[bug #64639] [mom] odd output with #64421 reproducer

[G. Branden Robinson]

Update of bug #64639 (project groff):

                  Status:                    None => Confirmed              
             Assigned to:                    None => PTPi                   
                 Summary: [mom] bug #64421 is a mom-bug => [mom] odd output
with #64421 reproducer

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Follow-up Comment #2:

This LTO stuff is no longer relevant; I've pushed a fix for that.

The issue with the input in comment #1 appears to be that _mom_ assumes that a
color named "default" exists (for me, it certainly defines a string _named_
`default` with the _contents_ `default`).

Whether this is a deliberate aspect of its design, I am not sure.  

What puzzles me more is the `COLOR` macro itself.

The following patch seems to make it do what it is documented to do.


diff --git a/contrib/mom/om.tmac b/contrib/mom/om.tmac
index b0fd1ef55..039bcfe48 100644
--- a/contrib/mom/om.tmac
+++ b/contrib/mom/om.tmac
@@ -1873,9 +1873,9 @@ end
 .MAC COLOR END
 .    ie \\n[.u]=1 \{\
 \c
-\\*[\\$1]\c
+\m[\\*[\\$1]]\c
 .    \}
-.    el \\*[\\$1]
+.    el \m[\\*[\\$1]]
 .END
 \#
 \# NEWCOLOR


But I didn't check all of `COLOR`'s call sites, so I'm not sure this is a
kosher fix.

Assigning to Peter for evaluation. 


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