./include/grub/gpt_partition.h:79:1: error: alignment 1 of ‘struct grub_gpt_partentry’ is less than 8 [-Werror=packed-not-aligned]

[Paul Menzel <paulepanter@users.sourceforge.net>]

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Dear GRUB folks,


Building GRUB’s master branch with GCC 8 shows the error below.

```
$ gcc-8 --version | head -1
gcc-8 (Debian 8-20180320-1) 8.0.1 20180320 (experimental) [trunk revision 258670]

$ git log --oneline -1
e2faabacf ieee1275: split up grub_machine_get_bootlocation
$ ./autogen.sh
$ ./configure --with-platform=coreboot --enable-boot-time CC=gcc-8
$ make
[…]
gcc-8 -DHAVE_CONFIG_H -I.  -Wall -W -DGRUB_UTIL=1 -D_FILE_OFFSET_BITS=64 -I./include -DGRUB_FILE=\"grub-core/disk/ldm.c\" -I. -I. -I. -I. -I./include -I./include -I./grub-core/lib/libgcrypt-grub/src/  -I./grub-core/gnulib -I./grub-core/gnulib -D_FILE_OFFSET_BITS=64 -Wall -W -Wshadow -Wpointer-arith -Wundef -Wchar-subscripts -Wcomment -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wfloat-equal -Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wmain -Wmissing-braces -Wmissing-format-attribute -Wmultichar -Wparentheses -Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wtrigraphs -Wunknown-pragmas -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wunused-value  -Wunused-variable -Wwrite-strings -Wnested-externs -Wstrict-prototypes -Wcast-align  -Wextra -Wattributes -Wendif-labels -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmissing-field-initializers -Wnonnull -Woverflow -Wvla -Wpointer-to-int-cast -Wstrict-aliasing -Wvariadic-macros -Wvolatile-register-var -Wpointer-sign -Wmissing-include-dirs -Wmissing-prototypes -Wmissing-declarations -Wformat=2 -Werror  -Wno-undef -Wno-sign-compare -Wno-unused -Wno-unused-parameter -Wno-redundant-decls -Wno-unreachable-code -Wno-conversion  -MT grub-core/disk/libgrubkern_a-ldm.o -MD -MP -MF grub-core/disk/.deps-util/libgrubkern_a-ldm.Tpo -c -o grub-core/disk/libgrubkern_a-ldm.o `test -f 'grub-core/disk/ldm.c' || echo './'`grub-core/disk/ldm.c
In file included from grub-core/disk/ldm.c:26:
./include/grub/gpt_partition.h:79:1: error: alignment 1 of ‘struct grub_gpt_partentry’ is less than 8 [-Werror=packed-not-aligned]
 } GRUB_PACKED;
 ^
```


Thanks,

Paul

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