[compiler-rt] [libunwind] [compiler-rt] Allow for CET on OpenBSD (PR #164341)

[Brad Smith via cfe-commits]

https://github.com/brad0 updated https://github.com/llvm/llvm-project/pull/164341

>From 11c525c3b1dbfe554b1d67c766ceab3905dd8d24 Mon Sep 17 00:00:00 2001
From: Brad Smith <brad at comstyle.com>
Date: Mon, 20 Oct 2025 19:49:08 -0400
Subject: [PATCH] [compiler-rt][libunwind] Allow for CET on OpenBSD

---
 compiler-rt/CMakeLists.txt          | 2 +-
 compiler-rt/lib/builtins/assembly.h | 2 +-
 libunwind/src/assembly.h            | 2 +-
 libunwind/src/shadow_stack_unwind.h | 4 ++--
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/compiler-rt/CMakeLists.txt b/compiler-rt/CMakeLists.txt
index 5931b60d0975b..19a06ad1c5d20 100644
--- a/compiler-rt/CMakeLists.txt
+++ b/compiler-rt/CMakeLists.txt
@@ -315,7 +315,7 @@ include(config-ix)
 # Setup Compiler Flags
 #================================
 
-# fcf-protection is a gcc/clang option for CET support on Linux platforms.
+# fcf-protection is a gcc/clang option for CET support on Linux/OpenBSD.
 # We need to handle MSVC CET option on Windows platforms.
 if (NOT MSVC)
   if (COMPILER_RT_ENABLE_CET AND NOT COMPILER_RT_HAS_FCF_PROTECTION_FLAG)
diff --git a/compiler-rt/lib/builtins/assembly.h b/compiler-rt/lib/builtins/assembly.h
index d1e532813aa24..871f9ad2b75d8 100644
--- a/compiler-rt/lib/builtins/assembly.h
+++ b/compiler-rt/lib/builtins/assembly.h
@@ -14,7 +14,7 @@
 #ifndef COMPILERRT_ASSEMBLY_H
 #define COMPILERRT_ASSEMBLY_H
 
-#if defined(__linux__) && defined(__CET__)
+#ifdef __CET__
 #if __has_include(<cet.h>)
 #include <cet.h>
 #endif
diff --git a/libunwind/src/assembly.h b/libunwind/src/assembly.h
index f8e83e138eff5..f0fcd006f2073 100644
--- a/libunwind/src/assembly.h
+++ b/libunwind/src/assembly.h
@@ -15,7 +15,7 @@
 #ifndef UNWIND_ASSEMBLY_H
 #define UNWIND_ASSEMBLY_H
 
-#if defined(__linux__) && defined(__CET__)
+#if defined(__CET__)
 #include <cet.h>
 #define _LIBUNWIND_CET_ENDBR _CET_ENDBR
 #else
diff --git a/libunwind/src/shadow_stack_unwind.h b/libunwind/src/shadow_stack_unwind.h
index 1f229d8317116..554a1ca80ad53 100644
--- a/libunwind/src/shadow_stack_unwind.h
+++ b/libunwind/src/shadow_stack_unwind.h
@@ -12,8 +12,8 @@
 
 #include "libunwind.h"
 
-// Currently, CET is implemented on Linux x86 platforms.
-#if defined(_LIBUNWIND_TARGET_LINUX) && defined(__CET__) && defined(__SHSTK__)
+// Currently, CET is implemented on Linux/OpenBSD x86.
+#if defined(__CET__) && defined(__SHSTK__)
 #define _LIBUNWIND_USE_CET 1
 #endif