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Diffstat (limited to 'engine/SCons/SConf.py')
| -rw-r--r-- | engine/SCons/SConf.py | 1038 |
1 files changed, 1038 insertions, 0 deletions
diff --git a/engine/SCons/SConf.py b/engine/SCons/SConf.py new file mode 100644 index 0000000..b67ca64 --- /dev/null +++ b/engine/SCons/SConf.py @@ -0,0 +1,1038 @@ +"""SCons.SConf + +Autoconf-like configuration support. +""" + +# +# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation +# +# 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. +# + +__revision__ = "src/engine/SCons/SConf.py 4577 2009/12/27 19:43:56 scons" + +import os +import re +import string +import StringIO +import sys +import traceback +import types + +import SCons.Action +import SCons.Builder +import SCons.Errors +import SCons.Job +import SCons.Node.FS +import SCons.Taskmaster +import SCons.Util +import SCons.Warnings +import SCons.Conftest + +from SCons.Debug import Trace + +# Turn off the Conftest error logging +SCons.Conftest.LogInputFiles = 0 +SCons.Conftest.LogErrorMessages = 0 + +# Set +build_type = None +build_types = ['clean', 'help'] + +def SetBuildType(type): + global build_type + build_type = type + +# to be set, if we are in dry-run mode +dryrun = 0 + +AUTO=0 # use SCons dependency scanning for up-to-date checks +FORCE=1 # force all tests to be rebuilt +CACHE=2 # force all tests to be taken from cache (raise an error, if necessary) +cache_mode = AUTO + +def SetCacheMode(mode): + """Set the Configure cache mode. mode must be one of "auto", "force", + or "cache".""" + global cache_mode + if mode == "auto": + cache_mode = AUTO + elif mode == "force": + cache_mode = FORCE + elif mode == "cache": + cache_mode = CACHE + else: + raise ValueError, "SCons.SConf.SetCacheMode: Unknown mode " + mode + +progress_display = SCons.Util.display # will be overwritten by SCons.Script +def SetProgressDisplay(display): + """Set the progress display to use (called from SCons.Script)""" + global progress_display + progress_display = display + +SConfFS = None + +_ac_build_counter = 0 # incremented, whenever TryBuild is called +_ac_config_logs = {} # all config.log files created in this build +_ac_config_hs = {} # all config.h files created in this build +sconf_global = None # current sconf object + +def _createConfigH(target, source, env): + t = open(str(target[0]), "w") + defname = re.sub('[^A-Za-z0-9_]', '_', string.upper(str(target[0]))) + t.write("""#ifndef %(DEFNAME)s_SEEN +#define %(DEFNAME)s_SEEN + +""" % {'DEFNAME' : defname}) + t.write(source[0].get_contents()) + t.write(""" +#endif /* %(DEFNAME)s_SEEN */ +""" % {'DEFNAME' : defname}) + t.close() + +def _stringConfigH(target, source, env): + return "scons: Configure: creating " + str(target[0]) + +def CreateConfigHBuilder(env): + """Called just before the building targets phase begins.""" + if len(_ac_config_hs) == 0: + return + action = SCons.Action.Action(_createConfigH, + _stringConfigH) + sconfigHBld = SCons.Builder.Builder(action=action) + env.Append( BUILDERS={'SConfigHBuilder':sconfigHBld} ) + for k in _ac_config_hs.keys(): + env.SConfigHBuilder(k, env.Value(_ac_config_hs[k])) + +class SConfWarning(SCons.Warnings.Warning): + pass +SCons.Warnings.enableWarningClass(SConfWarning) + +# some error definitions +class SConfError(SCons.Errors.UserError): + def __init__(self,msg): + SCons.Errors.UserError.__init__(self,msg) + +class ConfigureDryRunError(SConfError): + """Raised when a file or directory needs to be updated during a Configure + process, but the user requested a dry-run""" + def __init__(self,target): + if not isinstance(target, SCons.Node.FS.File): + msg = 'Cannot create configure directory "%s" within a dry-run.' % str(target) + else: + msg = 'Cannot update configure test "%s" within a dry-run.' % str(target) + SConfError.__init__(self,msg) + +class ConfigureCacheError(SConfError): + """Raised when a use explicitely requested the cache feature, but the test + is run the first time.""" + def __init__(self,target): + SConfError.