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build failure because of warnings when -O3 is used
Description of problem:
qemu build fails when -O3 is enabled and the build is done either from a git cloned qemu or with -Werror enabled (qemu build enables -Werror automatically when it detects the .git folder)
Steps to reproduce:
1. git clone qemu && install appropriate dependencies for qemu build
2. mkdir build
3. ../configure --extra-cflags="-O3"
4. make -j$(nbproc)
```
cc -m64 -Ilibcommon.a.p -I../common-user/host/x86_64 -I../linux-user/include/host/x86_64 -I../linux-user/include -Isubprojects/libvduse -I../subprojects/libvduse -I/usr/include/p11-kit-1 -I/usr/include/pixman-1 -I/usr/include/libpng16 -I/usr/include/spice-server -I/usr/include/spice-1 -I/usr/include/libusb-1.0 -I/usr/include/SDL2 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/sysprof-6 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/gio-unix-2.0 -I/usr/include/slirp -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/fribidi -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/x86_64-linux-gnu -I/usr/include/webp -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/vte-2.91 -I/usr/include/virgl -I/usr/include/cacard -I/usr/include/nss -I/usr/include/nspr -I/usr/include/PCSC -I/usr/include/pipewire-0.3 -I/usr/include/spa-0.2 -I/usr/include/fuse3 -I/usr/include/uuid -fdiagnostics-color=auto -Wall -Winvalid-pch -Werror -std=gnu11 -O2 -g -fstack-protector-strong -Wempty-body -Wendif-labels -Wexpansion-to-defined -Wformat-security -Wformat-y2k -Wignored-qualifiers -Wimplicit-fallthrough=2 -Winit-self -Wmissing-format-attribute -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls -Wshadow=local -Wstrict-prototypes -Wtype-limits -Wundef -Wvla -Wwrite-strings -Wno-missing-include-dirs -Wno-psabi -Wno-shift-negative-value -isystem /home/ubuntu/qemu/linux-headers -isystem linux-headers -iquote . -iquote /home/ubuntu/qemu -iquote /home/ubuntu/qemu/include -iquote /home/ubuntu/qemu/host/include/x86_64 -iquote /home/ubuntu/qemu/host/include/generic -iquote /home/ubuntu/qemu/tcg/i386 -pthread -mcx16 -msse2 -D_GNU_SOURCE -D_LARGEFILE_SOURCE -fno-strict-aliasing -fno-common -fwrapv -ftrivial-auto-var-init=zero -fzero-call-used-regs=used-gpr -O3 -fPIE -D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64 -D__USE_LARGEFILE64 -DUSE_POSIX_ACLS=1 -isystem /usr/include/mit-krb5 -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -DNCURSES_WIDECHAR=1 -D_REENTRANT -DSTRUCT_IOVEC_DEFINED -MD -MQ libcommon.a.p/hw_ssi_xilinx_spips.c.o -MF libcommon.a.p/hw_ssi_xilinx_spips.c.o.d -o libcommon.a.p/hw_ssi_xilinx_spips.c.o -c ../hw/ssi/xilinx_spips.c
../hw/ssi/xilinx_spips.c: In function ‘xilinx_spips_flush_txfifo’:
../hw/ssi/xilinx_spips.c:624:30: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
624 | tx_rx[i] = fifo8_pop(&s->tx_fifo);
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
../hw/ssi/xilinx_spips.c:613:17: note: at offset 2 into destination object ‘tx_rx’ of size 2
613 | uint8_t tx_rx[MAX_NUM_BUSSES] = { 0 };
| ^~~~~
cc1: all warnings being treated as errors
```
Additional information:
I fixed this warning locally on my build however it is only a start of several build warnings that happen down the road (\~6 warnings in total)
|