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Dear XML-DEV list.
I am posting this message to you about a sore point
in the GPL : Linkage.
XML has brought in a way to represent data in such a
way that it undermines the way that the GPL contract
is written :
XML can be used to replace the linker.
XML-RPC and Soap are just two ways to invoke remotely.
Currently I am using a patched version of the GNU C
Compiler that streams the XML into a perl script via a
PIPE using POPEN.
This causes all types of problems with the GPL and I
just wanted to bring that up here and see if you have
anything to say.
Following is my message to the GCC mailling list.
Mike
--- James Michael DuPont <mdupont777@yahoo.com> wrote:
> From James Michael DuPont Thu Feb 28 02:21:14 2002
> Date: Thu, 28 Feb 2002 02:21:14 -0800 (PST)
> From: James Michael DuPont <mdupont777@yahoo.com>
> Subject: Linkage of GPLed GCC to Closed Source via
> XML or Perl
> To: gcc@gcc.gnu.org
>
> Dear GCC Developers,
>
> For the past three years, I have been working on a
> project to create a object oriented interface to the
> GCC compiler, the GCC Node Introspector
> (http://introspector.sourceforge.net/).
>
> This turned from a c++ into a Perl project after
> realising the power of Perl for handling strings and
> complex data structures.
> Currently I am using a modified version of c-dump.c
> like done in CPPX
> (http://swag.uwaterloo.ca/~cppx/doc/cppx/arch.html).
> I
> output the tree nodes into a XML form that is very
> similar to the tree dump, just with xml syntax.
> This
> is streamed into a Perl program via popen and
> written
> to a Postgres database.
>
> Also the number of tools that link into perl are
> amazing.
> The linkage of Perl is permissive, but I think that
> the linking of programs can to GPL code can be very
> tricky, and full of problems as a detailed review of
> the GPL and LGPL can point out.
>
> In this article :
> http://lwn.net/2001/features/LarryWall/Perl
> >> CL: Would you give us an example of cultural
> problems?
> >>Larry Wall: Ten years ago or so, we had Richard
> Stallman's GPL, and Perl was licensed under that.
> And
> I discovered
> >> that that worked fine for the hacker community,
> for
> the geeks, but it prevented Perl from being used in
> a
> >> commercial environment. So I wrote my own
> license.
> But I didn't want to offend the free software, the
> GPL
>
> >> people.
> >>So, rather than switching licenses, I said "Well,
> let's have both licenses and you may distribute Perl
> under >>either of them at the same time." And that
> way, the computer crowd, they had their insurance
> that
> their rights >>would not be taken away, and the
> companies had some insurances that their rights
> would
> not be taken away, and >>everyone was happy. That's
> sort of cultural hack that I'm talking about.
>
> Does that mean that via perl a company can create a
> close-source gcc backend?
> Without external representation via XML?
>
> Let us review the the GPL and its implications for
> linking to Perl :
>
> Lets look at the GPL :
> >This General Public License does not permit
> incorporating your program into proprietary
> programs.
> >If your program is a subroutine library, you may
> consider it more useful to permit linking
> proprietary
> >applications with the library.
> >If this is what you want to do, use the GNU Library
> General Public License instead of this License.
>
> My GPL Comment:
> incorporating is a term that implies to me
> containment,
> If I write a proprietary program that uses the
> output
> of the GPL Code is that containment?
>
> If I open the a pipe to another program, and call
> functions in it using data from a GPL program, is
> that
> not what a linker does, but via a different method?
>
> Lets look at the LGPL 2.1
> > We use this license for certain libraries in order
> to permit linking those libraries into non-free
> programs.
> > When a program is linked with a library, whether
> statically or using a shared library, the
> combination
> of the two is legally speaking a combined work, a
> derivative of the original library.
> >The ordinary General Public License therefore
> permits
> such linking only if the entire combination fits its
> criteria of freedom.
> > The Lesser General Public License permits more lax
> criteria for linking other code with the library.
>
> LGPL Comment :
> Now this does not cover linking via RPC/IPC or
> Shared
> Memory or File.
> Let alone CORBA or XML-RPC/SOAP.
> This comes done to the definition of linking, is
> linking only with the linker, or is linking a method
> of passing data between function calls?
> Can I call a GPLed Function in GIMP via a perl
> script
> webpage, but I cannot link to it?
>
>
> LGPL part 2 :
> >14. If you wish to incorporate parts of the Library
> into other free programs whose distribution
> conditions
> are >incompatible with these, write to the author to
> ask for permission. For software which is
> copyrighted
> by the Free Software Foundation, write to the Free
> Software Foundation; we sometimes make exceptions
> for
> this.
> >Our decision will be guided by the two goals of
> preserving the free status of all derivatives of our
> free software and of promoting the sharing and reuse
> of software generally.
>
>
> LGPL Comment part 2 :
>
> "distribution conditions are incompatible with
> these"
> Does that cover PAL which gives you more freedom?
> Can I link via Perl and all of a sudden, there is no
> more GPL?
>
> By these terms, would every Perl script which links
> in
> with GPLed GIMP via script would require such
> permission to be asked?
>
> The perl script is called from an apache server,
> goes
> across all types of close-source maybe even patented
> software sitting on routers and switches, and then
> gets displayed in a microsoft browser, only to call
> a
> javascript function that uses the microsoft api to
> draw on some graphic card.
>
> As you can see, the network has changed the meaning
> of
> linking. Perl has changed it as well.
>
> Also see the discussion of this subject on perl
> monks
> http://www.perlmonks.org/index.pl?node_id=148162
>
>
> James Michael DuPont
>
> mdupont777@yahoo.com
>
>
>
> =====
> James Michael DuPont
>
> __________________________________________________
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=====
James Michael DuPont
__________________________________________________
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