__init__(self, '"%s" is not yet built and cache is forced.' % str(target)) + +# define actions for building text files +def _createSource( target, source, env ): + fd = open(str(target[0]), "w") + fd.write(source[0].get_contents()) + fd.close() +def _stringSource( target, source, env ): + return (str(target[0]) + ' <-\n |' + + string.replace( source[0].get_contents(), + '\n', "\n |" ) ) + +# python 2.2 introduces types.BooleanType +BooleanTypes = [types.IntType] +if hasattr(types, 'BooleanType'): BooleanTypes.append(types.BooleanType) + +class SConfBuildInfo(SCons.Node.FS.FileBuildInfo): + """ + Special build info for targets of configure tests. Additional members + are result (did the builder succeed last time?) and string, which + contains messages of the original build phase. + """ + result = None # -> 0/None -> no error, != 0 error + string = None # the stdout / stderr output when building the target + + def set_build_result(self, result, string): + self.result = result + self.string = string + + +class Streamer: + """ + 'Sniffer' for a file-like writable object. Similar to the unix tool tee. + """ + def __init__(self, orig): + self.orig = orig + self.s = StringIO.StringIO() + + def write(self, str): + if self.orig: + self.orig.write(str) + self.s.write(str) + + def writelines(self, lines): + for l in lines: + self.write(l + '\n') + + def getvalue(self): + """ + Return everything written to orig since the Streamer was created. + """ + return self.s.getvalue() + + def flush(self): + if self.orig: + self.orig.flush() + self.s.flush() + + +class SConfBuildTask(SCons.Taskmaster.AlwaysTask): + """ + This is almost the same as SCons.Script.BuildTask. Handles SConfErrors + correctly and knows about the current cache_mode. + """ + def display(self, message): + if sconf_global.logstream: + sconf_global.logstream.write("scons: Configure: " + message + "\n") + + def display_cached_string(self, bi): + """ + Logs the original builder messages, given the SConfBuildInfo instance + bi. + """ + if not isinstance(bi, SConfBuildInfo): + SCons.Warnings.warn(SConfWarning, + "The stored build information has an unexpected class: %s" % bi.__class__) + else: + self.display("The original builder output was:\n" + + string.replace(" |" + str(bi.string), + "\n", "\n |")) + + def failed(self): + # check, if the reason was a ConfigureDryRunError or a + # ConfigureCacheError and if yes, reraise the exception + exc_type = self.exc_info()[0] + if issubclass(exc_type, SConfError): + raise + elif issubclass(exc_type, SCons.Errors.BuildError): + # we ignore Build Errors (occurs, when a test doesn't pass) + # Clear the exception to prevent the contained traceback + # to build a reference cycle. + self.exc_clear() + else: + self.display('Caught exception while building "%s":\n' % + self.targets[0]) + try: + excepthook = sys.excepthook + except AttributeError: + # Earlier versions of Python don't have sys.excepthook... + def excepthook(type, value, tb): + traceback.print_tb(tb) + print type, value + apply(excepthook, self.exc_info()) + return SCons.Taskmaster.Task.failed(self) + + def collect_node_states(self): + # returns (is_up_to_date, cached_error, cachable) + # where is_up_to_date is 1, if the node(s) are up_to_date + # cached_error is 1, if the node(s) are up_to_date, but the + # build will fail + # cachable is 0, if some nodes are not in our cache + T = 0 + changed = False + cached_error = False + cachable = True + for t in self.targets: + if T: Trace('%s' % (t)) + bi = t.get_stored_info().binfo + if isinstance(bi, SConfBuildInfo): + if T: Trace(': SConfBuildInfo') + if cache_mode == CACHE: + t.set_state(SCons.Node.up_to_date) + if T: Trace(': set_state(up_to-date)') + else: + if T: Trace(': get_state() %s' % t.get_state()) + if T: Trace(': changed() %s' % t.changed()) + if (t.get_state() != SCons.Node.up_to_date and t.changed()): + changed = True + if T: Trace(': changed %s' % changed) + cached_error = cached_error or bi.result + else: + if T: Trace(': else') + # the node hasn't been built in a SConf context or doesn't + # exist + cachable = False + changed = ( t.get_state() != SCons.Node.up_to_date ) + if T: Trace(': changed %s' % changed) + if T: Trace('\n') + return (not changed, cached_error, cachable) + + def execute(self): + if not self.targets[0].has_builder(): + return + + sconf = sconf_global + + is_up_to_date, cached_error, cachable = self.collect_node_states() + + if cache_mode == CACHE and not cachable: + raise ConfigureCacheError(self.targets[0]) + elif cache_mode == FORCE: + is_up_to_date = 0 + + if cached_error and is_up_to_date: + self.display("Building \"%s\" failed in a previous run and all " + "its sources are up to date." % str(self.targets[0])) + binfo = self.targets[0].get_stored_info().binfo + self.display_cached_string(binfo) + raise SCons.Errors.BuildError # will be 'caught' in self.failed + elif is_up_to_date: + self.display("\"%s\" is up to date." % str(self.targets[0])) + binfo = self.targets[0].get_stored_info().binfo + self.display_cached_string(binfo) + elif dryrun: + raise ConfigureDryRunError(self.targets[0]) + else: + # note stdout and stderr are the same here + s = sys.stdout = sys.stderr = Streamer(sys.stdout) + try: + env = self.targets[0].get_build_env() + if cache_mode == FORCE: + # Set up the Decider() to force rebuilds by saying + # that every source has changed. Note that we still + # call the environment's underlying source decider so + # that the correct .sconsign info will get calculated + # and keep the build state consistent. + def force_build(dependency, target, prev_ni, + env_decider=env.decide_source): + env_decider(dependency, target, prev_ni) + return True + if env.decide_source.func_code is not force_build.func_code: + env.Decider(force_build) + env['PSTDOUT'] = env['PSTDERR'] = s + try: + sconf.cached = 0 + self.targets[0].build() + finally: + sys.stdout = sys.stderr = env['PSTDOUT'] = \ + env['PSTDERR'] = sconf.logstream + except KeyboardInterrupt: + raise + except SystemExit: + exc_value = sys.exc_info()[1] + raise SCons.Errors.ExplicitExit(self.targets[0],exc_value.code) + except Exception, e: + for t in self.targets: + binfo = t.get_binfo() + binfo.__class__ = SConfBuildInfo + binfo.set_build_result(1, s.getvalue()) + sconsign_entry = SCons.SConsign.SConsignEntry() + sconsign_entry.binfo = binfo + #sconsign_entry.ninfo = self.get_ninfo() + # We'd like to do this as follows: + # t.store_info(binfo) + # However, we need to store it as an SConfBuildInfo + # object, and store_info() will turn it into a + # regular FileNodeInfo if the target is itself a + # regular File. + sconsign = t.dir.sconsign() + sconsign.set_entry(t.name, sconsign_entry) + sconsign.merge() + raise e + else: + for t in self.targets: + binfo = t.get_binfo() + binfo.__class__ = SConfBuildInfo + binfo.set_build_result(0, s.getvalue()) + sconsign_entry = SCons.SConsign.SConsignEntry() + sconsign_entry.binfo = binfo + #sconsign_entry.ninfo = self.get_ninfo() + # We'd like to do this as follows: + # t.store_info(binfo) + # However, we need to store it as an SConfBuildInfo + # object, and store_info() will turn it into a + # regular FileNodeInfo if the target is itself a + # regular File. + sconsign = t.dir.sconsign() + sconsign.set_entry(t.name, sconsign_entry) + sconsign.merge() + +class SConfBase: + """This is simply a class to represent a configure context. After + creating a SConf object, you can call any tests. After finished with your + tests, be sure to call the Finish() method, which returns the modified + environment. + Some words about caching: In most cases, it is not necessary to cache + Test results explicitely. Instead, we use the scons dependency checking + mechanism. For example, if one wants to compile a test program + (SConf.TryLink), the compiler is only called, if the program dependencies + have changed. However, if the program could not be compiled in a former + SConf run, we need to explicitely cache this error. + """ + + def __init__(self, env, custom_tests = {}, conf_dir='$CONFIGUREDIR', + log_file='$CONFIGURELOG', config_h = None, _depth = 0): + """Constructor. Pass additional