On 12/01/2022 19:50, Jan Kiszka wrote:
On 12.01.22 14:54, Ralf Ramsauer wrote:
On 12/01/2022 07:56, Peng Fan (OSS) wrote:
From: Peng Fan <[email protected]>
With gcc 5.15, met the following error
hypervisor/arch/arm64/control.c:33:9:
error: ‘memset’ offset [0, 255] is out of the bounds [0, 0]
[-Werror=array-bounds]
33 | memset(&this_cpu_data()->guest_regs, 0, sizeof(union
registers));
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I see the same error on gcc-11.1.
My local workaround is to add -ffreestanding to hypervisor/Makefile,
as this avoids builtin gcc-magic such as undesired inlining of memsets
with constant size.
We already use -ffreestanding for inmates, and I guess we should do it
for the hypervisor as well.
The kernel uses -ffreestanding at least for its (generic) string
functions. So for us maybe
CFLAGS_lib.o := -freestanding
Which only helps against odd optimisation /within/ that compilation
unit. It will not affect users of exported standard string routines.
Ralf
Jan
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