#6743: cygwin metaticket: port Sage to Microsoft Windows (via Cygwin): stage 1
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make building Sage automatic
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Reporter: was | Owner: was
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-5.9
Component: porting: Cygwin | Resolution:
Keywords: sd31 sd32 | Work issues:
Report Upstream: N/A | Reviewers: Jean-Pierre Flori, Dmitrii
Pasechnik, Karl-Dieter Crisman, Mike Hansen, William Stein, Luis Tabera
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by jpflori):
Replying to [comment:224 jpflori]:
> Replying to [comment:222 leif]:
> > Replying to [comment:221 jpflori]:
> > > Strange that the fact $SAGE_LOCAL/bin is in $PATH is not sufficient
but whatever.
> > > And not sure why in sage-enc $SAGE_LOCAL/lib is appended rather than
prepended.
> > > I mean, were prepending $SAGE_LOCAL/bin, so...
> >
> > ? In both cases (`PATH` as well as `LD_LIBRARY_PATH`), directories get
'''pre'''pended (provided they exist).
> It seems PATH is not, in sage-env:
> {{{
> export PATH="$SAGE_PACKAGES/bin:$SAGE_LOCAL/bin:$PATH"
> }}}
And I think it's normal.
We want Sage binaries to be found first.
As far as [LD_]LIBRARY_PATH is concerned, I wouldn't find it so disturbing
to prepend SAGE local dirs as well.
But note that PATH is usually set (or the shell used might not be so
useful) whereas [LD]_LIBRARY_PATH is not.
So prepending our local values in the first case is really the most
sensible choice, whereas in the second you might think that the user has
added something unusual knowingly and he wants it first, if that breaks
that's his problem.
> >
> > On Unices, `libpython-*.so*` is in `$SAGE_LOCAL/{lib,lib32,lib64}/`,
so can be found along `$LD_LIBRARY_PATH`.
> But on Cygwin its in .../bin/ whence the problem I guess.
> >
> > If Cygwin's `dlopen()` conforms to POSIX (it probably does), it
doesn't use `PATH` but `LD_LIBRARY_PATH` (if set), unless an absolute path
was given in the filename argument.
> Yup.
> That's fine, but also disturbing as all the (rest of the) dll magic uses
PATH rather than LD_LIBRARY_PATH on Cygwin.
> >
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6743#comment:225>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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