From 721f75ff7de467717658d2de9c20bbb18145790a Mon Sep 17 00:00:00 2001 From: Michael Chang Date: Mon, 26 Mar 2018 16:52:34 +0800 Subject: Fix packed-not-aligned error on GCC 8 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 tries to fix 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 Tested-by: Michael Chang --- 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 \ -- 2.13.6