c - How to include header file through makefile

Question

I know that there is a flag that can be used in makefile to include a header file in all the files which are being compiled, just like there is a -D flag to include a define. What flag is exactly for including header files. I don't remember know.

Answer 1

In your compile command, you can use the -include option:

gcc -o main -include hello.h main.cpp