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()
46 # Special chicken-and-egg handling of the "--debug=memoizer" flag:
48 # SCons.Memoize contains a metaclass implementation that affects how
49 # the other classes are instantiated. The Memoizer may add shim methods
50 # to classes that have methods that cache computed values in order to
51 # count and report the hits and misses.
53 # If we wait to enable the Memoization until after we've parsed the
54 # command line options normally, it will be too late, because the Memoizer
55 # will have already analyzed the classes that it's Memoizing and decided
56 # to not add the shims. So we use a special-case, up-front check for
57 # the "--debug=memoizer" flag and enable Memoizer before we import any
58 # of the other modules that use it.
60 _args = sys.argv + os.environ.get('SCONSFLAGS', '').split()
61 if "--debug=memoizer" in _args:
65 SCons.Memoize.EnableMemoization()
66 except SCons.Warnings.Warning:
67 # Some warning was thrown (inability to --debug=memoizer on
68 # Python 1.5.2 because it doesn't have metaclasses). Arrange
69 # for it to be displayed or not after warnings are configured.
71 exc_type, exc_value, tb = sys.exc_info()
72 Main.delayed_warnings.append((exc_type, exc_value))
77 import SCons.Environment
86 import SCons.Variables
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 #SConscriptSettableOptions = Main.SConscriptSettableOptions
110 AddOption = Main.AddOption
111 GetOption = Main.GetOption
112 SetOption = Main.SetOption
113 Progress = Main.Progress
114 GetBuildFailures = Main.GetBuildFailures
116 #keep_going_on_error = Main.keep_going_on_error
117 #print_dtree = Main.print_dtree
118 #print_explanations = Main.print_explanations
119 #print_includes = Main.print_includes
120 #print_objects = Main.print_objects
121 #print_time = Main.print_time
122 #print_tree = Main.print_tree
123 #memory_stats = Main.memory_stats
124 #ignore_errors = Main.ignore_errors
125 #sconscript_time = Main.sconscript_time
126 #command_time = Main.command_time
127 #exit_status = Main.exit_status
128 #profiling = Main.profiling
129 #repositories = Main.repositories
133 _SConscript = SConscript
135 call_stack = _SConscript.call_stack
138 Action = SCons.Action.Action
139 AddMethod = SCons.Util.AddMethod
140 AllowSubstExceptions = SCons.Subst.SetAllowableExceptions
141 Builder = SCons.Builder.Builder
142 Configure = _SConscript.Configure
143 Environment = SCons.Environment.Environment
144 #OptParser = SCons.SConsOptions.OptParser
145 FindPathDirs = SCons.Scanner.FindPathDirs
146 Platform = SCons.Platform.Platform
147 Return = _SConscript.Return
148 Scanner = SCons.Scanner.Base
149 Tool = SCons.Tool.Tool
150 WhereIs = SCons.Util.WhereIs
153 BoolVariable = SCons.Variables.BoolVariable
154 EnumVariable = SCons.Variables.EnumVariable
155 ListVariable = SCons.Variables.ListVariable
156 PackageVariable = SCons.Variables.PackageVariable
157 PathVariable = SCons.Variables.PathVariable
159 # Deprecated names that will go away some day.
160 BoolOption = SCons.Options.BoolOption
161 EnumOption = SCons.Options.EnumOption
162 ListOption = SCons.Options.ListOption
163 PackageOption = SCons.Options.PackageOption
164 PathOption = SCons.Options.PathOption
167 Chmod = SCons.Defaults.Chmod
168 Copy = SCons.Defaults.Copy
169 Delete = SCons.Defaults.Delete
170 Mkdir = SCons.Defaults.Mkdir
171 Move = SCons.Defaults.Move
172 Touch = SCons.Defaults.Touch
174 # Pre-made, public scanners.
175 CScanner = SCons.Tool.CScanner
176 DScanner = SCons.Tool.DScanner
177 DirScanner = SCons.Defaults.DirScanner
178 ProgramScanner = SCons.Tool.ProgramScanner
179 SourceFileScanner = SCons.Tool.SourceFileScanner
181 # Functions we might still convert to Environment methods.
182 CScan = SCons.Defaults.CScan
183 DefaultEnvironment = SCons.Defaults.DefaultEnvironment
185 # Other variables we provide.
186 class TargetList(UserList.UserList):
187 def _do_nothing(self, *args, **kw):
189 def _add_Default(self, list):
196 BUILD_TARGETS = TargetList()
197 COMMAND_LINE_TARGETS = []
200 # BUILD_TARGETS can be modified in the SConscript files. If so, we
201 # want to treat the modified BUILD_TARGETS list as if they specified
202 # targets on the command line. To do that, though, we need to know if
203 # BUILD_TARGETS was modified through "official" APIs or by hand. We do
204 # this by updating two lists in parallel, the documented BUILD_TARGETS
205 # list, above, and this internal _build_plus_default targets list which
206 # should only have "official" API changes. Then Script/Main.py can
207 # compare these two afterwards to figure out if the user added their
208 # own targets to BUILD_TARGETS.
