git: 43e8849bc294 - main - conf: Enable BTI checking in the arm64 kernel

The branch main has been updated by andrew:

URL: https://cgit.FreeBSD.org/src/commit/?id=43e8849bc29414036ccaef7788de95a07ad32ab5

commit 43e8849bc29414036ccaef7788de95a07ad32ab5
Author:     Andrew Turner <andrew@FreeBSD.org>
AuthorDate: 2024-08-19 12:59:49 +0000
Commit:     Andrew Turner <andrew@FreeBSD.org>
CommitDate: 2024-08-20 08:49:15 +0000

    conf: Enable BTI checking in the arm64 kernel
    
    To ensure new code has BTI support make it an error to not have the
    BTI ELF note when linking the kernel and kernel modules.
    
    Reviewed by:    kib, emaste
    Sponsored by:   Arm Ltd
    Differential Revision:  https://reviews.freebsd.org/D45469
---
 sys/conf/kern.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index 93187d93ac63..079bd1173fad 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -143,6 +143,9 @@ CFLAGS += -mgeneral-regs-only
 CFLAGS += -ffixed-x18
 # Build with BTI+PAC
 CFLAGS += -mbranch-protection=standard
+.if ${LINKER_TYPE} == "lld"
+LDFLAGS += -Wl,-zbti-report=error
+.endif
 # TODO: support outline atomics
 CFLAGS += -mno-outline-atomics
 INLINE_LIMIT?=	8000