Including a #define in all .c source files at compile time

Question

I need to include a #define at the top of around 300 .c files. I would prefer not to change the code as it is open source code but if I have to I will just wri

Answer 1

gcc option -D:

-D name
    Predefine name as a macro, with definition 1.

-D name=definition
    ....

so, in your case, gcc ... -Dmalloc=MYmalloc