209 _build_plus_default = TargetList()
211 def _Add_Arguments(alist):
213 a, b = arg.split('=', 1)
215 ARGLIST.append((a, b))
217 def _Add_Targets(tlist):
219 COMMAND_LINE_TARGETS.extend(tlist)
220 BUILD_TARGETS.extend(tlist)
221 BUILD_TARGETS._add_Default = BUILD_TARGETS._do_nothing
222 BUILD_TARGETS._clear = BUILD_TARGETS._do_nothing
223 _build_plus_default.extend(tlist)
224 _build_plus_default._add_Default = _build_plus_default._do_nothing
225 _build_plus_default._clear = _build_plus_default._do_nothing
227 def _Set_Default_Targets_Has_Been_Called(d, fs):
228 return DEFAULT_TARGETS
230 def _Set_Default_Targets_Has_Not_Been_Called(d, fs):
235 _Get_Default_Targets = _Set_Default_Targets_Has_Not_Been_Called
237 def _Set_Default_Targets(env, tlist):
238 global DEFAULT_TARGETS
239 global _Get_Default_Targets
240 _Get_Default_Targets = _Set_Default_Targets_Has_Been_Called
243 # Delete the elements from the list in-place, don't
244 # reassign an empty list to DEFAULT_TARGETS, so that the
245 # variables will still point to the same object we point to.
246 del DEFAULT_TARGETS[:]
247 BUILD_TARGETS._clear()
248 _build_plus_default._clear()
249 elif isinstance(t, SCons.Node.Node):
250 DEFAULT_TARGETS.append(t)
251 BUILD_TARGETS._add_Default([t])
252 _build_plus_default._add_Default([t])
254 nodes = env.arg2nodes(t, env.fs.Entry)
255 DEFAULT_TARGETS.extend(nodes)
256 BUILD_TARGETS._add_Default(nodes)
257 _build_plus_default._add_Default(nodes)
262 def HelpFunction(text):
264 if SCons.Script.help_text is None:
265 SCons.Script.help_text = text
267 help_text = help_text + text
270 # Will be non-zero if we are reading an SConscript file.
271 sconscript_reading = 0
274 def Variables(files=[], args=ARGUMENTS):
275 return SCons.Variables.Variables(files, args)
277 def Options(files=[], args=ARGUMENTS):
278 return SCons.Options.Options(files, args)
280 # The list of global functions to add to the SConscript name space
281 # that end up calling corresponding methods or Builders in the
282 # DefaultEnvironment().
283 GlobalDefaultEnvironmentFunctions = [
284 # Methods from the SConsEnvironment class, above.
286 'EnsurePythonVersion',
287 'EnsureSConsVersion',
293 #'SConscript', is handled separately, below.
296 # Methods from the Environment.Base class.
304 #The Command() method is handled separately, below.
314 'FindInstalledFiles',
339 GlobalDefaultBuilders = [
340 # Supported builders.
367 for name in GlobalDefaultEnvironmentFunctions + GlobalDefaultBuilders:
368 exec "%s = _SConscript.DefaultEnvironmentCall(%s)" % (name, repr(name))
371 # There are a handful of variables that used to live in the
372 # Script/SConscript.py module that some SConscript files out there were
373 # accessing directly as SCons.Script.SConscript.*. The problem is that
374 # "SConscript" in this namespace is no longer a module, it's a global
375 # function call--or more precisely, an object that implements a global
376 # function call through the default Environment. Nevertheless, we can
377 # maintain backwards compatibility for SConscripts that were reaching in
378 # this way by hanging some attributes off the "SConscript" object here.
379 SConscript = _SConscript.DefaultEnvironmentCall('SConscript')
381 # Make SConscript look enough like the module it used to be so
382 # that pychecker doesn't barf.
383 SConscript.__name__ = 'SConscript'
385 SConscript.Arguments = ARGUMENTS
386 SConscript.ArgList = ARGLIST
387 SConscript.BuildTargets = BUILD_TARGETS
388 SConscript.CommandLineTargets = COMMAND_LINE_TARGETS
389 SConscript.DefaultTargets = DEFAULT_TARGETS
391 # The global Command() function must be handled differently than the
392 # global functions for other construction environment methods because
393 # we want people to be able to use Actions that must expand $TARGET
394 # and $SOURCE later, when (and if) the Action is invoked to build
395 # the target(s). We do this with the subst=1 argument, which creates
396 # a DefaultEnvironmentCall instance that wraps up a normal default
397 # construction environment that performs variable substitution, not a
398 # proxy that doesn't.
400 # There's a flaw here, though, because any other $-variables on a command
401 # line will *also* be expanded, each to a null string, but that should
402 # only be a problem in the unusual case where someone was passing a '$'
403 # on a command line and *expected* the $ to get through to the shell
404 # because they were calling Command() and not env.Command()... This is
405 # unlikely enough that we're going to leave this as is and cross that
406 # bridge if someone actually comes to it.
407 Command = _SConscript.DefaultEnvironmentCall('Command', subst=1)
411 # indent-tabs-mode:nil
413 # vim: set expandtab tabstop=4 shiftwidth=4: