[Octave-bug-tracker] [bug #55956] build overlinks with SUNDIALS libraries even when HAVE_SUNDIALS is unset

[Mike Miller]

URL:
  <https://savannah.gnu.org/bugs/?55956>

                 Summary: build overlinks with SUNDIALS libraries even when
HAVE_SUNDIALS is unset
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Tue 19 Mar 2019 11:34:49 AM PDT
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: In Progress
             Assigned to: mtmiller
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: GNU/Linux

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Details:

When building Octave 5.1.0 on a system with SUNDIALS version 3 or 4 installed,
configure correctly detects that the library is not compatible and correctly
does not set HAVE_SUNDIALS, so all features in '__ode15__.oct' are disabled.
But the oct file is still linked to libsundials_ida and
libsundials_nvecserial, even though it uses no functions from those libraries
(overlinking).

I have a patch to configure that will clear all of the SUNDIALS associated
build variables if and only if HAVE_SUNDIALS is not set, suitable for stable,
and already tested on one system with SUNDIALS 3.1.2 and one with SUNDIALS
2.7.0. There are no regressions on the latter that I can see, and the oct file
is now not linked with the libraries on the former, which is the desired
outcome.

Will push to stable once I have a bug number.




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