tests in the custom_tests-dictinary, + e.g. custom_tests={'CheckPrivate':MyPrivateTest}, where MyPrivateTest + defines a custom test. + Note also the conf_dir and log_file arguments (you may want to + build tests in the VariantDir, not in the SourceDir) + """ + global SConfFS + if not SConfFS: + SConfFS = SCons.Node.FS.default_fs or \ + SCons.Node.FS.FS(env.fs.pathTop) + if sconf_global is not None: + raise (SCons.Errors.UserError, + "Only one SConf object may be active at one time") + self.env = env + if log_file is not None: + log_file = SConfFS.File(env.subst(log_file)) + self.logfile = log_file + self.logstream = None + self.lastTarget = None + self.depth = _depth + self.cached = 0 # will be set, if all test results are cached + + # add default tests + default_tests = { + 'CheckCC' : CheckCC, + 'CheckCXX' : CheckCXX, + 'CheckSHCC' : CheckSHCC, + 'CheckSHCXX' : CheckSHCXX, + 'CheckFunc' : CheckFunc, + 'CheckType' : CheckType, + 'CheckTypeSize' : CheckTypeSize, + 'CheckDeclaration' : CheckDeclaration, + 'CheckHeader' : CheckHeader, + 'CheckCHeader' : CheckCHeader, + 'CheckCXXHeader' : CheckCXXHeader, + 'CheckLib' : CheckLib, + 'CheckLibWithHeader' : CheckLibWithHeader, + } + self.AddTests(default_tests) + self.AddTests(custom_tests) + self.confdir = SConfFS.Dir(env.subst(conf_dir)) + if config_h is not None: + config_h = SConfFS.File(config_h) + self.config_h = config_h + self._startup() + + def Finish(self): + """Call this method after finished with your tests: + env = sconf.Finish() + """ + self._shutdown() + return self.env + + def Define(self, name, value = None, comment = None): + """ + Define a pre processor symbol name, with the optional given value in the + current config header. + + If value is None (default), then #define name is written. If value is not + none, then #define name value is written. + + comment is a string which will be put as a C comment in the + header, to explain the meaning of the value (appropriate C comments /* and + */ will be put automatically.""" + lines = [] + if comment: + comment_str = "/* %s */" % comment + lines.append(comment_str) + + if value is not None: + define_str = "#define %s %s" % (name, value) + else: + define_str = "#define %s" % name + lines.append(define_str) + lines.append('') + + self.config_h_text = self.config_h_text + string.join(lines, '\n') + + def BuildNodes(self, nodes): + """ + Tries to build the given nodes immediately. Returns 1 on success, + 0 on error. + """ + if self.logstream is not None: + # override stdout / stderr to write in log file + oldStdout = sys.stdout + sys.stdout = self.logstream + oldStderr = sys.stderr + sys.stderr = self.logstream + + # the engine assumes the current path is the SConstruct directory ... + old_fs_dir = SConfFS.getcwd() + old_os_dir = os.getcwd() + SConfFS.chdir(SConfFS.Top, change_os_dir=1) + + # Because we take responsibility here for writing out our + # own .sconsign info (see SConfBuildTask.execute(), above), + # we override the store_info() method with a null place-holder + # so we really control how it gets written. + for n in nodes: + n.store_info = n.do_not_store_info + + ret = 1 + + try: + # ToDo: use user options for calc + save_max_drift = SConfFS.get_max_drift() + SConfFS.set_max_drift(0) + tm = SCons.Taskmaster.Taskmaster(nodes, SConfBuildTask) + # we don't want to build tests in parallel + jobs = SCons.Job.Jobs(1, tm ) + jobs.run() + for n in nodes: + state = n.get_state() + if (state != SCons.Node.executed and + state != SCons.Node.up_to_date): + # the node could not be built. we return 0 in this case + ret = 0 + finally: + SConfFS.set_max_drift(save_max_drift) + os.chdir(old_os_dir) + SConfFS.chdir(old_fs_dir, change_os_dir=0) + if self.logstream is not None: + # restore stdout / stderr + sys.stdout = oldStdout + sys.stderr = oldStderr + return ret + + def pspawn_wrapper(self, sh, escape, cmd, args, env): + """Wrapper function for handling piped spawns. + + This looks to the calling interface (in Action.py) like a "normal" + spawn, but associates the call with the PSPAWN