What is CFLAGS variable used in Makefiles for?
 

Hello there, i noticed a variable called CFLAGS inside Makefiles, it differs from other variables, so, what is it for?

Thanks in advance.

Its for passing flags to the C compiler. Things like -ansi ( use ANSI standard C ) -W ( Turn on Warnings ) -Wall ( Report all warnings ) and many others.

There's also CPPFLAGS and CXXFLAGS, mainly used for C++.

Yeah, so i must store all gcc flags i want to use in CFLAGS assigning flags with the = ,and then, adding more ones with the += operator. Thanks.

You don't have to, you can add them directly to the commands. CFLAGS is good when you need one set of options for all files (like optimization, warinings etc).