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Re: svn commit: r15653 - branches/python-bindings-improvements/build/generator

From: David James <james82_at_gmail.com>
Date: 2005-08-10 17:10:14 CEST

On 8/10/05, Branko ╚ibej <brane@xbc.nu> wrote:> >Really? Where? This module is cross-platform, so it needs to work on> >both Unix and Windows.> I was thinking of the *.exe tracking, and write_long_long_fix.Oh, I understand you now.
Do you think that such code belongs in a separate, windows-specificmodule? The "*.exe" tracking does not benefit Unix users, but it doesnot hurt them either. The write_long_long_fix may potentially benefitsome Unix users, if they are using a compiler which does not support"long long".
> >>and b)> >>contains utilities (such as $PATH search??? what on earth for?)> >>> >>> >$PATH search can be useful for verifying the existence of an> >executable. We currently use this feature to double check whether the> >"apr-config" executable exists and is in your path. It's an easy> >sanity check.> >> >> And for the swig executable... but you don't need path searching for> this. You simply run the program, and if it's in $PATH, it'll work; if> it's not, it won't.> > If you see a --with-foo option, then of course you don't search the> $PATH at all.For SWIG, we don't search $PATH. We search a list of potentialdirectories where we think SWIG might be. If the user specifies--with-swig=$VALUE, we search for SWIG in the following paths: $VALUE, $VALUE/swig, $VALUE/swig/bin/swig
If the user accidentally specifies the "directory" containing the SWIGexecutable instead of the executable itself, this implementation will*just work*. So there's no need for tech support. See the code thatimplements this below:
      elif key == '--with-swig': if self._is_executable(value): self.swig_path = value elif self._is_executable("%s.exe" % value): self.swig_path = "%s.exe" % value else: dirs = [ value, os.path.join(value, "bin") ] self.swig_path = self._find_executable("swig", dirs)
We could probably simplify the above code to:
      elif key == '--with-swig': dirs = [ "", value, os.path.join(value, "bin") ] self.swig_path = self._find_executable("swig", dirs)
> >>This is the sort of spaghetti code we've been struggling to keep out of> >>the generator. Merging this to trunk as it is now would make me very> >>uncomfortable.> >>> >>> >I'm new to the Makefile generator, so I made some newbie design> >mistakes. However, these are fortunately easy to fix. Here's my plan:> >1. Move cross-platform path-finding functionality from gen_swig.py and> >gen_win.py into a common base class, so that both Unix and Windows> >implementations can benefit. I'll call this "gen_path.py".> >2. Move SWIG file generation from gen_swig.py into a separate> >command-line utility,> >> I suggest you make this loadable as a python module as well.Will do.
> > > which can be called from both the Unix and the> >Windows generators and makefiles. As a side-benefit, this change will> >allow us to automatically regenerate the SWIG-wrappers for each ".h"> >header file on-the-fly when the user types "make".> >> >> O.K.> > >3. Move Makefile generation from gen_swig.py into gen_make.py. After> >this, there'll be nothing left in gen_swig.py, so we can delete it.> >> >> O.K.
Great! I'll implement these ideas, then. I don't have the environmentto test changes to the Windows build system, so I will have to beextra careful while refactoring. Your feedback is very helpful.

-- David James -- http://www.cs.toronto.edu/~james
Received on Wed Aug 10 17:11:07 2005

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