3 This file implements the main() function used by the scons script.
5 Architecturally, this *is* the scons script, and will likely only be
6 called from the external "scons" wrapper. Consequently, anything here
7 should not be, or be considered, part of the build engine. If it's
8 something that we expect other software to want to use, it should go in
9 some other module. If it's specific to the "scons" script invocation,
17 # Permission is hereby granted, free of charge, to any person obtaining
18 # a copy of this software and associated documentation files (the
19 # "Software"), to deal in the Software without restriction, including
20 # without limitation the rights to use, copy, modify, merge, publish,
21 # distribute, sublicense, and/or sell copies of the Software, and to
22 # permit persons to whom the Software is furnished to do so, subject to
23 # the following conditions:
25 # The above copyright notice and this permission notice shall be included
26 # in all copies or substantial portions of the Software.
28 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
29 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
30 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
40 start_time = time.time()
47 # Special chicken-and-egg handling of the "--debug=memoizer" flag:
49 # SCons.Memoize contains a metaclass implementation that affects how
50 # the other classes are instantiated. The Memoizer may add shim methods
51 # to classes that have methods that cache computed values in order to
52 # count and report the hits and misses.
54 # If we wait to enable the Memoization until after we've parsed the
55 # command line options normally, it will be too late, because the Memoizer
56 # will have already analyzed the classes that it's Memoizing and decided
57 # to not add the shims. So we use a special-case, up-front check for
58 # the "--debug=memoizer" flag and enable Memoizer before we import any
59 # of the other modules that use it.
61 _args = sys.argv + string.split(os.environ.get('SCONSFLAGS', ''))
62 if "--debug=memoizer" in _args:
66 SCons.Memoize.EnableMemoization()
67 except SCons.Warnings.Warning:
68 # Some warning was thrown (inability to --debug=memoizer on
69 # Python 1.5.2 because it doesn't have metaclasses). Arrange
70 # for it to be displayed or not after warnings are configured.
72 exc_type, exc_value, tb = sys.exc_info()
73 Main.delayed_warnings.append(exc_type, exc_value)
78 import SCons.Environment
93 # The following are global class definitions and variables that used to
94 # live directly in this module back before 0.96.90, when it contained
95 # a lot of code. Some SConscript files in widely-distributed packages
96 # (Blender is the specific example) actually reached into SCons.Script
97 # directly to use some of these. Rather than break those SConscript
98 # files, we're going to propagate these names into the SCons.Script
101 # Some of these are commented out because it's *really* unlikely anyone
102 # used them, but we're going to leave the comment here to try to make
103 # it obvious what to do if the situation arises.
104 BuildTask = Main.BuildTask
105 CleanTask = Main.CleanTask
106 QuestionTask = Main.QuestionTask
107 #PrintHelp = Main.PrintHelp
108 OptParser = Main.OptParser
109 SConscriptSettableOptions = Main.SConscriptSettableOptions
111 keep_going_on_error = Main.keep_going_on_error
112 #print_dtree = Main.print_dtree
113 print_explanations = Main.print_explanations
114 print_includes = Main.print_includes
115 print_objects = Main.print_objects
116 print_time = Main.print_time
117 #print_tree = Main.print_tree
118 memory_stats = Main.memory_stats
119 ignore_errors = Main.ignore_errors
120 #sconscript_time = Main.sconscript_time
121 #command_time = Main.command_time
122 #exit_status = Main.exit_status
123 #profiling = Main.profiling
124 repositories = Main.repositories
128 _SConscript = SConscript
130 call_stack = _SConscript.call_stack
133 Action = SCons.Action.Action
134 AllowSubstExceptions = SCons.Subst.SetAllowableExceptions
135 BoolOption = SCons.Options.BoolOption
136 Builder = SCons.Builder.Builder
137 Configure = _SConscript.Configure
138 EnumOption = SCons.Options.EnumOption
139 Environment = SCons.Environment.Environment
140 FindPathDirs = SCons.Scanner.FindPathDirs
141 ListOption = SCons.Options.ListOption
142 PackageOption = SCons.Options.PackageOption
143 PathOption = SCons.Options.PathOption
144 Platform = SCons.Platform.Platform
145 Return = _SConscript.Return
146 Scanner = SCons.Scanner.Base
147 Tool = SCons.Tool.Tool
148 WhereIs = SCons.Util.WhereIs
151 Chmod = SCons.Defaults.Chmod
152 Copy = SCons.Defaults.Copy
153 Delete = SCons.Defaults.Delete
154 Mkdir = SCons.Defaults.Mkdir
155 Move = SCons.Defaults.Move
156 Touch = SCons.Defaults.Touch
158 # Pre-made, public scanners.
159 CScanner = SCons.Tool.CScanner
160 DScanner = SCons.Tool.DScanner
161 DirScanner = SCons.Defaults.DirScanner
162 ProgramScanner = SCons.Tool.ProgramScanner
163 SourceFileScanner = SCons.Tool.SourceFileScanner
165 # Functions we might still convert to Environment methods.
166 CScan = SCons.Defaults.CScan
167 DefaultEnvironment = SCons.Defaults.DefaultEnvironment
169 # Other variables we provide.
