What is -ll gcc's flag?

Question

I'm trying to compile a program that there is -ll flag but gcc can't find. What is the l after -lreally a library or is this a typo? is hard find information about this on google.Such term is "vague".

Answer 1

-ll means to link against Solaris's libl lex library (available in /usr/lib/libl.so).

(The -l option takes the name of the library, minus the lib prefix and the file extension.)

Answer 2

As in my case, flex by default didn't install libfl library (using Linux Mint)

So I had to install libfl-dev library separately

sudo apt install libfl-dev

and include a -lfl option instead of -ll in the commandline as in

gcc myfile.c -lfl -o myfile