How is it done that making 2.6 kernel it doesn't display full command line?

rsashok · 11-30-2006, 06:33 PM

How is it done that while compiling kernel the make utility doesn't print full compilation line including "/path_to_gcc/gcc -I's and -D's file.c -o file.o", but just 'CC', 'LD' etc.? How could I examine "-D's" which are used during compilation? Or is it possible to enable old style outputs on the display? Where could I find explanation for possible abbreviations, something like "CC [M]" is quiet clear, but is there other more exotic lettering?

matthewg42 · 12-01-2006, 11:05 AM

I have wondered this myself, but I was never curious enough to bother looking in the Makefile to find out.

Indiestory · 12-01-2006, 11:42 AM

isnt the kernel completely independant from gcc? isnt it built from its own form of C no intirely sure but im sure i read it somewhere. Try the Documentation folder in the kernel source , or kernel.org

rsashok · 12-01-2006, 01:36 PM

I don't think that kernel is independant from "gcc" at all. Try to compile a new kernel with gcc ver.2.xx - it complains that compiler version is too old, and wants you to have versions above 3 (I think gcc. v4.xx is the latest at the moment). But if I use the same compiler with my own makefile - it gives me the same 'old' style outputs on the screen. I actually tried to look at the Linux makefiles, but didn't see any specail setting. But I am not 'make' expert. I will try to dig up at the 'kernel.org', if I see anything on the subject.

rsashok · 12-07-2006, 12:26 PM

I am still puzzled with this issue. Can't find anything on the subject. Is there any 'resedue' files left by the kernel compilation to see what happened?

Harmaa Kettu · 12-07-2006, 01:30 PM

From line 32 of the top-level kernel 2.6.19 makefile...

Code:

# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

...and this is how it works (kernel makefiles are "a little" more complex but the idea is similar):

Code:

ifeq ($(V),1)
  Q =
else
  Q = @   
endif

test: test.c
	$(Q)echo "Compiling $^"
	$(Q)gcc $^ -o $@