170 class TargetList(UserList.UserList):
171 def _do_nothing(self, *args, **kw):
173 def _add_Default(self, list):
180 BUILD_TARGETS = TargetList()
181 COMMAND_LINE_TARGETS = []
184 # BUILD_TARGETS can be modified in the SConscript files. If so, we
185 # want to treat the modified BUILD_TARGETS list as if they specified
186 # targets on the command line. To do that, though, we need to know if
187 # BUILD_TARGETS was modified through "official" APIs or by hand. We do
188 # this by updating two lists in parallel, the documented BUILD_TARGETS
189 # list, above, and this internal _build_plus_default targets list which
190 # should only have "official" API changes. Then Script/Main.py can
191 # compare these two afterwards to figure out if the user added their
192 # own targets to BUILD_TARGETS.
193 _build_plus_default = TargetList()
195 def _Add_Arguments(alist):
197 a, b = string.split(arg, '=', 1)
199 ARGLIST.append((a, b))
201 def _Add_Targets(tlist):
203 COMMAND_LINE_TARGETS.extend(tlist)
204 BUILD_TARGETS.extend(tlist)
205 BUILD_TARGETS._add_Default = BUILD_TARGETS._do_nothing
206 BUILD_TARGETS._clear = BUILD_TARGETS._do_nothing
207 _build_plus_default.extend(tlist)
208 _build_plus_default._add_Default = _build_plus_default._do_nothing
209 _build_plus_default._clear = _build_plus_default._do_nothing
211 def _Set_Default_Targets_Has_Been_Called(d, fs):
212 return DEFAULT_TARGETS
214 def _Set_Default_Targets_Has_Not_Been_Called(d, fs):
219 _Get_Default_Targets = _Set_Default_Targets_Has_Not_Been_Called
221 def _Set_Default_Targets(env, tlist):
222 global DEFAULT_TARGETS
223 global _Get_Default_Targets
224 _Get_Default_Targets = _Set_Default_Targets_Has_Been_Called
227 # Delete the elements from the list in-place, don't
228 # reassign an empty list to DEFAULT_TARGETS, so that the
229 # variables will still point to the same object we point to.
230 del DEFAULT_TARGETS[:]
231 BUILD_TARGETS._clear()
232 _build_plus_default._clear()
233 elif isinstance(t, SCons.Node.Node):
234 DEFAULT_TARGETS.append(t)
235 BUILD_TARGETS._add_Default([t])
236 _build_plus_default._add_Default([t])
238 nodes = env.arg2nodes(t, env.fs.Entry)
239 DEFAULT_TARGETS.extend(nodes)
240 BUILD_TARGETS._add_Default(nodes)
241 _build_plus_default._add_Default(nodes)
246 def HelpFunction(text):
248 if SCons.Script.help_text is None:
249 SCons.Script.help_text = text
251 help_text = help_text + text
254 # Will be non-zero if we are reading an SConscript file.
255 sconscript_reading = 0
258 def Options(files=None, args=ARGUMENTS):
259 return SCons.Options.Options(files, args)
261 # The list of global functions to add to the SConscript name space
262 # that end up calling corresponding methods or Builders in the
263 # DefaultEnvironment().
264 GlobalDefaultEnvironmentFunctions = [
265 # Methods from the SConsEnvironment class, above.
267 'EnsurePythonVersion',
268 'EnsureSConsVersion',
275 #'SConscript', is handled separately, below.
279 # Methods from the Environment.Base class.
287 #The Command() method is handled separately, below.
315 GlobalDefaultBuilders = [
316 # Supported builders.
342 for name in GlobalDefaultEnvironmentFunctions + GlobalDefaultBuilders:
343 exec "%s = _SConscript.DefaultEnvironmentCall(%s)" % (name, repr(name))
346 # There are a handful of variables that used to live in the
347 # Script/SConscript.py module that some SConscript files out there were
348 # accessing directly as SCons.Script.SConscript.*. The problem is that
349 # "SConscript" in this namespace is no longer a module, it's a global
350 # function call--or more precisely, an object that implements a global
351 # function call through the default Environment. Nevertheless, we can
352 # maintain backwards compatibility for SConscripts that were reaching in
353 # this way by hanging some attributes off the "SConscript" object here.
354 SConscript = _SConscript.DefaultEnvironmentCall('SConscript')
356 # Make SConscript look enough like the module it used to be so
357 # that pychecker doesn't barf.
358 SConscript.__name__ = 'SConscript'
360 SConscript.Arguments = ARGUMENTS
361 SConscript.ArgList = ARGLIST
362 SConscript.BuildTargets = BUILD_TARGETS
363 SConscript.CommandLineTargets = COMMAND_LINE_TARGETS
364 SConscript.DefaultTargets = DEFAULT_TARGETS
366 # The global Command() function must be handled differently than the
367 # global functions for other construction environment methods because
368 # we want people to be able to use Actions that must expand $TARGET
369 # and $SOURCE later, when (and if) the Action is invoked to build
370 # the target(s). We do this with the subst=1 argument, which creates
371 # a DefaultEnvironmentCall instance that wraps up a normal default
372 # construction environment that performs variable substitution, not a
373 # proxy that doesn't.
375 # There's a flaw here, though, because any other $-variables on a command
376 # line will *also* be expanded, each to a null string, but that should
377 # only be a problem in the unusual case where someone was passing a '$'
378 # on a command line and *expected* the $ to get through to the shell
379 # because they were calling Command() and not env.Command()... This is
380 # unlikely enough that we're going to leave this as is and cross that
381 # bridge if someone actually comes to it.
382 Command = _SConscript.DefaultEnvironmentCall('Command', subst=1)