On Tue, 2023-01-17 17:25:08 +0100, Jose E. Marchesi via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
> The stack protector is not supported in BPF. This patch disables
> -fstack-protector in bpf-* targets, along with the emission of a note
> indicating that the feature is not supported in this platform.
[...]
> diff --git a/gcc/config/bpf/bpf.cc b/gcc/config/bpf/bpf.cc
> index 576a1fe8eab..b268801d00c 100644
> --- a/gcc/config/bpf/bpf.cc
> +++ b/gcc/config/bpf/bpf.cc
> @@ -253,6 +253,14 @@ bpf_option_override (void)
> if (bpf_has_jmp32 == -1)
> bpf_has_jmp32 = (bpf_isa >= ISA_V3);
>
> + /* Disable -fstack-protector as it is not supported in BPF. */
> + if (flag_stack_protect)
> + {
> + inform (input_location,
> + "%<-fstack-protector%> does not work "
> + " on this architecture");
> + flag_stack_protect = 0;
> + }
Building with a recent GCC with (noticed during a -Werror build), this
results in a new warning:
[all 2023-01-27 16:26:25] ../../gcc/gcc/config/bpf/bpf.cc: In function 'void
bpf_option_override()':
[all 2023-01-27 16:26:25] ../../gcc/gcc/config/bpf/bpf.cc:260:51: error:
unquoted sequence of 2 consecutive space characters in format
[-Werror=format-diag]
[all 2023-01-27 16:26:25] 260 | "%<-fstack-protector%> does not
work "
[all 2023-01-27 16:26:25] |
^~
[all 2023-01-27 16:26:25] 261 | " on this architecture");
[all 2023-01-27 16:26:25] | ~~
[all 2023-01-27 16:26:27] cc1plus: all warnings being treated as errors
MfG, JBG
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