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Making GNU make only compile what it needs to

General and Gameplay Programming Programming

Started by dcosborn February 08, 2004 01:55 PM

1 comment, last by dcosborn 20 years, 2 months ago

dcosborn

674

Author

February 08, 2004 01:55 PM

I just started using GNU make and g++ a short time ago. I''ve noticed that make recompiles code that hasn''t been changed since the last time I compiled it. How do I make it only recompile changed code?

Promit

13,404

February 08, 2004 02:13 PM

Something to do with dependencies, I think.

Never really figured it out.

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Glubo

122

February 08, 2004 02:26 PM

it has something with the structure os Makefile
it is composed of targets, each target may depend on other target or file
here is some example:

all: binCC=g++bin: one.o two.o	$(CC) -o bin one.o two.oone.o: one.c one.h my.h	$(CC) -c -o one.o one.ctwo.o: two.c two.h my.h	$(CC) -c -o two.o two.c

It has one main target bin, which is combination of two source files one.c and two.c
one.c includes one.h and my.h
two.c includes two.h and my.h

[edited by - glubo on February 8, 2004 3:26:48 PM]

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