Re: Linux 2.4.17-pre5 / Have fun with make

[Keith Owens <kaos@ocs.com.au>]

On Fri, 7 Dec 2001 17:39:54 +0100, 
Stephan von Krawczynski <skraw@ithnet.com> wrote:
>On Sat, 08 Dec 2001 00:35:14 +1100
>Keith Owens <kaos@ocs.com.au> wrote:
>> 
>> CFLAGS_foo.o += -DMAX_CARDS=$(subst (,,$(subst ),,$(CONFIG_HISAX_MAX_CARDS)))
>> 
>> In foo.c, use MAX_CARDS instead of CONFIG_HISAX_MAX_CARDS.  Change foo
>> to the name of the object that you are working on.  When you build, it
>> should say -DMAX_CARDS=8.
>
>Keith, it is getting weird right now. Your above suggestion does not work, it
>does not even execute, because the braces obviously confuse it.

That's what I get for typing code late at night and not testing it.
The correct implementation of that line is probably

lp:=(
rp:=)

CFLAGS_foo.o += -DMAX_CARDS=$(subst $(lp),,$(subst $(rp),,$(CONFIG_HISAX_MAX_CARDS)))

But as you found, you don't need that anyway.

>Now I come up with a _working_ solution, but to be honest, I don't dare to give
>away the patch, because it looks like this:
>
>EXTRA_CFLAGS      += -DHISAX_MAX_CARDS=$(subst ,,$(CONFIG_HISAX_MAX_CARDS))

EXTRA_CFLAGS += -DHISAX_MAX_CARDS=$(CONFIG_HISAX_MAX_CARDS)

will work just as well.  The reason that you do not get '(8)' that way
is because CML1 generates inconsistent output.  In .config the line
says CONFIG_HISAX_MAX_CARDS=8, in include/linux/autoconf.h it says
#define CONFIG_HISAX_MAX_CARDS (8).  The makefiles use .config, the
source code uses autoconf.h.

Inconsistency of inconsistencies, saith the preacher; all is inconsistency.