#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: 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 leif):
Replying to [comment:206 kcrisman]:
> In the prereq spkg log, at the end:
> {{{
> ...
> checking for sqrtl in -lm... no
> configure: You have an outdated and/or broken math library.
> configure: error: Exiting, since the library function 'sqrtl()' was not
found.
> ...
> }}}
> Supposedly this was (I think?) provided by Cephes, but of course that
never actually built on Cygwin, as JP discovered.
WHAT?! The only reason for including Cephes as a standard package was
Cygwin, because it was said to lack some `long double` versions ('`l`'
suffix) of standard math functions (such as `sqrt()`).
> Grepping through the entire Sage root directory shows that sqrtl mostly
comes in play with Pynac and !Scipy/Numpy, and we seem to even (?) define
our own sqrtl...
I recall somebody somewhere replacing (`#define`ing?) `sqrtl()` by
`sqrt()`, arguing `double` precision was sufficient there, for the sake of
Cygwin, and that AFAIK didn't get removed even after the inclusion of
Cephes. (Not 100% sure whether it was really `sqrt()`; probably some
other function, but Cygwin was lacking its `long double` implementation.)
> oh, also in the partitions code in combinat this is needed. The Pari
references I think are to sqrtlift, something else. Maybe we don't need
this any more? I presume this was added by David Kirkby for Solaris or
other platforms with weird base libraries.
Certainly not for Solaris... ;-)
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6743#comment:209>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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