Re: 2.6.24-rc1-82798a1 compile failure (x86_64)

[Giacomo Catenazzi <cate@cateee.net>]

Adrian Bunk wrote:
> On Sun, Nov 04, 2007 at 02:31:33AM -0800, David Miller wrote:
> > From: Ingo Molnar <mingo@elte.hu>
> > Date: Sun, 4 Nov 2007 11:04:29 +0100
> >
> > > * Adrian Bunk <bunk@kernel.org> wrote:
> > >
> > > > I also have CFLAGS set on some computers in my environments since for 
> > > > packages using GNU autoconf that's the correct way to set the compiler 
> > > > flags.
> > > >
> > > > The kernel already sets all flags correctly, and a user wanting to 
> > > > change the flags for the kernel is an exception with very special 
> > > > needs (I'd even claim so special that he could simply edit the 
> > > > Makefile...).
> >  ...
> > > At minimum the extra CFLAGS needs to be put into the .config - but 
> > > that's not a too nice solution either. How about just adding an 
> > > extra-CFLAGS option to .config and perhaps a 'make configpickupCFLAGS' 
> > > pass for anyone who wants to propagate the environment CFLAGS into the 
> > > kernel build.
> > I totally disagree.
> >
> > People can't have it both ways.  CFLAGS has global meaning in every
> > Makefile based build tree, it's not an "autoconf" thing.  This is well
> > established practice, and I think it's a good thing the kernel does it
> > now too.
>
> Makefiles do normally not pick such variables from the environment.

????

Are you sure???

From http://www.gnu.org/software/make/manual/make.html#Environment

: Variables in make can come from the environment in which make
: is run. Every environment variable that make sees when it starts
: up is transformed into a make variable with the same name and
: value.

and most important:

: Thus, by setting the variable CFLAGS in your environment, you
: can cause all C compilations in most makefiles to use the
: compiler switches you prefer. This is safe for variables with
: standard or conventional meanings because you know that no
: makefile will use them for other things. (Note this is not
: totally reliable; some makefiles set CFLAGS explicitly and
: therefore are not affected by the value in the environment.)

ciao
	cate

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