How to pass values during compilation with g++ using -DN flag

Question

I've heard that you can set values in your c++ program during compilation using g++'s -DN flag. Can anybody explain how? Thank you

have you read the man page for gcc? if I google `man gcc` and search for `-D` (and understand the preprocessor), it seems quite clear — KevinDTimm, Mar 11 '13 at 12:20

score 13 · Answer 1 · answered Mar 13 '13 at 01:11

13

-DXXX flag is just like adding #define XXX. So -DN=2 is just like #define N 2.

And you can pass values during compilation using this flag.

Reference:

answered Mar 13 '13 at 01:11

Kun Ling

1 Answers1