2 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
6 """Main setup for software construction toolkit.
8 This module is a SCons tool which should be include in all environments.
10 env = Environment(tools = ['component_setup'])
11 and should be the first tool from this toolkit referenced by any environment.
20 #------------------------------------------------------------------------------
23 def InstallUsingLink(target, source, env):
24 """Install function for environment which uses link in preference to copy.
27 target: Destintion filename
28 source: Source filename
32 Return code from SCons Node link function.
35 # Use link function for Install() and InstallAs(), since it's much much
36 # faster than copying. This is ok for the way we build clients, where we're
37 # installing to a build output directory and not to a permanent location such
39 # Need to force the target and source to be lists of nodes
40 return SCons.Node.FS.LinkFunc([env.Entry(target)], [env.Entry(source)], env)
43 def PreEvaluateVariables(env):
44 """Deferred function to pre-evaluate SCons varables for each build mode.
47 env: Environment for the current build mode.
49 # Convert directory variables to strings. Must use .abspath not str(), since
50 # otherwise $OBJ_ROOT is converted to a relative path, which evaluates
51 # improperly in SConscripts not in $MAIN_DIR.
52 for var in env.SubstList2('$PRE_EVALUATE_DIRS'):
53 env[var] = env.Dir('$' + var).abspath
56 #------------------------------------------------------------------------------
60 # NOTE: SCons requires the use of this name, which fails gpylint.
61 """SCons entry point for this tool."""
63 # Use MD5 to tell when files differ, if the timestamps differ. This is
64 # better than pure MD5 (since if the timestamps are the same, we don't need
65 # to rescan the file), and also better than pure timestamp (since if a file
66 # is rebuilt to the same contents, we don't need to trigger the build steps
67 # which depend on it).
68 env.Decider('MD5-timestamp')
70 # For duplication order, use hard links then fall back to copying. Don't use
71 # soft links, since those won't do the right thing if the output directory
72 # is tar'd up and moved elsewhere.
73 SCons.Script.SetOption('duplicate', 'hard-copy')
75 # Remove the alias namespace lookup function from the list which SCons uses
76 # when coercing strings into nodes. This prevents SCons from looking up
77 # aliases in input/output lists if they're not explicitly coerced via
78 # Alias(), and removes a conflict where a program has the same shorthand
79 # alias as the program name itself. This conflict manifests itself as a
80 # python exception if you try to build a program in multiple modes on linux,
82 # hammer --mode=dbg,opt port_test
84 for func in env.lookup_list:
85 if func.im_class != SCons.Node.Alias.AliasNameSpace:
86 new_lookup_list.append(func)
87 env.lookup_list = new_lookup_list
89 # Add command line options
90 SCons.Script.AddOption(
95 help='brief command line output')
96 SCons.Script.AddOption(
100 action='store_false',
101 help='verbose command line output')
103 # Add help for command line options
104 SCons.Script.Help("""\
105 --verbose Print verbose output while building, including
106 the full command lines for all commands.
107 --brief Print brief output while building (the default).
108 This and --verbose are opposites. Use --silent
109 to turn off all output.
112 # Cover part of the environment
114 # Add a reference to our python executable, so subprocesses can find and
116 PYTHON = env.File(sys.executable),
118 # Get the absolute path to the directory containing main.scons (or
119 # SConstruct). This should be used in place of the SCons variable '#',
120 # since '#' is not always replaced (for example, when being used to set
121 # an environment variable).
122 MAIN_DIR = env.Dir('#').abspath,
123 # Supply deprecated SCONSTRUCT_DIR for legacy suport
124 # TODO: remove legacy support once everyone has switched over.
125 SCONSTRUCT_DIR = env.Dir('#').abspath,
127 # Use install function above, which uses links in preference to copying.
128 INSTALL = InstallUsingLink,
131 # Specify defaults for variables where we don't need to force replacement
134 DESTINATION_ROOT='$MAIN_DIR/scons-out$HOST_PLATFORM_SUFFIX',
135 TARGET_ROOT='$DESTINATION_ROOT/$BUILD_TYPE',
136 OBJ_ROOT='$TARGET_ROOT/obj',
137 ARTIFACTS_DIR='$TARGET_ROOT/artifacts',
140 # Add default list of variables we should pre-evaluate for each build mode
141 env.Append(PRE_EVALUATE_DIRS = [
149 # If a host platform was specified on the command line, need to put the SCons
150 # output in its own destination directory.
151 force_host_platform = SCons.Script.GetOption('host_platform')
152 if force_host_platform:
153 env['HOST_PLATFORM_SUFFIX'] = '-' + force_host_platform
155 # Put the .sconsign.dblite file in our destination root directory, so that we
156 # don't pollute the source tree. Use the '_' + sys.platform suffix to prevent
157 # the .sconsign.dblite from being shared between host platforms, even in the
158 # case where the --host_platform option is not used (for instance when the
159 # project has platform suffixes on all the build types).
