I am trying to learn how to debug programs with gdb following Debugging with GDB.The first chapter of this book present a sample seesion to debug programs.My question is where could I get this buggy verion of m4?I want to redo this sample debug seession.
thanks.
The bug was likely injected into m4 on purpose (just to demonstrate GDB). I doubt there was ever an official release of GNU m4 which actually had this bug.
You can download any version of m4, change
len_lquote = strlen(lquote);
to
len_lquote = strlen(rquote);
in set_quotes(), and then redo the sample debugging session.
However, I see very little point in actually doing that. Your time would probably be spent more wisely if instead you select any open-source program you like and use, and try to find/fix a real open bug in it.
P.S. The online docs you referred to have moved here.