the reason for failure is gcc 4.7 on fedora 17

After fixing the -melf_i386 issue, a new error is thrown:

| make[3]: Entering directory `/home/nitin/builds/build0/tmp/work/x86_64-linux/grub-efi-i586-native-1.99-r7/grub-1.99/grub-core'
| gcc -DHAVE_CONFIG_H -I. -I..  -Wall -W -I../include -I../include  -DGRUB_MACHINE_EFI=1 -DGRUB_MACHINE=I386_EFI -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.7.0/include -DGRUB_FILE=\"fs/btrfs.c\" -I. -I. -I.. -I.. -I../include -I../include    -isystem/home/nitin/builds/build0/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -g -feliminate-unused-debug-types -Wall -W -Wshadow -Wpointer-arith -Wmissing-prototypes -Wundef -Wstrict-prototypes -g -falign-jumps=1 -falign-loops=1 -falign-functions=1 -mno-mmx -mno-sse -mno-sse2 -mno-3dnow -fno-dwarf2-cfi-asm -m32 -fno-stack-protector -mno-stack-arg-probe -Werror -Wno-trampolines          -ffreestanding  -isystem/home/nitin/builds/build0/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -c -o fs/btrfs_module-btrfs.o `test -f 'fs/btrfs.c' || echo './'`fs/btrfs.c
| fs/btrfs.c: In function 'grub_btrfs_read_logical':
| fs/btrfs.c:791:5: error: 'err' may be used uninitialized in this function [-Werror=maybe-uninitialized]
| fs/btrfs.c:592:18: note: 'err' was declared here
| cc1: all warnings being treated as errors
| make[3]: *** [fs/btrfs_module-btrfs.o] Error 1

after fixing the uninitialized error, seeing these errors now

| gcc -DHAVE_CONFIG_H -I. -I..  -Wall -W -I../include -I../include  -DGRUB_MACHINE_EFI=1 -DGRUB_MACHINE=I386_EFI -no
stdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.7.0/include -DGRUB_FILE=\"fs/zfs/zfs.c\" -I. -I. -I.. -I.. -I../i
nclude -I../include    -isystem/home/nitin/builds/build0/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -g -felimin
ate-unused-debug-types -Wall -W -Wshadow -Wpointer-arith -Wmissing-prototypes -Wundef -Wstrict-prototypes -g -falign
-jumps=1 -falign-loops=1 -falign-functions=1 -mno-mmx -mno-sse -mno-sse2 -mno-3dnow -fno-dwarf2-cfi-asm -m32 -fno-st
ack-protector -mno-stack-arg-probe -Werror -Wno-trampolines          -ffreestanding  -isystem/home/nitin/builds/buil
d0/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -c -o fs/zfs/zfs_module-zfs.o `test -f 'fs/zfs/zfs.c' || echo './
'`fs/zfs/zfs.c
| fs/zfs/zfs.c: In function 'get_filesystem_dnode':
| fs/zfs/zfs.c:1449:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-ali
asing]
| fs/zfs/zfs.c:1449:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-ali
asing]
| fs/zfs/zfs.c: In function 'make_mdn':
| fs/zfs/zfs.c:1478:3: error: dereferencing type-punned pointer will break strict-alERROR: Function failed: do_compile (see /home/nitin/builds/build0/tmp/work/x86_64-linux/grub-efi-i586-native-1.99-r7/temp/log.do_compile.16197 for further information)
| iasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c: In function 'dnode_get_fullpath':
| fs/zfs/zfs.c:1554:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:1554:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:1571:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:1571:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c: In function 'grub_zfs_open':
| fs/zfs/zfs.c:2234:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2234:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c: In function 'fill_fs_info':
| fs/zfs/zfs.c:2362:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2362:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2395:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2395:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c: In function 'iterate_zap':
| fs/zfs/zfs.c:2420:5: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2420:5: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c: In function 'grub_zfs_dir':
| fs/zfs/zfs.c:2483:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2483:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2484:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2484:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2502:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| fs/zfs/zfs.c:2502:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
| cc1: all warnings being treated as errors

I have fix for all the errors now, will send out the commit to ML soon.

fixed by this commit in the master
commit 3d23afdc7a7f79ebdb324fd97d45420ca62dd869
Author: Nitin A Kamble <nitin.a.kamble@intel.com>
Date:   Sat Apr 14 01:59:07 2012 -0700

    grub-efi-native, grub: fix build with gcc 4.7

    This fixes bug [YOCTO #2293]

    These build failure caused by gcc4.7 is fixed with a backport of a
    grub-1.99 patch from fedora 17 alpha plus two more new patches