We should not assume that the cet.h header exists just because
we're on x86 linux. Only include it if __CET__ is defined. This
makes the code more similar to what compiler-rt does in
https://github.com/llvm/llvm-project/blob/
ee423d93ead39e94c2970b3cc7ef6e6faa75d10b/compiler-rt/lib/builtins/assembly.h#L17
(though that one also has a __has_include() check -- I've not found
that to be necessary).
Differential Revision: https://reviews.llvm.org/D119697
#ifndef UNWIND_ASSEMBLY_H
#define UNWIND_ASSEMBLY_H
-#if (defined(__i386__) || defined(__x86_64__)) && defined(__linux__)
+#if defined(__linux__) && defined(__CET__)
#include <cet.h>
#define _LIBUNWIND_CET_ENDBR _CET_ENDBR
#else