Error: can't resolve `0' {*UND* section} - `__DTOR_LIST__' {.dtors section}

[William Tambe]

I have a gcc port that yield the following assembly to negate a
register by an immediate:
inc %11, -__DTOR_LIST__
In the above assembly example, register %11 is to be decremented by
__DTOR_LIST__ where __DTOR_LIST__ is a label.

To parse the immediate portion of the above assembly, the
corresponding gas port use the function parse_exp_save_ilp(); however
it yields the following error:

Error: can't resolve `0' {*UND* section} - `__DTOR_LIST__' {.dtors section}

parse_exp_save_ilp() is not able to evaluate an expression in which
the negation operator precede a symbol.

Any idea whether there is a different function that could be used to
parse such an expression ?

Sincerely,
William Tambe