#11635: Ensure that libraries link to the shared version of NTL by default
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Reporter: kcrisman | Owner: tbd
Type: defect | Status:
needs_review
Priority: minor | Milestone:
sage-5.4
Component: cygwin | Resolution:
Keywords: cygwin ntl libtool spkg | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Karl-Dieter Crisman, Jean-Pierre Flori | Merged in:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> In #11547, we added copying of several needed dlls on Cygwin. However,
> in the meantime NTL had a fairly major update (#5731).
>
> From version 5.5, NTL provides a new build system using libtool (although
> libtool itself is not provided!) to generate shared libraries.
> On Cygwin, libtool properly install the shared library as cygntl-?.dll in
> the bin directory and the import file as libntl.dll.a in the lib
> directory, together with a libtool file libntl.la and a static version of
> the library as libntl.a.
>
> In particular, this ensures that the shared version is linked with by
> default because ld/gcc/g++ find the .dll.a file in the lib directory
> (which points to the dll file in the bin directory) before the .a file.
>
> Moreover, only moving the previously built libntl.dll to libntl.dll.a was
> not a solution.
> Indeed, the built file hardcoded its own build-time name into itself (as
> a DT_SONAME on linux), so that libraries linked to it (before or after
> renaming, does not matter) would in fact search for a file with the build
> time name... and fail.
>
> The spkg available at
> http://perso.telecom-paristech.fr/~flori/sage/ntl-5.5.2.p0.spkg
> vastly simplifies the old spkg-install, uses the (slightly patched)
> upstream build system and includes its own version of libtool (or rather
> the tools needed to generate it on the fly).
New description:
In #11547, we added copying of several needed dlls on Cygwin. However, in
the meantime NTL had a fairly major update (#5731).
From version 5.5, NTL provides a new build system using libtool (although
libtool itself is not provided!) to generate shared libraries.
On Cygwin, libtool properly install the shared library as cygntl-?.dll in
the bin directory and the import file as libntl.dll.a in the lib
directory, together with a libtool file libntl.la and a static version of
the library as libntl.a.
In particular, this ensures that the shared version is linked with by
default because ld/gcc/g++ find the .dll.a file in the lib directory
(which points to the dll file in the bin directory) before the .a file.
Moreover, only moving the previously built libntl.dll to libntl.dll.a was
not a solution.
Indeed, the built file hardcoded its own build-time name into itself (as a
DT_SONAME on linux), so that libraries linked to it (before or after
renaming, does not matter) would in fact search for a file with the build
time name... and fail.
'''spkg''': http://www.infres.enst.fr/~flori/sage/ntl-5.5.2.p0.spkg
This spkg vastly simplifies the old spkg-install, uses the (slightly
patched) upstream build system and includes its own version of libtool (or
rather the tools needed to generate it on the fly).
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11635#comment:54>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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