Make files confuse me

Everything Unix Technical

Started by eedok November 02, 2004 01:06 AM

4 comments, last by jbm 20 years ago

eedok

Author

982

November 02, 2004 01:06 AM

well this is my Makefile:


CC = gcc -Wall -std=c99
editor:  
        $(CC) editor/main.c -oedit `sdl-config --cflags --libs` -s -O4
all:
        $(CC) editor/main.c -oedit `sdl-config --cflags --libs` -s -O4

Why is it that it works when I go make all, but when I go make editor it goes: make: `editor' is up to date.

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Fruny

1,658

November 02, 2004 01:16 AM

After the colon in a rul should be listed the dependencies for that target. If a dependency gets modified, the target gets rebuilt.

For example:

CC = gcc -Wall -std=c99all:    editoreditor: editor/main.c         $(CC) editor/main.c -oedit `sdl-config --cflags --libs` -s -O4

The first rule is the one that gets selected if you just do make (as opposed to, say, make editor).

Using GNU make, there are a number of ways you can simplify your makefile: check out the info pages (info make), or the manual.

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

oddbot

235

November 02, 2004 01:17 AM

Maybe a bit of tweaking:

CC=gccCFLAGS= -Wall -std=c99 `sdl-config --cflags` -s -O4LDFLAGS= `sdl-config --libs`all: editedit: editor/main.c        $(CC) -oedit main.c $(CFLAGS) $(LDFLAGS)

Anyway the reason why its not updating is that it see the directory 'editor' already exists with no dependencies, so it doesnt bother trying to compile it.

You might want to peek at This Thread for some other ideas.

-oddbot