[Scons-dev] Patch for potential new debug option

[Bill Deegan]

If I run "scons --debug=dumpenv", won't it still do a build?
So I could get a lot of extra output if I just redirect stdout.

Does the output go to stdout or stderr?

-Bill

On Sat, Aug 8, 2015 at 11:28 AM, William Blevins <wblevins001 at gmail.com>
wrote:

>
> On Aug 8, 2015 1:47 PM, "Jason Kenny" <dragon512 at live.com> wrote:
> >
> > My only concern with this feature is that it can dump a lot of data.
> Given Parts for example I would have lots of environment that would be
> dumped. such information is generally only useful when you can map a given
> environment to the correct file ( or part file in my case) or build actions
> (such as this is the environment for link foo.so or this was the
> environment for making hello.o).
>
> I am mapping a target to its build env and outputting the env data.  Just
> like your example :)
> >
> > Jason
> >
> > From: William Blevins
> > Sent: Saturday, August 8, 2015 12:22 AM
> > To: SCons developer list
> > Subject: [Scons-dev] Patch for potential new debug option
> >
> > Here is a patch for dumping build environments via the command-line.
> >
> > I couldn't ever figure out a good way to get only explicitly lister
> targets (non-default commandline targets).  It will essentially print the
> node.get_env().Dump() for all targets with a build_env defined.
> >
> > I could potentially change it from "--debug=envdump" to something like
> "--envdump=<VARIABLE>" so that it could print a particular variable rather
> than the whole env.
> >
> > Does this interest anyone or waste of chars?
> >
> >> diff -r 682b8a7a51fb src/engine/SCons/Script/Main.py
> >> --- a/src/engine/SCons/Script/Main.py    Mon Jun 29 15:37:44 2015 -0400
> >> +++ b/src/engine/SCons/Script/Main.py    Thu Aug 06 23:44:50 2015 -0400
> >> @@ -391,6 +391,21 @@
> >>      def prepare(self):
> >>          pass
> >>
> >> +class EnvDumpTask(SCons.Taskmaster.AlwaysTask):
> >> +    """SCons task for --debug=envdump.  Prints env dump for
> BUILD_TARGETS."""
> >> +    def prepare(self):
> >> +        pass
> >> +
> >> +    def execute(self):
> >> +        for target in self.targets:
> >> +            if target.get_build_env():
> >> +                print 'Environment dump for target: ' + str(target)
> >> +                print target.get_env().Dump()
> >> +
> >> +    def executed(self):
> >> +        pass
> >> +
> >> +
> >> class QuestionTask(SCons.Taskmaster.AlwaysTask):
> >>      """An SCons task for the -q (question) option."""
> >>      def prepare(self):
> >> @@ -657,6 +672,7 @@
> >>      if "memory" in debug_values:
> >>          memory_stats.enable(sys.stdout)
> >>      print_objects = ("objects" in debug_values)
> >> +    options.debug_envdump = ( "envdump" in debug_values )
> >>      if print_objects:
> >>          SCons.Debug.track_instances = True
> >>      if "presub" in debug_values:
> >> @@ -1210,8 +1226,13 @@
> >>          failure_message = "done building targets (errors occurred
> during build)."
> >>      else:
> >>          failure_message = "building terminated because of errors."
> >> +
> >> +    if options.debug_envdump:
> >> +        task_class = EnvDumpTask
> >> +
> >>      if options.question:
> >>          task_class = QuestionTask
> >> +
> >>      try:
> >>          if options.clean:
> >>              task_class = CleanTask
> >> diff -r 682b8a7a51fb src/engine/SCons/Script/SConsOptions.py
> >> --- a/src/engine/SCons/Script/SConsOptions.py    Mon Jun 29 15:37:44
> 2015 -0400
> >> +++ b/src/engine/SCons/Script/SConsOptions.py    Thu Aug 06 23:44:50
> 2015 -0400
> >> @@ -673,7 +673,7 @@
> >>          "tree"          : '; please use --tree=all instead',
> >>      }
> >>
> >> -    debug_options = ["count", "duplicate", "explain", "findlibs",
> >> +    debug_options = ["count", "duplicate", "explain", "envdump",
> "findlibs",
> >>                       "includes", "memoizer", "memory", "objects",
> >>                       "pdb", "prepare", "presub", "stacktrace",
> >>                       "time"]
> >>
> >
> >
> > V/R,
> > William
> >
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> >
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>
>
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