[gcc r13-5230] bpf: disable -fstack-protector in BPF

[Jose E. Marchesi <jemarch@gcc.gnu.org>]

https://gcc.gnu.org/g:3b81f5c4d8e0d79cbd6927d004185707c14e54b2

commit r13-5230-g3b81f5c4d8e0d79cbd6927d004185707c14e54b2
Author: Jose E. Marchesi <jose.marchesi@oracle.com>
Date:   Tue Jan 17 17:16:32 2023 +0100

    bpf: disable -fstack-protector in BPF
    
    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.
    
    Regtested in bpf-unknown-none.
    
    gcc/ChangeLog:
    
            * config/bpf/bpf.cc (bpf_option_override): Disable
            -fstack-protector.

Diff:
---
 gcc/config/bpf/bpf.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

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;
+    }
 }
 
 #undef TARGET_OPTION_OVERRIDE