[gnumeric] Solver: nosolve doesn't handle equality constraints.

[Morten Welinder <mortenw src gnome org>]

commit 247e929713a48c9ecd77484dbb08b964644195fb
Author: Morten Welinder <terra gnome org>
Date:   Wed May 6 09:26:31 2015 -0400

    Solver: nosolve doesn't handle equality constraints.

 plugins/nlsolve/ChangeLog     |    5 +++++
 plugins/nlsolve/gnm-nlsolve.c |   17 +++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)
---
diff --git a/plugins/nlsolve/ChangeLog b/plugins/nlsolve/ChangeLog
index 4dc2acc..60ee4fa 100644
--- a/plugins/nlsolve/ChangeLog
+++ b/plugins/nlsolve/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-06  Morten Welinder  <terra gnome org>
+
+       * gnm-nlsolve.c (check_program): We really don't handle equality
+       constraints so detect that.
+
 2015-04-24  Morten Welinder  <terra gnome org>
 
        * gnm-nlsolve.c: Recast in terms of GnmIterSolver.
diff --git a/plugins/nlsolve/gnm-nlsolve.c b/plugins/nlsolve/gnm-nlsolve.c
index 55d55dd..7c31ba8 100644
--- a/plugins/nlsolve/gnm-nlsolve.c
+++ b/plugins/nlsolve/gnm-nlsolve.c
@@ -68,9 +68,15 @@ check_program (const GnmSolverParameters *params, GError **err)
 
        for (l = params->constraints; l; l = l->next) {
                GnmSolverConstraint *c  = l->data;
-               if (c->type == GNM_SOLVER_INTEGER ||
-                   c->type == GNM_SOLVER_BOOLEAN)
+               switch (c->type) {
+               case GNM_SOLVER_INTEGER:
+               case GNM_SOLVER_BOOLEAN:
                        goto no_discrete;
+               case GNM_SOLVER_EQ:
+                       goto no_equal;
+               default:
+                       break;
+               }
        }
 
        return TRUE;
@@ -81,6 +87,13 @@ no_discrete:
                     0,
                     _("This solver does not handle discrete variables."));
        return FALSE;
+
+no_equal:
+       g_set_error (err,
+                    go_error_invalid (),
+                    0,
+                    _("This solver does not handle equality constraints."));
+       return FALSE;
 }
 
 static void