-TD
: Permit processing of deferred macro definitions
Deferred macro definitions are @m
(or, equivalently,
@#define
) commands that appear in the code part rather than
the usual definition part. These definitions are evaluated during the
output (phase 2), and can cause confusion when used with the
preprocessor commands, which are evaluated during the input (phase 1).
Because of this confusion, deferred macro definitions are prohibited by
default. To permit them, use the -TD
option (then be prepared
to make some obscure programming errors).