3 SCons platform selection.
5 This looks for modules that define a callable object that can modify a
6 construction environment as appropriate for a given platform.
8 Note that we take a more simplistic view of "platform" than Python does.
9 We're looking for a single string that determines a set of
10 tool-independent variables with which to initialize a construction
11 environment. Consequently, we'll examine both sys.platform and os.name
12 (and anything else that might come in to play) in order to return some
13 specification which is unique enough for our purposes.
15 Note that because this subsysem just *selects* a callable that can
16 modify a construction environment, it's possible for people to define
17 their own "platform specification" in an arbitrary callable function.
18 No one needs to use or tie in to this subsystem in order to roll
19 their own platform definition.
23 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
25 # Permission is hereby granted, free of charge, to any person obtaining
26 # a copy of this software and associated documentation files (the
27 # "Software"), to deal in the Software without restriction, including
28 # without limitation the rights to use, copy, modify, merge, publish,
29 # distribute, sublicense, and/or sell copies of the Software, and to
30 # permit persons to whom the Software is furnished to do so, subject to
31 # the following conditions:
33 # The above copyright notice and this permission notice shall be included
34 # in all copies or substantial portions of the Software.
36 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
37 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
38 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
39 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
40 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
41 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
42 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
45 __revision__ = "src/engine/SCons/Platform/__init__.py 5023 2010/06/14 22:05:46 scons"
58 def platform_default():
59 """Return the platform string for our execution environment.
61 The returned value should map to one of the SCons/Platform/*.py
62 files. Since we're architecture independent, though, we don't
63 care about the machine architecture.
69 if sys.platform == 'cygwin':
71 elif sys.platform.find('irix') != -1:
73 elif sys.platform.find('sunos') != -1:
75 elif sys.platform.find('hp-ux') != -1:
77 elif sys.platform.find('aix') != -1:
79 elif sys.platform.find('darwin') != -1:
83 elif os.name == 'os2':
88 def platform_module(name = platform_default()):
89 """Return the imported module for the platform.
91 This looks for a module name that matches the specified argument.
92 If the name is unspecified, we fetch the appropriate default for
93 our execution environment.
95 full_name = 'SCons.Platform.' + name
96 if full_name not in sys.modules:
101 file, path, desc = imp.find_module(name,
102 sys.modules['SCons.Platform'].__path__)
104 mod = imp.load_module(full_name, file, path, desc)
111 importer = zipimport.zipimporter( sys.modules['SCons.Platform'].__path__[0] )
112 mod = importer.load_module(full_name)
114 raise SCons.Errors.UserError("No platform named '%s'" % name)
115 setattr(SCons.Platform, name, mod)
116 return sys.modules[full_name]
118 def DefaultToolList(platform, env):
119 """Select a default tool list for the specified platform.
121 return SCons.Tool.tool_list(platform, env)
123 class PlatformSpec(object):
124 def __init__(self, name, generate):
126 self.generate = generate
128 def __call__(self, *args, **kw):
129 return self.generate(*args, **kw)
134 class TempFileMunge(object):
135 """A callable class. You can set an Environment variable to this,
136 then call it with a string argument, then it will perform temporary
137 file substitution on it. This is used to circumvent the long command
141 env["TEMPFILE"] = TempFileMunge
142 env["LINKCOM"] = "${TEMPFILE('$LINK $TARGET $SOURCES')}"
144 By default, the name of the temporary file used begins with a
145 prefix of '@'. This may be configred for other tool chains by
146 setting '$TEMPFILEPREFIX'.
148 env["TEMPFILEPREFIX"] = '-@' # diab compiler
149 env["TEMPFILEPREFIX"] = '-via' # arm tool chain
151 def __init__(self, cmd):
154 def __call__(self, target, source, env, for_signature):
156 # If we're being called for signature calculation, it's
157 # because we're being called by the string expansion in
158 # Subst.py, which has the logic to strip any $( $) that
159 # may be in the command line we squirreled away. So we
160 # just return the raw command line and let the upper
161 # string substitution layers do their thing.
164 # Now we're actually being called because someone is actually
165 # going to try to execute the command, so we have to do our
167 cmd = env.subst_list(self.cmd, SCons.Subst.SUBST_CMD, target, source)[0]
169 maxline = int(env.subst('$MAXLINELENGTH'))
176 if length <= maxline:
179 # We do a normpath because mktemp() has what appears to be
180 # a bug in Windows that will use a forward slash as a path
181 # delimiter. Windows's link mistakes that for a command line
184 # We use the .lnk suffix for the benefit of the Phar Lap
185 # linkloc linker, which likes to append an .lnk suffix if
187 (fd, tmp) = tempfile.mkstemp('.lnk', text=True)
188 native_tmp = SCons.Util.get_native_path(os.path.normpath(tmp))
190 if env['SHELL'] and env['SHELL'] == 'sh':
191 # The sh shell will try to escape the backslashes in the
192 # path, so unescape them.
193 native_tmp = native_tmp.replace('\\', r'\\\\')
194 # In Cygwin, we want to use rm to delete the temporary
195 # file, because del does not exist in the sh shell.
196 rm = env.Detect('rm') or 'del'
198 # Don't use 'rm' if the shell is not sh, because rm won't
199 # work with the Windows shells (cmd.exe or command.com) or
200 # Windows path names.
203 prefix = env.subst('$TEMPFILEPREFIX')
207 args = list(map(SCons.Subst.quote_spaces, cmd[1:]))
208 os.write(fd, " ".join(args) + "\n")
210 # XXX Using the SCons.Action.print_actions value directly
211 # like this is bogus, but expedient. This class should
212 # really be rewritten as an Action that defines the
213 # __call__() and strfunction() methods and lets the
214 # normal action-execution logic handle whether or not to
215 # print/execute the action. The problem, though, is all
216 # of that is decided before we execute this method as
217 # part of expanding the $TEMPFILE construction variable.
218 # Consequently, refactoring this will have to wait until
219 # we get more flexible with allowing Actions to exist
220 # independently and get strung together arbitrarily like
221 # Ant tasks. In the meantime, it's going to be more
222 # user-friendly to not let obsession with architectural
223 # purity get in the way of just being helpful, so we'll
224 # reach into SCons.Action directly.
225 if SCons.Action.print_actions:
226 print("Using tempfile "+native_tmp+" for command line:\n"+
227 str(cmd[0]) + " " + " ".join(args))
228 return [ cmd[0], prefix + native_tmp + '\n' + rm, native_tmp ]
230 def Platform(name = platform_default()):
231 """Select a canned Platform specification.
233 module = platform_module(name)
234 spec = PlatformSpec(name, module.generate)
239 # indent-tabs-mode:nil
241 # vim: set expandtab tabstop=4 shiftwidth=4: