These 3 new build warnings showed up when I upgraded one of my devices to Fedora 30.
They are all in the Android subtree.
$ gcc --version
gcc (GCC) 9.1.1 20190503 (Red Hat 9.1.1-1)
$ uname -a
Linux bgix-nuc-1.sea.intel.com 5.0.11-300.fc30.x86_64 #1 SMP Thu May 2 14:11:38 UTC 2019 x86_64 x86_64 x86_64
GNU/Linux
$ make -k
make --no-print-directory all-am
CC android/avrcp-lib.o
android/avrcp-lib.c: In function ‘get_element_attributes’:
android/avrcp-lib.c:967:27: error: taking address of packed member of ‘struct get_element_attributes_req’ may
result in an unaligned pointer value [-Werror=address-of-packed-member]
967 | if (!parse_attributes(req->attrs, params_len - sizeof(*req),
| ~~~^~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [Makefile:6578: android/avrcp-lib.o] Error 1
CC android/handsfree.o
android/handsfree.c: In function ‘bt_sco_get_fd’:
android/handsfree.c:2913:47: error: taking address of packed member of ‘struct sco_rsp_get_fd’ may result in an
unaligned pointer value [-Werror=address-of-packed-member]
2913 | if (!dev || !bt_sco_get_fd_and_mtu(sco, &fd, &rsp.mtu))
| ^~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [Makefile:6578: android/handsfree.o] Error 1
CC android/bluetooth_default_la-hal-bluetooth.lo
android/hal-bluetooth.c: In function ‘set_adapter_property’:
android/hal-bluetooth.c:659:46: error: taking address of packed member of ‘struct hal_cmd_set_adapter_prop’ may
result in an unaligned pointer value [-Werror=address-of-packed-member]
659 | adapter_prop_from_hal(property, &cmd->type, &cmd->len, cmd->val);
| ^~~~~~~~~
cc1: all warnings being treated as errors
make[1]: *** [Makefile:6637: android/bluetooth_default_la-hal-bluetooth.lo] Error 1
make[1]: Target 'all-am' not remade because of errors.
make: *** [Makefile:3872: all] Error 2