161 # This will prevent host platforms from mistakenly using each other's
162 # .sconsign databases and will allow two host platform builds to occur in the
163 # same # shared tree simulataneously.
165 # Note that we use sys.platform here rather than HOST_PLATFORM, since we need
166 # different sconsign databases for cygwin vs. win32.
167 sconsign_dir = env.Dir('$DESTINATION_ROOT').abspath
168 sconsign_filename = '$DESTINATION_ROOT/.sconsign_%s' % sys.platform
169 sconsign_file = env.File(sconsign_filename).abspath
170 # SConsignFile() doesn't seem to like it if the destination directory
171 # doesn't already exist, so make sure it exists.
172 # TODO: Remove once SCons has fixed this bug.
173 if not os.path.isdir(sconsign_dir):
174 os.makedirs(sconsign_dir)
175 SCons.Script.SConsignFile(sconsign_file)
177 # Build all by default
178 # TODO: This would be more nicely done by creating an 'all' alias and mapping
179 # that to $DESTINATION_ROOT (or the accumulation of all $TARGET_ROOT's for
180 # the environments which apply to the current host platform). Ideally, that
181 # would be done in site_init.py and not here. But since we can't do that,
182 # just set the default to be DESTINATION_ROOT here. Note that this currently
183 # forces projects which want to override the default to do so after including
184 # the component_setup tool (reasonable, since component_setup should pretty
185 # much be the first thing in a SConstruct.
186 env.Default('$DESTINATION_ROOT')
188 # Use brief command line strings if necessary.
189 # Since these get passed to PRINT_CMD_LINE_FUNC, which scons_to_ninja
190 # relies on, don't do this if generate_ninja is enabled.
191 if (env.GetOption('brief_comstr') and
192 'generate_ninja' not in SCons.Script.ARGUMENTS):
194 ARCOMSTR='________Creating library $TARGET',
195 ASCOMSTR='________Assembling $TARGET',
196 CCCOMSTR='________Compiling $TARGET',
197 CXXCOMSTR='________Compiling $TARGET',
198 LDMODULECOMSTR='________Building loadable module $TARGET',
199 LINKCOMSTR='________Linking $TARGET',
200 MANIFEST_COMSTR='________Updating manifest for $TARGET',
201 MIDLCOMSTR='________Compiling IDL $TARGET',
202 PCHCOMSTR='________Precompiling $TARGET',
203 RANLIBCOMSTR='________Indexing $TARGET',
204 RCCOMSTR='________Compiling resource $TARGET',
205 SHCCCOMSTR='________Compiling $TARGET',
206 SHCXXCOMSTR='________Compiling $TARGET',
207 SHLINKCOMSTR='________Linking $TARGET',
208 SHMANIFEST_COMSTR='________Updating manifest for $TARGET',
209 # Strip doesn't seem to be a first-class citizen in SCons country,
210 # so we have to add these *COM, *COMSTR manually.
211 STRIPCOMSTR='________Stripping to create $TARGET',
212 TRANSLATECOMSTR='________Translating $TARGET',
213 PNACLFINALIZECOMSTR='________Finalizing pexe $TARGET',
216 # Add other default tools from our toolkit
217 # TODO: Currently this needs to be before SOURCE_ROOT in case a tool needs to
218 # redefine it. Need a better way to handle order-dependency in tool setup.
219 for t in component_setup_tools:
222 # The following environment replacements use env.Dir() to force immediate
223 # evaluation/substitution of SCons variables. They can't be part of the
224 # preceding env.Replace() since they they may rely indirectly on variables
225 # defined there, and the env.Dir() calls would be evaluated before the
228 # Set default SOURCE_ROOT if there is none, assuming we're in a local
229 # site_scons directory for the project.
230 source_root_relative = os.path.normpath(
231 os.path.join(os.path.dirname(__file__), '../..'))
232 source_root = env.get('SOURCE_ROOT', source_root_relative)
233 env['SOURCE_ROOT'] = env.Dir(source_root).abspath
235 usage_log.log.SetParam('component_setup.project_path',
236 env.RelativePath('$SOURCE_ROOT', '$MAIN_DIR'))
238 # Make tool root separate from source root so it can be overridden when we
239 # have a common location for tools outside of the current clientspec. Need
240 # to check if it's defined already, so it can be set prior to this tool
242 tool_root = env.get('TOOL_ROOT', '$SOURCE_ROOT')
243 env['TOOL_ROOT'] = env.Dir(tool_root).abspath
245 # Defer pre-evaluating some environment variables, but do before building
247 env.Defer(PreEvaluateVariables)
248 env.Defer('BuildEnvironmentSConscripts', after=PreEvaluateVariables)