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

| 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=\"commands/efi/acpi.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 commands/efi/acpi_module-acpi.o `test -f
'commands/efi/acpi.c' || echo './'`commands/efi/acpi.c
| gcc: error: unrecognized command line option '-melf_i386'
| make[3]: *** [trig.module] Error 1

| 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

| 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/zfs/zfs.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/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-aliasing]
| fs/zfs/zfs.c:1449:7: error: dereferencing type-punned pointer will
break strict-aliasing rules [-Werror=strict-aliasing]
| 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.9293
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
| make[3]: *** [fs/zfs/zfs_module-zfs.o] Error 1

(From OE-Core rev: b0f6dc60c926c2a653485e0016fbdc2ac5eb0cb4)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/grub-1.99-gcc-4.7.0-uninitialized-var-errors.patch b/meta/recipes-bsp/grub/files/grub-1.99-gcc-4.7.0-uninitialized-var-errors.patch
new file mode 100644
index 0000000000..397d11f452
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/grub-1.99-gcc-4.7.0-uninitialized-var-errors.patch
@@ -0,0 +1,41 @@
+UpstreamStatus: Pending
+
+This patch quitens this error:
+
+| 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
+
+Signed-Off-By: Nitin A Kamble <nitin.a.kamble@intel.com>
+2012/04/13
+Index: grub-1.99/grub-core/fs/btrfs.c
+===================================================================
+--- grub-1.99.orig/grub-core/fs/btrfs.c
++++ grub-1.99/grub-core/fs/btrfs.c
+@@ -589,7 +589,7 @@ grub_btrfs_read_logical (struct grub_btr
+       struct grub_btrfs_key *key;
+       struct grub_btrfs_chunk_item *chunk;  
+       grub_uint64_t csize;
+-      grub_err_t err; 
++      grub_err_t err = 0; 
+       struct grub_btrfs_key key_out;
+       int challoc = 0;
+       grub_device_t dev;