Dear SeaBIOS folks,
Building SeaBIOS with GCC 8, the warnings below are shown.
```
$ gcc-8 --version
gcc-8 (Debian 8-20180218-1) 8.0.1 20180218 (experimental) [trunk revision 257787]
[…]
$ git log --oneline -1
5adc8bd (HEAD -> master, origin/master, origin/HEAD) tpm: Handle unimplemented TIS_REG_IFACE_ID in tis_get_tpm_version()
$ make CC=gcc-8
scripts/kconfig/conf --olddefconfig /dev/shm/seabios2/src/Kconfig
#
# configuration written to /dev/shm/seabios2/.config
#
Build Kconfig config file
Compile checking out/src/misc.o
Compile checking out/src/stacks.o
Compile checking out/src/output.o
Compile checking out/src/string.o
Compile checking out/src/block.o
Compile checking out/src/cdrom.o
Compile checking out/src/disk.o
Compile checking out/src/mouse.o
Compile checking out/src/kbd.o
Compile checking out/src/system.o
Compile checking out/src/serial.o
Compile checking out/src/sercon.o
Compile checking out/src/clock.o
Compile checking out/src/resume.o
Compile checking out/src/pnpbios.o
Compile checking out/src/vgahooks.o
Compile checking out/src/pcibios.o
Compile checking out/src/apm.o
Compile checking out/src/cp437.o
Compile checking out/src/hw/pci.o
Compile checking out/src/hw/timer.o
Compile checking out/src/hw/rtc.o
Compile checking out/src/hw/dma.o
Compile checking out/src/hw/pic.o
Compile checking out/src/hw/ps2port.o
Compile checking out/src/hw/serialio.o
Compile checking out/src/hw/usb.o
Compile checking out/src/hw/usb-uhci.o
Compile checking out/src/hw/usb-ohci.o
Compile checking out/src/hw/usb-ehci.o
Compile checking out/src/hw/usb-hid.o
Compile checking out/src/hw/usb-msc.o
Compile checking out/src/hw/usb-uas.o
Compile checking out/src/hw/blockcmd.o
Compile checking out/src/hw/floppy.o
Compile checking out/src/hw/ata.o
Compile checking out/src/hw/ramdisk.o
Compile checking out/src/hw/lsi-scsi.o
Compile checking out/src/hw/esp-scsi.o
Compile checking out/src/hw/megasas.o
Compile checking out/src/hw/mpt-scsi.o
Compile checking out/src/post.o
Compile checking out/src/e820map.o
Compile checking out/src/malloc.o
Compile checking out/src/romfile.o
Compile checking out/src/x86.o
Compile checking out/src/optionroms.o
Compile checking out/src/pmm.o
Compile checking out/src/font.o
Compile checking out/src/boot.o
Compile checking out/src/bootsplash.o
Compile checking out/src/jpeg.o
Compile checking out/src/bmp.o
Compile checking out/src/tcgbios.o
Compile checking out/src/sha1.o
Compile checking out/src/hw/pcidevice.o
Compile checking out/src/hw/ahci.o
Compile checking out/src/hw/pvscsi.o
Compile checking out/src/hw/usb-xhci.o
Compile checking out/src/hw/usb-hub.o
Compile checking out/src/hw/sdcard.o
Compile checking out/src/fw/coreboot.o
Compile checking out/src/fw/lzmadecode.o
Compile checking out/src/fw/multiboot.o
Compile checking out/src/fw/csm.o
Compile checking out/src/fw/biostables.o
Compile checking out/src/fw/paravirt.o
Compile checking out/src/fw/shadow.o
In file included from src/fw/shadow.c:17:
src/fw/shadow.c: In function 'qemu_reboot':
src/string.h:23:16: warning: '__builtin_memcpy' offset -1048576 is out of the bounds [0, 1] of object 'code32flat_start' with type 'char' [-Warray-bounds]
#define memcpy __builtin_memcpy
src/fw/shadow.c:190:9: note: in expansion of macro 'memcpy'
memcpy(cstart, cstart + BIOS_SRC_OFFSET, hrp - cstart);
^~~~~~
In file included from src/biosvar.h:11,
from src/fw/paravirt.h:5,
from src/fw/shadow.c:16:
src/fw/shadow.c:176:28: note: 'code32flat_start' declared here
void *cstart = VSYMBOL(code32flat_start), *cend = VSYMBOL(code32flat_end);
^~~~~~~~~~~~~~~~
src/memmap.h:18:36: note: in definition of macro 'SYMBOL'
#define SYMBOL(SYM) ({ extern char SYM; (u32)&SYM; })
^~~
src/fw/shadow.c:176:20: note: in expansion of macro 'VSYMBOL'
