$ ./configure --target=x86_64-w64-mingw32 --with-platform=efi
--host=x86_64-w64-mingw32
$ make
[...]
In file included from grub-core/osdep/platform.c:4:
grub-core/osdep/windows/platform.c: In function ‘grub_install_register_efi’:
grub-core/osdep/windows/platform.c:382:41: error: taking address of packed
member of ‘struct grub_efi_file_path_device_path’ may result in an unaligned
pointer value [-Werror=address-of-packed-member]
382 | path16_len = grub_utf8_to_utf16 (filep->path_name,
| ~~~~~^~~~~~~~~~~
Disable the -Wadress-of-packaed-member diagnostic for grub_utf8_to_utf16()
call which contains filep->path_name reference. It seems safe because the
structure is defined according to the UEFI spec and we hope authors did not
make any mistake... :-)
This fix is similar to the fix in the commit 8e8723a6b
(f2fs: Disable gcc9 -Waddress-of-packed-member).
Signed-off-by: Daniel Kiper <daniel.ki...@oracle.com>
---
grub-core/osdep/windows/platform.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/grub-core/osdep/windows/platform.c
b/grub-core/osdep/windows/platform.c
index 253f8d101..075776d50 100644
--- a/grub-core/osdep/windows/platform.c
+++ b/grub-core/osdep/windows/platform.c
@@ -379,10 +379,20 @@ grub_install_register_efi (grub_device_t efidir_grub_dev,
filep->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE;
filep->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE;
+#if __GNUC__ >= 9
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
+
path16_len = grub_utf8_to_utf16 (filep->path_name,
path8_len * GRUB_MAX_UTF16_PER_UTF8,
(const grub_uint8_t *) efifile_path,
path8_len, 0);
+
+#if __GNUC__ >= 9
+#pragma GCC diagnostic pop
+#endif
+
filep->path_name[path16_len] = 0;
filep->header.length = sizeof (*filep) + (path16_len + 1) * sizeof
(grub_uint16_t);
pathptr = &filep->path_name[path16_len + 1];
--
2.11.0
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