[gnumeric] fn-eng: fix conversion problem with --with-long-double

[Morten Welinder <mortenw src gnome org>]

commit 68ef4b4cbf731ba5f8ace0cf0b885751730a3ee6
Author: Morten Welinder <terra gnome org>
Date:   Sun Feb 6 13:36:20 2022 -0500

    fn-eng: fix conversion problem with --with-long-double

 plugins/fn-eng/ChangeLog   | 5 +++++
 plugins/fn-eng/functions.c | 5 +++--
 2 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/plugins/fn-eng/ChangeLog b/plugins/fn-eng/ChangeLog
index 257563d91..5e8605fab 100644
--- a/plugins/fn-eng/ChangeLog
+++ b/plugins/fn-eng/ChangeLog
@@ -1,3 +1,8 @@
+2022-02-06  Morten Welinder  <terra gnome org>
+
+       * functions.c (val_to_base): Make sure not to pass a long-double
+       format to g_ascii_formatd because it doesn't understand that.
+
 2022-01-20  Morten Welinder <terra gnome org>
 
        * Release 1.12.51
diff --git a/plugins/fn-eng/functions.c b/plugins/fn-eng/functions.c
index e307bc817..398e7f47f 100644
--- a/plugins/fn-eng/functions.c
+++ b/plugins/fn-eng/functions.c
@@ -144,9 +144,10 @@ val_to_base (GnmFuncEvalInfo *ei,
                if (val < min_value || val > max_value)
                        return value_new_error_NUM (ei->pos);
 
+               // For long-double we need a better replacement for this
                g_ascii_formatd (buf, sizeof (buf) - 1,
-                                "%.0" GNM_FORMAT_f,
-                                val);
+                                "%.0f",
+                                (double)val);
 
                v = g_ascii_strtoll (buf, &err, src_base);
                if (*err != 0)