void *cstart = VSYMBOL(code32flat_start), *cend = VSYMBOL(code32flat_end);
^~~~~~~
In file included from src/fw/shadow.c:17:
src/string.h:23:16: warning: '__builtin_memcpy' offset -1048572 is out of the bounds [0, 4] of object 'HaveRunPost' with type 'int' [-Warray-bounds]
#define memcpy __builtin_memcpy
src/fw/shadow.c:191:9: note: in expansion of macro 'memcpy'
memcpy(hrp + 4, hrp + 4 + BIOS_SRC_OFFSET, cend - (hrp + 4));
^~~~~~
In file included from src/fw/shadow.c:18:
src/util.h:193:12: note: 'HaveRunPost' declared here
extern int HaveRunPost;
^~~~~~~~~~~
Compile checking out/src/fw/pciinit.o
Compile checking out/src/fw/smm.o
Compile checking out/src/fw/smp.o
Compile checking out/src/fw/mtrr.o
Compile checking out/src/fw/xen.o
Compile checking out/src/fw/acpi.o
Compile checking out/src/fw/mptable.o
Compile checking out/src/fw/pirtable.o
Compile checking out/src/fw/smbios.o
Compile checking out/src/fw/romfile_loader.o
Compile checking out/src/hw/virtio-ring.o
Compile checking out/src/hw/virtio-pci.o
Compile checking out/src/hw/virtio-blk.o
Compile checking out/src/hw/virtio-scsi.o
Compile checking out/src/hw/tpm_drivers.o
Compile checking out/src/hw/nvme.o
Compiling whole program out/ccode32flat.o
In file included from out/ccode32flat.o.tmp.c:4:
In function 'qemu_reboot',
inlined from 'tryReboot' at ./src/resume.c:129:5,
inlined from 'handle_resume32' at ./src/resume.c:156:5:
./src/string.c:156:16: warning: '__builtin_memcpy' offset -1048576 is out of the bounds [0, 1] of object 'code32flat_start' with type 'char' [-Warray-bounds]
#define memcpy __builtin_memcpy
./src/fw/shadow.c:190:9: note: in expansion of macro 'memcpy'
memcpy(cstart, cstart + BIOS_SRC_OFFSET, hrp - cstart);
^~~~~~
In file included from ./src/biosvar.h:11,
from ./src/misc.c:8,
from out/ccode32flat.o.tmp.c:1:
./src/resume.c: In function 'handle_resume32':
./src/fw/shadow.c:176:28: note: 'code32flat_start' declared here
void *cstart = VSYMBOL(code32flat_start), *cend = VSYMBOL(code32flat_end);
^~~~~~~~~~~~~~~~
./src/memmap.h:18:36: note: in definition of macro 'SYMBOL'
#define SYMBOL(SYM) ({ extern char SYM; (u32)&SYM; })
^~~
./src/fw/shadow.c:176:20: note: in expansion of macro 'VSYMBOL'
void *cstart = VSYMBOL(code32flat_start), *cend = VSYMBOL(code32flat_end);
^~~~~~~
In file included from out/ccode32flat.o.tmp.c:4:
In function 'qemu_reboot',
inlined from 'tryReboot' at ./src/resume.c:129:5,
inlined from 'handle_resume32' at ./src/resume.c:156:5:
./src/string.c:156:16: warning: '__builtin_memcpy' offset -1048572 is out of the bounds [0, 4] of object 'HaveRunPost' with type 'int' [-Warray-bounds]
#define memcpy __builtin_memcpy
./src/fw/shadow.c:191:9: note: in expansion of macro 'memcpy'
memcpy(hrp + 4, hrp + 4 + BIOS_SRC_OFFSET, cend - (hrp + 4));
^~~~~~
In file included from ./src/stacks.c:17,
from out/ccode32flat.o.tmp.c:2:
./src/resume.c: In function 'handle_resume32':
./src/util.h:193:12: note: 'HaveRunPost' declared here
extern int HaveRunPost;
^~~~~~~~~~~
Compiling whole program out/code32seg.o
Compiling whole program out/ccode16.o
Compiling to assembler out/src/asm-offsets.s
Generating offset file out/asm-offsets.h
Compiling (16bit) out/romlayout.o
Building ld scripts
Version: rel-1.11.0-25-g5adc8bd
Fixed space: 0xe05b-0x10000 total: 8101 slack: 12 Percent slack: 0.1%
16bit size: 37920
32bit segmented size: 2198
32bit flat size: 38890
32bit flat init size: 80416
Lowmem size: 2240
f-segment var size: 1248
Linking out/rom16.o
Stripping out/rom16.strip.o
Linking out/rom32seg.o
Stripping out/rom32seg.strip.o
Linking out/rom.o
Prepping out/bios.bin.prep
Total size: 168448 Fixed: 80256 Free: 93696 (used 64.3% of 256KiB rom)
Creating out/bios.bin
```
Thanks,
Paul
