Understanding Make in C -

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i seasoned developer in java , had learned c in college days, brushing c skill , following tutorial here

i trying follow tutorial on makefile here author says: 

does file ex1 exist already? no. ok, there file starts ex1? yes, it's called ex1.c. know how build .c files? yes, run command cc ex1.c   -o ex1 build them. shall make 1 ex1 using cc build ex1.c.

but unable grasp, makefile , why used? parameters same? cflags? cc? new ubuntu although.

good explanation long.

short explanation: makefile set of instructions on how compile / build executable. includes relationships. example, "executable needs object files b , c. b compiled files x.c x.h y.c , y.h; c depends on k.c". if modifies k.c, know need recompile c don't need recompile b (just link b , c @ end).

as projects more complicated becomes more important.

as flags - there kinds of ways control compiler. want change these - say, want include more debug, or increase level of optimization; or change target architecture. these things controlled flags. setting variable contain these flags, can replace flags in many commands @ same time. can change compiler want use - might have different ones source code might contain more 1 language (mixtures of c , fortran still encountered in many numerical analysis libraries, example.)

cc c compiler. gcc (the gnu c compiler). other compilers include g++ (for c++), g77 (for fortran77), etc...

all of means using makefile great maintaining control , flexibility when compiling large , complex projects.

but - need read , not rely on written late @ night...


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