Re: [coldfire-gnu-discuss] coldfire-toolchain: "make dep" fails

[Nathan Sidwell <nathan@xxxxxxxxxxxxxxxx>]

Michel Marti wrote:

> I now tried to build 2.6.12-uc0 for the M5271EVB platform using the CodeSourcery
> toolchain, but this fails as well:

> In file included from include/linux/nfs_fs.h:15,
>                  from init/do_mounts.c:11:
> include/linux/pagemap.h: In function 'fault_in_pages_readable':
> include/linux/pagemap.h:236: error: read-only variable '__gu_val' used as 'asm' output
> include/linux/pagemap.h:236: error: read-only variable '__gu_val' used as 'asm' output
> include/linux/pagemap.h:236: error: read-only variable '__gu_val' used as 'asm' output
> include/linux/pagemap.h:236: warning: passing argument 1 of 'memcpy' discards qualifiers
> from pointer target type
> include/linux/pagemap.h:236: error: assignment of read-only variable '__gu_val'
> include/linux/pagemap.h:242: error: read-only variable '__gu_val' used as 'asm' output
> include/linux/pagemap.h:242: error: read-only variable '__gu_val' used as 'asm' output
> include/linux/pagemap.h:242: error: read-only variable '__gu_val' used as 'asm' output
> include/linux/pagemap.h:242: warning: passing argument 1 of 'memcpy' discards qualifiers
> from pointer target type
> include/linux/pagemap.h:242: error: assignment of read-only variable '__gu_val'
> make[1]: *** [init/do_mounts.o] Error 1
> make: *** [init] Error 2
>
> Any further hints?

I'm not sure if you received a reply to this, and I'm just catching up with my 
email.  This problem is a bug with the kernel sources.  GCC 4.1 is stricter in 
verifying const qualifiers on asm outputs.  This case is something like
	const int __gu_val;
	asm ("..." : "=r" (__gu_val) ...);
which is now correctly diagnosed.  (IIRC, actually it's inside a macro and uses 
__typeof__ in the form of '__typeof__(*FOO) __gu_val;' and FOO is a pointer to 
const qualified type.)

The 2.6 kernel sources have been patched (across the several architectures that 
had this problem).

nathan

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