You can modify the
max_print_line, adding to the "local"
texmf.cnf file, whose location depends on the distribution you're using; for TeX Live it is
and the lines to be added are
The first number is actually arbitrary, but 1000 seems to be sufficient. The
error_line variable must be less than 255 and the maximum value of
half_error_line is less than
For experimenting you can also set the variables in the environment; assuming a Bash shell,
You can find the location of the various
texmf.cnf files, in the order they're looked at, by running
kpsewhich -a texmf.cnf
from the command line. On my system I get
The “year part” in the path can and will vary according to the currently installed version of TeX Live.