#14406: Various prereq fixes
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Reporter: jdemeyer | Owner: drkirkby
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.9
Component: porting | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Jeroen Demeyer | Merged in:
Dependencies: | Stopgaps:
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Comment (by jpflori):
Replying to [comment:28 jpflori]:
> Replying to [comment:27 leif]:
> > Replying to [comment:26 jpflori]:
> > > Replying to [comment:23 leif]:
> > > > So what's your conclusion? (Regardless of perhaps cheating on
FreeBSD as well.)
> > > Don't really know.
> > > Check for sqrtl, logl, tgammal and lgammal everywhere except where:
> > > * we cheat, which is currently Cygwin,
> > > * we install Cephes, which is currently FreeBSD.
> > > And if that fails, rant that supported platform should provide "long
double" functions (except for the the two categories filtered out above)
and suggest:
> > > * setting SAGE_PORT to something non-empty,
> > > * and:
> > > * either try installing the Cephes spkg,
> > > * or cheating as on Cygwin.
> >
> > + * switch to another OS
> >
> > + Provide a link to the C99 standard.
> >
> > [[BR]]
> >
> > > Both of these will be non-trivial anyway.
> >
> > Really?
> Depends on who tries it...
> * Cheating as on Cygwin is easy if you know where to look, although you
should know a little bit of Sage to modify the R spkg, but I somehow agree
it is not a long term solution, we don't want to patch every part of Sage
which at some point will use "long double" functions... but then we can
hope that Cygwin also include these functions in their libm, as they did
for the "complex" functions, if every piece of software in the world need
them.
> * Don't really know if installing Cephes just works out of the box, i.e.
"oh I have a non-C99 compliant libm, let's just install cephes and every
piece of Sage looking for C99 libm functions will find them now", that's
surely the case but I've never tried.
I think that for the long term, especially if a lot of standard stuff we
need use "long double" functions by default and provide no way of easily
disabling their use (as R will do), the best solution would be to:
* check for sqrtl (or any random "long double" function);
* if that's not available, then set some SAGE_INSTALL_CEPHES variable
which triggers the installation of Sage;
* remove all the Cygwin "long double" hacks.
But please, let's do that later...
For the moment, just:
* check for sqrtl except on FreeBSD and Cygwin,
* rant if not available, provide links to C99 standard, suggest the user
to use a mainstream OS, invite him to have coffee or whatever (and maybe
mention the fact that if he dares to set SAGE_PORT, then he could also try
to manually install the cephes spkg when something fails because of the
lack of "long double" functions).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14406#comment:30>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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