wgnuplot log errors to a file

[Tim H. <tim...@un...>]

Hello,

I am calling wgnuplot from an external program. Since there is no error 
stream attached one cannot receive error messages. The exit code just 
indicates that there is an error but not which. Therefore it would help, 
if there was an option to write errors to a file, e.g.:

wgnuplot -log error.log

I think it should be quite simple. One could intercept the error 
messages in MyFPrintF and similar functions.

Before starting to implement, I would like to have some comments on the 
idea form more experienced gnuplot developers.

Thanks,
Tim