variable from + the construction environment and with the streams to which we + want the output logged. This gets slid into the construction + environment as the SPAWN variable so Action.py doesn't have to + know or care whether it's spawning a piped command or not. + """ + return self.pspawn(sh, escape, cmd, args, env, self.logstream, self.logstream) + + + def TryBuild(self, builder, text = None, extension = ""): + """Low level TryBuild implementation. Normally you don't need to + call that - you can use TryCompile / TryLink / TryRun instead + """ + global _ac_build_counter + + # Make sure we have a PSPAWN value, and save the current + # SPAWN value. + try: + self.pspawn = self.env['PSPAWN'] + except KeyError: + raise SCons.Errors.UserError('Missing PSPAWN construction variable.') + try: + save_spawn = self.env['SPAWN'] + except KeyError: + raise SCons.Errors.UserError('Missing SPAWN construction variable.') + + nodesToBeBuilt = [] + + f = "conftest_" + str(_ac_build_counter) + pref = self.env.subst( builder.builder.prefix ) + suff = self.env.subst( builder.builder.suffix ) + target = self.confdir.File(pref + f + suff) + + try: + # Slide our wrapper into the construction environment as + # the SPAWN function. + self.env['SPAWN'] = self.pspawn_wrapper + sourcetext = self.env.Value(text) + + if text is not None: + textFile = self.confdir.File(f + extension) + textFileNode = self.env.SConfSourceBuilder(target=textFile, + source=sourcetext) + nodesToBeBuilt.extend(textFileNode) + source = textFileNode + else: + source = None + + nodes = builder(target = target, source = source) + if not SCons.Util.is_List(nodes): + nodes = [nodes] + nodesToBeBuilt.extend(nodes) + result = self.BuildNodes(nodesToBeBuilt) + + finally: + self.env['SPAWN'] = save_spawn + + _ac_build_counter = _ac_build_counter + 1 + if result: + self.lastTarget = nodes[0] + else: + self.lastTarget = None + + return result + + def TryAction(self, action, text = None, extension = ""): + """Tries to execute the given action with optional source file + contents <text> and optional source file extension <extension>, + Returns the status (0 : failed, 1 : ok) and the contents of the + output file. + """ + builder = SCons.Builder.Builder(action=action) + self.env.Append( BUILDERS = {'SConfActionBuilder' : builder} ) + ok = self.TryBuild(self.env.SConfActionBuilder, text, extension) + del self.env['BUILDERS']['SConfActionBuilder'] + if ok: + outputStr = self.lastTarget.get_contents() + return (1, outputStr) + return (0, "") + + def TryCompile( self, text, extension): + """Compiles the program given in text to an env.Object, using extension + as file extension (e.g. '.c'). Returns 1, if compilation was + successful, 0 otherwise. The target is saved in self.lastTarget (for + further processing). + """ + return self.TryBuild(self.env.Object, text, extension) + + def TryLink( self, text, extension ): + """Compiles the program given in text to an executable env.Program, + using extension as file extension (e.g. '.c'). Returns 1, if + compilation was successful, 0 otherwise. The target is saved in + self.lastTarget (for further processing). + """ + return self.TryBuild(self.env.Program, text, extension ) + + def TryRun(self, text, extension ): + """Compiles and runs the program given in text, using extension + as file extension (e.g. '.c'). Returns (1, outputStr) on success, + (0, '') otherwise. The target (a file containing the program's stdout) + is saved in self.lastTarget (for further processing). + """ + ok = self.TryLink(text, extension) + if( ok ): + prog = self.lastTarget + pname = prog.path + output = self.confdir.File(os.path.basename(pname)+'.out') + node = self.env.Command(output, prog, [ [ pname, ">", "${TARGET}"] ]) + ok = self.BuildNodes(node) + if ok: + outputStr = output.get_contents() + return( 1, outputStr) + return (0, "") + + class TestWrapper: + """A wrapper around Tests (to ensure sanity)""" + def __init__(self, test, sconf): + self.test = test + self.sconf = sconf + def __call__(self, *args, **kw): + if not self.sconf.active: + raise (SCons.Errors.UserError, + "Test called after sconf.Finish()") + context = CheckContext(self.sconf) + ret = apply(self.test, (context,) + args, kw) + if self.sconf.config_h is not None: + self.sconf.config_h_text = self.sconf.config_h_text + context.config_h + context.Result("error: no result") + return ret + + def AddTest(self, test_name, test_instance): + """Adds test_class to this SConf instance. It can be called with + self.test_name(...)""" + setattr(self, test_name, SConfBase.TestWrapper(test_instance, self)) + + def AddTests(self, tests): + """Adds all the tests given in the tests dictionary to this SConf + instance + """ + for name in tests.keys(): + self.AddTest(name, tests[name]) + + def _createDir( self, node ): + dirName = str(node) + if dryrun: + if not os.path.isdir( dirName ): + raise ConfigureDryRunError(dirName) + else: + if not os.path.isdir( dirName ): + os.makedirs( dirName ) + node._exists = 1 + + def _startup(self): + """Private method. Set up logstream, and set the environment + variables necessary for a piped build + """ + global _ac_config_logs + global sconf_global + global SConfFS + + self.lastEnvFs = self.env.fs + self.env.fs = SConfFS + self._createDir(self.confdir) + self.confdir.up().add_ignore( [self.confdir] ) + + if self.logfile is not None and not dryrun: + # truncate logfile, if SConf.Configure is called for the first time + # in a build + if _ac_config_logs.has_key(self.logfile): + log_mode = "a" + else: + _ac_config_logs[self.logfile] = None + log_mode = "w" + fp = open(str(self.logfile), log_mode) + self.logstream = SCons.Util.Unbuffered(fp) + # logfile may stay in a build directory, so we tell + # the build system not to override it with a eventually + # existing file with the same name in the source directory + self.logfile.dir.add_ignore( [self.logfile] ) + + tb = traceback.extract_stack()[-3-self.depth] + old_fs_dir = SConfFS.getcwd() + SConfFS.chdir(SConfFS.Top, change_os_dir=0) + self.logstream.write('file %s,line %d:\n\tConfigure(confdir = %s)\n' % + (tb[0], tb[1], str(self.confdir)) ) + SConfFS.chdir(old_fs_dir) + else: + self.logstream = None + # we use a special builder to create source files from TEXT + action = SCons.Action.Action(_createSource, + _stringSource) + sconfSrcBld = SCons.Builder.Builder(action=action) + self.env.Append( BUILDERS={'SConfSourceBuilder':sconfSrcBld} ) + self.config_h_text = _ac_config_hs.get(self.config_h, "") + self.active = 1 + # only one SConf instance should be active at a time ... + sconf_global = self + + def _shutdown(self): + """Private method. Reset to non-piped spawn""" + global sconf_global, _ac_config_hs + + if not self.active: + raise SCons.Errors.UserError, "Finish may be called only once!" + if self.logstream is not None and not dryrun: + self.logstream.write("\n") + self.logstream.close() + self.logstream = None + # remove the SConfSourceBuilder from the environment + blds = self.env['BUILDERS'] + del blds['SConfSourceBuilder'] + self.env.Replace( BUILDERS=blds ) + self.active = 0 + sconf_global = None + if not self.config_h is None: + _ac_config_hs[self.config_h] = self.config_h_text + self.env.fs = self.lastEnvFs + +class CheckContext: + """Provides a context for configure tests. Defines how a test writes to the + screen and log file. + + A typical test is just a callable with an instance of CheckContext as + first argument: + + def CheckCustom(context, ...) + context.Message('Checking my weird test ... ') + ret = myWeirdTestFunction(...) + context.Result(ret) + + Often, myWeirdTestFunction will be one of + context.TryCompile/context.TryLink/context.TryRun. The results of + those are cached, for they are only rebuild, if the dependencies have + changed. + """ + + def __init__(self, sconf): + """Constructor. Pass the corresponding SConf instance.""" + self.sconf = sconf + self.did_show_result = 0 + + # for Conftest.py: + self.vardict = {} + self.havedict = {} + self.headerfilename = None + self.config_h = "" # config_h text will be stored here + # we don't regenerate the