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grub2: fix packed-not-aligned error on GCC 8

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Fix the compile error "packed-not-aligned" when using GCC 8.

Signed-off-by: Edi Turn <yyxstter@gmail.com>
This commit is contained in:
Edi Turn 2018-07-23 22:08:18 +08:00 committed by John Crispin
parent 5647cc7bd4
commit e9dee19487
1 changed files with 71 additions and 0 deletions
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71
package/boot/grub2/patches/0008-Fix-packed-not-aligned-error-on-GCC-8.patch Normal file
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@ -0,0 +1,71 @@
From 563b1da6e6ae7af46cc8354cadb5dab416989f0a Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Mon, 26 Mar 2018 16:52:34 +0800
Subject: Fix packed-not-aligned error on GCC 8
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
When building with GCC 8, there are several errors regarding packed-not-aligned.
./include/grub/gpt_partition.h:79:1: error: alignment 1 of ‘struct grub_gpt_partentry’ is less than 8 [-Werror=packed-not-aligned]
This patch fixes the build error by cleaning up the ambiguity of placing
aligned structure in a packed one. In "struct grub_btrfs_time" and "struct
grub_gpt_part_type", the aligned attribute seems to be superfluous, and also
has to be packed, to ensure the structure is bit-to-bit mapped to the format
laid on disk. I think we could blame to copy and paste error here for the
mistake. In "struct efi_variable", we have to use grub_efi_packed_guid_t, as
the name suggests. :)
Signed-off-by: Michael Chang <mchang@suse.com>
Tested-by: Michael Chang <mchang@suse.com>
Tested-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
grub-core/fs/btrfs.c | 2 +-
include/grub/efiemu/runtime.h | 2 +-
include/grub/gpt_partition.h | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index 4849c1ceb..be195448d 100644
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -175,7 +175,7 @@ struct grub_btrfs_time
{
grub_int64_t sec;
grub_uint32_t nanosec;
-} __attribute__ ((aligned (4)));
+} GRUB_PACKED;
struct grub_btrfs_inode
{
diff --git a/include/grub/efiemu/runtime.h b/include/grub/efiemu/runtime.h
index 9b6b729f4..36d2dedf4 100644
--- a/include/grub/efiemu/runtime.h
+++ b/include/grub/efiemu/runtime.h
@@ -29,7 +29,7 @@ struct grub_efiemu_ptv_rel
struct efi_variable
{
- grub_efi_guid_t guid;
+ grub_efi_packed_guid_t guid;
grub_uint32_t namelen;
grub_uint32_t size;
grub_efi_uint32_t attributes;
diff --git a/include/grub/gpt_partition.h b/include/grub/gpt_partition.h
index 1b32f6725..9668a68c3 100644
--- a/include/grub/gpt_partition.h
+++ b/include/grub/gpt_partition.h
@@ -28,7 +28,7 @@ struct grub_gpt_part_type
grub_uint16_t data2;
grub_uint16_t data3;
grub_uint8_t data4[8];
-} __attribute__ ((aligned(8)));
+} GRUB_PACKED;
typedef struct grub_gpt_part_type grub_gpt_part_type_t;
#define GRUB_GPT_PARTITION_TYPE_EMPTY \
--
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