[bug #64155] [troff] specifying -fZD on command line generates warnings

[Dave]

Follow-up Comment #37, bug #64155 (group groff):

[comment #34 comment #34:]
> Maybe it is time for a proper string equality operator in our
> conditional expressions.

While that would be a useful addition to the language, equivalent
functionality can be achieved in user space, in a way back compatible to
almost any older troff.

.de string_compare
.  ft TR
.  ie '\\$1'\\$2' .nr strings_equal 1
.  el .nr strings_equal 0
.  ft P
..
.
.ft ZD
.
.if 'foo'foo' .tm foo = foo, via output comparison operator
.if 'foo'bar' .tm foo = bar, via output comparison operator
.
.string_compare foo foo
.if \n[strings_equal] .tm foo = foo, via string_compare macro
.string_compare foo bar
.if \n[strings_equal] .tm foo = bar, via string_compare macro




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