Re: GCC 3.4 Heads-up

[Rusty Russell <rusty@rustcorp.com.au>]

On Thu, 25 Dec 2003 20:46:48 -0500
Chris Meadors <clubneon@hereintown.net> wrote:

> I know it isn't the recommended compiler, heck it isn't even released
> yet, but I was messing around with a GCC 3.4 snapshot, and figured I'd
> give compiling the 2.6.0 kernel a shot.
> 
> Other than the constant barrage of warnings about the use of compound
> expressions as lvalues being deprecated* (mostly because of lines 114,
> 116, and 117 of rcupdate.h, which is included everywhere), the build
> goes very well.

Thanks, downloaded this and tried it.  It's complaining about:

#define per_cpu(var, cpu)			((void)cpu, per_cpu__##var)

There are several ways of fixing this, but the simplest is:

#define per_cpu(var, cpu)			(*((void)cpu, &per_cpu__##var))

Cheers,
Rusty.
-- 
   there are those who do and those who hang on and you don't see too
   many doers quoting their contemporaries.  -- Larry McVoy

diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.6.0/include/asm-generic/percpu.h working-2.6.0-new-gcc/include/asm-generic/percpu.h
--- linux-2.6.0/include/asm-generic/percpu.h	2003-09-22 10:26:12.000000000 +1000
+++ working-2.6.0-new-gcc/include/asm-generic/percpu.h	2003-12-30 12:35:20.000000000 +1100
@@ -29,7 +29,7 @@ do {								\
 #define DEFINE_PER_CPU(type, name) \
     __typeof__(type) per_cpu__##name
 
-#define per_cpu(var, cpu)			((void)cpu, per_cpu__##var)
+#define per_cpu(var, cpu)			(*((void)cpu, &per_cpu__##var))
 #define __get_cpu_var(var)			per_cpu__##var
 
 #endif	/* SMP */