[Numpy-discussion] Copyright status of NumPy binaries on Windows/OS X

Carl Kleffner cmkleffner at gmail.com
Fri Oct 10 17:42:21 EDT 2014

this applies to the mingw-w64 builds as well

see also:


  From: "Joseph S. Myers" <joseph at codesourcery dot com>
  To: FX <fxcoudert at gmail dot com>
  Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>,
      fortran List <fortran at gcc dot gnu dot org>
  Date: Mon, 6 Oct 2014 20:38:14
  Subject: Re: [patch] Add -static-libquadmath option

  Since -static-libquadmath introduces LGPL requirements on redistributing
  the resulting binaries (that you provide source or relinkable object
  to allow relinking with modified versions of libquadmath) that don't
  otherwise generally apply simply through using GCC to build a program
  if you link in GCC's other libraries statically, it would seem a good
  for the documentation of this option to make that explicit.

  Joseph S. Myers


2014-10-10 23:28 GMT+02:00 Julian Taylor <jtaylor.debian at googlemail.com>:

> On 10.10.2014 23:07, Matthew Brett wrote:
> > Hi,
> >
> > On Tue, Oct 7, 2014 at 5:13 PM, Julian Taylor
> > <jtaylor.debian at googlemail.com> wrote:
> >> On 06.10.2014 18:54, Andrew Collette wrote:
> >>> Hi all,
> >>>
> >>> I am working with the HDF Group on a new open-source viewer program
> >>> for HDF5 files, powered by NumPy, h5py, and wxPython.  On Windows,
> >>> since people don't typically have Python installed, we are looking to
> >>> distribute the application using PyInstaller, which embeds
> >>> dependencies like NumPy.  Likewise for OS X (using Py2App).
> >>>
> >>> We would like to make sure we don't accidentally include
> >>> non-open-source components... I recall there was some discussion here
> >>> about using the Intel math libraries for binary releases on various
> >>> platforms.  Do the releases on SourceForge or PyPI use any proprietary
> >>> code?  We'd like to avoid building NumPy ourselves if we can avoid it.
> >>>
> >>> Apologies if this is explained somewhere, but I couldn't find it.
> >>>
> >>> Thanks!
> >>> Andrew Collette
> >>
> >>
> >> Hi,
> >> the numpy win32 binaries on sourceforge do not contain any proprietary
> >> code. They are build with mingw 3.4.5 and are using a f2c'd version of
> >> netlib blas and lapack which so far I know is public domain.
> >> I think the macos wheels on pypi are built using ATLAS but they do also
> >> contain libquadmath which is LGPL licensed. Its probably pulled in by
> >> fortran (could maybe be removed by a rebuild as neither blas nor numpy
> >> use it)
> >
> >
> > Julian - it would be good to remove libquadmath with a rebuild - any
> > pointers on how to do this?
> >
> You'd probably have to rebuild gfortran with quadmath disabled. It is a
> configuration flag of the gcc build. Then rebuild the binaries with that
> toolchain.
> But I'm not convinced it needs to be removed. Is LGPL really a problem?
> As long as you don't static link it (and not also ship the objects) it
> should be fine also for commercial programs.
> Note that there is no -static-quadmath flag, most likely because it
> would allow accidental license violation.
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