Let's say having a SQF file that contains t his:
_a = '"' ; // comment
Where _a contains a string with a single double quotation mark. compile preprocessFileLineNumbers ing this SQF returns an error and fails to compile because preprocessed code still have the comment.
Having both that string and a comment can cause this. No comment line there won't throw an error.
Looks like every preprocessor thing still works in single quotes '
So unfortunately I don't think we can fix this, for backward compatibility.
One example would be this (tho not sure if someone even does this at all):
#define MACRO 1 _script = ' systemChat "MACRO" '; call compile _script;
If it ignored double quotes " in single quotes ', calling _script would print 1 instead of MACRO
Also to expand your ticket, there are many more cases that will break the preprocessing, for example:
'// this becomes a comment'
it'll PP into just ', which is a compile error