需要帮助使用gcc编译C程序

Question

I am running FreeBSD 9.2, attempting to compile Dalnet ircd df4.6.5.

I am running into this error, and do not understand it.

channel.c:2536: error: lvalue required as left operand of assignment

Which is this line of code:

lopt->next = (LOpts *)lopt->yeslist=lopt->nolist=(Link *)NULL;

All of the previous answers to this error I have found was when someone has used = instead of == in an if statement, I know that this code compiles on earlier versions of FreeBSD, but I do not understand what it is doing in the first place to attempt to fix it.

Thank you.

Answer 1

(LOpts *)lopt->yeslist is not an lvalue. Hence the compiler error.

Change the line to:

lopt->yeslist=lopt->nolist=(Link *)NULL;
lopt->next = (LOpts *)NULL;