Distributing BUILT_SOURCES dependencies and not target

Hi,

I am compiling a project with a swig generated file. Swig is a tool that 
takes a foo.i file and generates a foo_wrap.cxx (it can do more but no 
our concerne here ;-)).

In my Makefile.am, I put:

line 1: foo_wrap.cxx: foo.i  
line 2:     $SWIG -c++ -python foo.i
line 3:
line 4: BUILT_SOURCES: foo_wrap.cxx
line 5: libfoo.la_SOURCES: foo_wrap.cxx
line 6:
line 7: dist_data_DATA: foo.i

First question: I put line 7 because I want the .i file to be 
distributed so people can re-generate the .cxx file with their own 
version of swig ($SWIG is set by a m4 command SWIG_PROG in 
configure.in). Is this the correct way to do it. It seems make dist 
produce tarballs with the file in it som I am happy.

Second question: The problem is that foo_wrap.cxx gets distributed too. 
And since it is always more recent that .i file after I ran make. I 
don't have the expected behaviour. Downloaders of the lib won't get the 
foo_wrap.cxx regenerated. How do I remove this file from the dist.

Third question: with this Makefile.am, make dist produce a tarball that 
I can install, compile, etc... but make distcheck complains that it 
cannot find foo.i!! But it *is* in the tarball?!? I don't get at all 
what's happening here.

Thanks for the help.