Makefile

deveshs · 05-02-2005, 03:53 AM

Hi all I am trying to write a Makefile to compile my driver code and install the devices also my scriot is as follows.....
'contents of Makefile'

install:
@echo "********* Installing the $(TARGET) Module *********"
for MINOR_NUM in 0 16 32 48 64 80 ; do \
if [ -e $(DEVICE)$(MINOR_NUM) ]; then \
echo "Device $(DEVICE)$(MINOR_NUM) already exists"; \
else \
mknod $(DEVICE)$(MINOR_NUM) c $(MAJOR_NUM) $(MINOR_NUM); \
chmod 664 $(DEVICE)$(MINOR_NUM); \
fi; \
MINOR_NUM=$( ($MINOR_NUM+16) ); \
@echo $(MINOR_NUM); \
done

But in this script value of MINOR_NUM always remains 0 and I want it to cahnge each time it gose to the starting of the loop....
Is it the correct way to do this in a makefile If not then how I can do that..??
plz help me out

jlliagre · 05-02-2005, 04:47 AM

Use $(DEVICE)$$MINOR_NUM instead, and do not use the @ prefix in shell continuation lines, unless you have a shell command whose name is "@echo", which I doubt ...

deveshs · 05-02-2005, 10:36 AM

Hi I tried the solution whcih u told but still that is not working ..my fundamental question is.....How Can I put for loop in a makefile ? please tell me.
I my code even this is not working
install:
@echo "********* Installing the $(TARGET) Module *********"
for VAR in 0 16 32 48 64 80 ; do \
echo $(VAR); \
done
echo "Calling insmod"
The code is supposed to print 0 16 32 48 64 80 but it is printing only 0 if previously initialized with 0 otherwise prints space character instead. But loop itrates 6 times......what should I do to get proprer output?

jlliagre · 05-02-2005, 11:14 AM

Hmm, read again, the solution I suggested is working.

You are confusing Makefile variables and shell variables. $(something) is referring to a make variable, but for your inserted shell script, the correct way to have make ignoring the $ is by doubling it.
Also, with the piece of code you post, it is not printing "0" but an empty string.

Try:

Code:

install:
  @echo "********* Installing the $(TARGET) Module *********"
  for VAR in 0 16 32 48 64 80 ; do \
  echo $$VAR; \
  done

deveshs · 05-02-2005, 11:34 PM

Thanx buddy It worked .......Can I get help from you on device driver programming? Or otherwise u may have some good buddy list who can help in this topic? Please tell me..thanx once again
bye

jlliagre · 05-03-2005, 01:15 AM

Device driver programming, specially on Linux is clearly not my cup of tea, but no doubt you'll find help from someone else ...