[PATCH, v3] Drop trailing white space in include/Makefile.am

[Ralf Wildenhues]

* Benjamin Kosnik wrote on Tue, Jun 24, 2008 at 09:03:12PM CEST:
> > - The white space in 'ext_builddir = ./ext ' can cause subtle bugs in
> > the generated Makefile.in (with newer automake, I was looking at a
> >   seemingly nonsensical build failure for a while).
> 
> I'll say this is subtle.... wow. In what version of automake does this
> start to be a factor?

Hmm.  Thinking about it, it doesn't get exposed unless another patch in
my queue is applied.  So I'm sorry I gave the wrong motivation here.

I have a patch that removes the install-headers* targets completely,
replacing them with automake macros like this:

  gxx_include_extdir = ${gxx_include_dir}/${ext_builddir}
  nodist_gxx_include_ext_HEADERS = ${ext_headers}

This means automake's install rules are used.  It's this patch that
exposes the trailing whitespace, by trying to access
$(gxx_include_extdir)/filename.h.

I haven't posted the patch yet, because, with Automake 1.9.6, it works
but is a lot slower than the install rules the file has currently.  With
current git Automake, however, it takes half the time.  So I was going
to propose this patch after a move to more recent autotools.

Cheers,
Ralf