#14038: Let libgap build a shared library on Cygwin
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Reporter: jpflori | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.7
Component: packages | Resolution:
Keywords: cygwin spkg libgap | Work issues:
Report Upstream: N/A | Reviewers: Jean-Pierre Flori
Authors: Volker Braun | Merged in:
Dependencies: #14057 | Stopgaps:
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Comment (by dimpase):
Replying to [comment:18 jpflori]:
> And I don't really feel #14057 could fix anything here.
> It provides a fix for Python and it does not seem to me that libgap
links to Python anyway...
yes, I agree. I'll remove it from the deps.
> But I agree we would need a similar fix in libgap, that is properly
define environ in libgap (src/libgap.c) and not assume it is available.
I wonder if this is actually an OSX-specific libgap bug, to use
{{{-undefined dynamic_lookup}}} to get {{{environ}}}.
(or maybe this part of the code is never used in libgap setting)
[http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man7/environ.7.html
OSX docs] say that it's recommended to use {{{getenv()}}} etc, but that's
GAPs design to use {{{environ}}} directly (and it's needed for
{{{spawn()}}} etc there).
And {{{environ}}} is not available to shared libraries, according to
[http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man7/environ.7.html
loc.cit.], and one should use {{{_NSGetEnviron()}}} routine from
{{{<crt_externs.h>}}}. (So one could add this to {{{src/sysfiles.c}}} if
needed.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14038#comment:20>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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