Re: bug#11034: Binutils, GDB, GCC and Automake's 'cygnus' option

[Stefano Lattarini <stefano.lattarini@gmail.com>]

On 04/02/2012 10:19 PM, Tom Tromey wrote:
>>>>>> "Stefano" == Stefano Lattarini <stefano.lattarini@gmail.com> writes:
> 
> Stefano> It should still be possible, with the right hack (which is
> Stefano> tested in the testsuite, and required by other packages
> Stefano> anyway).  The baseline is: if you don't want your '.info' files
> Stefano> to be distributed, then it should be easily possible to have
> Stefano> them built in the builddir; but if you want them distributed,
> Stefano> they will be built in the srcdir.
> 
> Now I am confused.  Is it possible to continue to work the way it does
> today, or not?
>
The point is: if you want to have info files build in the builddir *and*
distributed, than no, it won't be possible (without bending over backwards).
But I still don't understand why it's a big deal to have the '.info' files
placed in the srcdir *if you are going do distribute them*.

> If so, then great.
> 
> If not, then we need some other plan.
>
By looking at the 'handle_texinfo_helper' function in the automake script,
I suspect adding a new Automake option 'info-in-builddir' (say) and an
handful of lines to the automake script might be enough to give you an easy
way to force the '.info' files to be generated in the builddir.  But before
doing so, I'd like to understand why you want so strongly to support such
a setup.

> Tom> But, I see that, according to the Automake manual, I am wrong about that.
> 
> Stefano> Weird, I didn't expect that hack to be documented in the
> Stefano> manual...  And in fact I cannot find it.  Could you please
> Stefano> point me to it?  Thanks.
> 
>     http://www.gnu.org/software/automake/manual/automake.html#Cygnus
> 
> "Info files are always created in the build directory, and not in the
> source directory. Packages that don't use the cygnus option can emulate
> this effect by using the no-installinfo option and listing the generated
> info files in the CLEANFILES variable. "
> 
> Re-reading the suggestion here, I can't understand how it would work.
>
Another automake internal hack basically.  For more details, in case you are
interested, see code and comments in the 'automake.in:handle_texinfo_helper'
subroutine, and the test cases txinfo{23,24,25}.test in the Automake
distribution.

> Anyway the real use in the src tree is different, IIUC.
> Info files are built in the build tree by developers, but put in the
> source tree for distribution.
>
In such a setup, what is the issue with having the '.info' files built
in the srcdir?  It's not like the developers will develop with a
read-only source tree, right?

Regards,
  Stefano