config.h file after each test. That means, + # that tests won't be able to include the config.h file, and so + # they can't do an #ifdef HAVE_XXX_H. This shouldn't be a major + # issue, though. If it turns out, that we need to include config.h + # in tests, we must ensure, that the dependencies are worked out + # correctly. Note that we can't use Conftest.py's support for config.h, + # cause we will need to specify a builder for the config.h file ... + + def Message(self, text): + """Inform about what we are doing right now, e.g. + 'Checking for SOMETHING ... ' + """ + self.Display(text) + self.sconf.cached = 1 + self.did_show_result = 0 + + def Result(self, res): + """Inform about the result of the test. res may be an integer or a + string. In case of an integer, the written text will be 'yes' or 'no'. + The result is only displayed when self.did_show_result is not set. + """ + if type(res) in BooleanTypes: + if res: + text = "yes" + else: + text = "no" + elif type(res) == types.StringType: + text = res + else: + raise TypeError, "Expected string, int or bool, got " + str(type(res)) + + if self.did_show_result == 0: + # Didn't show result yet, do it now. + self.Display(text + "\n") + self.did_show_result = 1 + + def TryBuild(self, *args, **kw): + return apply(self.sconf.TryBuild, args, kw) + + def TryAction(self, *args, **kw): + return apply(self.sconf.TryAction, args, kw) + + def TryCompile(self, *args, **kw): + return apply(self.sconf.TryCompile, args, kw) + + def TryLink(self, *args, **kw): + return apply(self.sconf.TryLink, args, kw) + + def TryRun(self, *args, **kw): + return apply(self.sconf.TryRun, args, kw) + + def __getattr__( self, attr ): + if( attr == 'env' ): + return self.sconf.env + elif( attr == 'lastTarget' ): + return self.sconf.lastTarget + else: + raise AttributeError, "CheckContext instance has no attribute '%s'" % attr + + #### Stuff used by Conftest.py (look there for explanations). + + def BuildProg(self, text, ext): + self.sconf.cached = 1 + # TODO: should use self.vardict for $CC, $CPPFLAGS, etc. + return not self.TryBuild(self.env.Program, text, ext) + + def CompileProg(self, text, ext): + self.sconf.cached = 1 + # TODO: should use self.vardict for $CC, $CPPFLAGS, etc. + return not self.TryBuild(self.env.Object, text, ext) + + def CompileSharedObject(self, text, ext): + self.sconf.cached = 1 + # TODO: should use self.vardict for $SHCC, $CPPFLAGS, etc. + return not self.TryBuild(self.env.SharedObject, text, ext) + + def RunProg(self, text, ext): + self.sconf.cached = 1 + # TODO: should use self.vardict for $CC, $CPPFLAGS, etc. + st, out = self.TryRun(text, ext) + return not st, out + + def AppendLIBS(self, lib_name_list): + oldLIBS = self.env.get( 'LIBS', [] ) + self.env.Append(LIBS = lib_name_list) + return oldLIBS + + def PrependLIBS(self, lib_name_list): + oldLIBS = self.env.get( 'LIBS', [] ) + self.env.Prepend(LIBS = lib_name_list) + return oldLIBS + + def SetLIBS(self, val): + oldLIBS = self.env.get( 'LIBS', [] ) + self.env.Replace(LIBS = val) + return oldLIBS + + def Display(self, msg): + if self.sconf.cached: + # We assume that Display is called twice for each test here + # once for the Checking for ... message and once for the result. + # The self.sconf.cached flag can only be set between those calls + msg = "(cached) " + msg + self.sconf.cached = 0 + progress_display(msg, append_newline=0) + self.Log("scons: Configure: " + msg + "\n") + + def Log(self, msg): + if self.sconf.logstream is not None: + self.sconf.logstream.write(msg) + + #### End of stuff used by Conftest.py. + + +def SConf(*args, **kw): + if kw.get(build_type, True): + kw['_depth'] = kw.get('_depth', 0) + 1 + for bt in build_types: + try: + del kw[bt] + except KeyError: + pass + return apply(SConfBase, args, kw) + else: + return SCons.Util.Null() + + +def CheckFunc(context, function_name, header = None, language = None): + res = SCons.Conftest.CheckFunc(context, function_name, header = header, language = language) + context.did_show_result = 1 + return not res + +def CheckType(context, type_name, includes = "", language = None): + res = SCons.Conftest.CheckType(context, type_name, + header = includes, language = language) + context.did_show_result = 1 + return not res + +def CheckTypeSize(context, type_name, includes = "", language = None, expect = None): + res = SCons.Conftest.CheckTypeSize(context, type_name, + header = includes, language = language, + expect = expect) + context.did_show_result = 1 + return res + +def CheckDeclaration(context, declaration, includes = "", language = None): + res = SCons.Conftest.CheckDeclaration(context, declaration, + includes = includes, + language = language) + context.did_show_result = 1 + return not res + +def createIncludesFromHeaders(headers, leaveLast, include_quotes = '""'): + # used by CheckHeader and CheckLibWithHeader to produce C - #include + # statements from the specified header (list) + if not SCons.Util.is_List(headers): + headers = [headers] + l = [] + if leaveLast: + lastHeader = headers[-1] + headers = headers[:-1] + else: + lastHeader = None + for s in headers: + l.append("#include %s%s%s\n" + % (include_quotes[0], s, include_quotes[1])) + return string.join(l, ''), lastHeader + +def CheckHeader(context, header, include_quotes = '<>', language = None): + """ + A test for a C or C++ header file. + """ + prog_prefix, hdr_to_check = \ + createIncludesFromHeaders(header, 1, include_quotes) + res = SCons.Conftest.CheckHeader(context, hdr_to_check, prog_prefix, + language = language, + include_quotes = include_quotes) + context.did_show_result = 1 + return not res + +def CheckCC(context): + res = SCons.Conftest.CheckCC(context) + context.did_show_result = 1 + return not res + +def CheckCXX(context): + res = SCons.Conftest.CheckCXX(context) + context.did_show_result = 1 + return not res + +def CheckSHCC(context): + res = SCons.Conftest.CheckSHCC(context) + context.did_show_result = 1 + return not res + +def CheckSHCXX(context): + res = SCons.Conftest.CheckSHCXX(context) + context.did_show_result = 1 + return not res + +# Bram: Make this function obsolete? CheckHeader() is more generic. + +def CheckCHeader(context, header, include_quotes = '""'): + """ + A test for a C header file. + """ + return CheckHeader(context, header, include_quotes, language = "C") + + +# Bram: Make this function obsolete? CheckHeader() is more generic. + +def CheckCXXHeader(context, header, include_quotes = '""'): + """ + A test for a C++ header file. + """ + return CheckHeader(context, header, include_quotes, language = "C++") + + +def CheckLib(context, library = None, symbol = "main", + header = None, language = None, autoadd = 1): + """ + A test for a library. See also CheckLibWithHeader. + Note that library may also be None to test whether the given symbol + compiles without flags. + """ + + if library == []: + library = [None] + + if not SCons.Util.is_List(library): + library = [library] + + # ToDo: accept path for the library + res = SCons.Conftest.CheckLib(context, library, symbol, header = header, + language = language, autoadd = autoadd) + context.did_show_result = 1 + return not res + +# XXX +# Bram: Can only include one header and can't use #ifdef HAVE_HEADER_H. + +def CheckLibWithHeader(context, libs, header, language, + call = None, autoadd = 1): + # ToDo: accept path for library. Support system header files. + """ + Another (more sophisticated) test for a library. + Checks, if library and header is available for language (may be 'C' + or 'CXX'). Call maybe be a valid expression _with_ a trailing ';'. + As in CheckLib, we support library=None, to test if the call compiles + without extra link flags. + """ + prog_prefix, dummy = \ + createIncludesFromHeaders(header, 0) + if libs == []: + libs = [None] + + if not SCons.Util.is_List(libs): + libs = [libs] + + res = SCons.Conftest.CheckLib(context, libs, None, prog_prefix, + call = call, language = language, autoadd = autoadd) + context.did_show_result = 1 + return not res + +# Local Variables: +# tab-width:4 +# indent-tabs-mode:nil +# End: +# vim: set expandtab tabstop=4 shiftwidth=4: |