How to write compile time warning for user

[unkn00wn]

i want to write a warning for every user that compile my code.

how can i do this?

i am using gnu g++ compiler.

[hanst99]

Try #warning

If it's not absolutely necessary though, don't do it (it just clutters the output of the compiler). And if it IS absolutely necessary - don't output a warning, fix the problem!

[unkn00wn]

Well i just want to tell user to compile program on linux terminal for ouput. and not to take ouput in file !

[ne555]

¿why do you care how I compile my programs?
Besides, that's quite restrictive.