Write to log without wrapping

Output file line wrapping is controlled by the max_print_line setting in texmf.cnf (for TeX Live, miktex may have another system that I do not know).

The default setting is:

max_print_line = 79

I am pretty sure the wrapping behaviour is hardwired in TeX itself. Why can't you simply write to a separate file instead?

\newwrite\mylog
\immediate\openout\mylog=\jobname.mylog