
|
continue
|
|
deps.add(child)
|
|
deps.update(__get_libdeps(child, env_var))
|
|
|
|
except DependencyCycleError, e:
|
|
if len(e.cycle_nodes) == 1 or e.cycle_nodes[0] != e.cycle_nodes[-1]:
|
|
e.cycle_nodes.append(node)
|
|
raise
|
|
finally:
|
|
node.attributes.libdeps_exploring = False
|
|
|
|
return deps
|
|
|
|
def update_scanner(builder):
|
|
"""Update the scanner for "builder" to also scan library dependencies."""
|
|
|
|
old_scanner = builder.target_scanner
|
|
|
|
if old_scanner:
|
|
path_function = old_scanner.path_function
|
|
def new_scanner(node, env, path=()):
|
|
result = set(old_scanner.function(node, env, path))
|
|
result.update(__get_libdeps(node, 'LIBDEPS'))
|
|
result.update(__get_libdeps(node, 'SYSLIBDEPS'))
|
|
return sorted(result)
|
|
else:
|
|
path_function = None
|
|
def new_scanner(node, env, path=()):
|
|
result = set(__get_libdeps(node, 'LIBDEPS'))
|
|
result.update(__get_libdeps(node, 'SYSLIBDEPS'))
|
|
return sorted(result)
|
|
|
|
builder.target_scanner = SCons.Scanner.Scanner(function=new_scanner,
|
|
path_function=path_function)
|
|
|
|
def get_libdeps(source, target, env, for_signature):
|
|
"""Implementation of the special _LIBDEPS environment variable.
|
|
|
|
Expands to the library dependencies for a target.
|
|
"""
|
|
|
|
if for_signature:
|
|
return []
|
|
target = env.Flatten([target])
|
|
return list(__get_libdeps(target[0], 'LIBDEPS'))
|
|
|
|
def get_libdeps_objs(source, target, env, for_signature):
|
|
objs = set()
|
|
for lib in get_libdeps(source, target, env, for_signature):
|
|
objs.update(lib.sources_set)
|
|
return list(objs)
|
|
|
|
def get_libdeps_special_sun(source, target, env, for_signature):
|
|
x = get_libdeps(source, target, env, for_signature )
|
|
return x + x + x
|
|
|
|
def get_syslibdeps(source, target, env, for_signature):
|
|
if for_signature:
|
|
return[]
|
|
deps = list(__get_libdeps(target[0], 'SYSLIBDEPS'))
|
|
return deps
|
|
|
|
def libdeps_emitter(target, source, env):
|
|
"""SCons emitter that takes values from the LIBDEPS environment variable and
|
|
converts them to File node objects, binding correct path information into
|
|
those File objects.
|
|
|
|
Emitters run on a particular "target" node during the initial execution of
|
|
the SConscript file, rather than during the later build phase. When they
|
|
run, the "env" environment's working directory information is what you
|
|
expect it to be -- that is, the working directory is considered to be the
|
|
one that contains the SConscript file. This allows specification of
|
|
relative paths to LIBDEPS elements.
|
|
|
|
This emitter also adds LIBSUFFIX and LIBPREFIX appropriately.
|
|
"""
|
|
|
|
libdep_files = []
|
|
lib_suffix = env.subst('$LIBSUFFIX', target=target, source=source)
|
|
lib_prefix = env.subst('$LIBPREFIX', target=target, source=source)
|
|
for dep in env.Flatten([env.get('LIBDEPS', [])]):
|
|
full_path = env.subst(str(dep), target=target, source=source)
|
|
dir_name = os.path.dirname(full_path)
|
|
file_name = os.path.basename(full_path)
|
|
if not file_name.startswith(lib_prefix):
|
|
file_name = '${LIBPREFIX}' + file_name
|
|
if not file_name.endswith(lib_suffix):
|
|
file_name += '${LIBSUFFIX}'
|
|
libdep_files.append(env.File(os.path.join(dir_name, file_name)))
|
|
|
|
env['LIBDEPS'] = libdep_files
|
|
|
|
return target, source
|
|
|
|
def setup_environment(env):
|
|
"""Set up the given build environment to do LIBDEPS tracking."""
|
|
|
|
try:
|
|
env['_LIBDEPS']
|
|
except KeyError:
|
|
env['_LIBDEPS'] = '$_LIBDEPS_LIBS'
|
|
|
|
# TODO: remove this
|
|
# this is a horrible horrible hack for
|
|
# for 32-bit solaris
|
|
if "uname" in dir(os) and os.uname()[1] == "sun32b":
|
|
env['_LIBDEPS_LIBS'] = get_libdeps_special_sun
|
|
else:
|
|
env['_LIBDEPS_LIBS'] = get_libdeps
|
|
|
|
env['_LIBDEPS_OBJS'] = get_libdeps_objs
|
|
env['_SYSLIBDEPS'] = ' ${_stripixes(LIBLINKPREFIX, SYSLIBDEPS, LIBLINKSUFFIX, LIBPREFIXES, LIBSUFFIXES, __env__)} '
|
|
env['_SHLIBDEPS'] = '$SHLIBDEP_GROUP_START ${_concat(SHLIBDEPPREFIX, __env__.subst(_LIBDEPS, target=TARGET, source=SOURCE), SHLIBDEPSUFFIX, __env__, target=TARGET, source=SOURCE)} $SHLIBDEP_GROUP_END'
|
|
|
|
env['LIBDEPS'] = SCons.Util.CLVar()
|
|
env['SYSLIBDEPS'] = SCons.Util.CLVar()
|
|
env.Append(LIBEMITTER=libdeps_emitter,
|
|
PROGEMITTER=libdeps_emitter,
|
|
SHLIBEMITTER=libdeps_emitter)
|
|
env.Prepend(_LIBFLAGS=' $LINK_LIBGROUP_START $_LIBDEPS $LINK_LIBGROUP_END $_SYSLIBDEPS ')
|
|
for builder_name in ('Program', 'SharedLibrary', 'LoadableModule'):
|
|
try:
|
|
update_scanner(env['BUILDERS'][builder_name])
|
|
except KeyError:
|
|
pass
|