x86: Document -fcf-protection requires i686 or newer

	PR target/98667
	* doc/invoke.texi: Document -fcf-protection requires i686 or
	new.

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index c66a25fcd692e67196394fd4535771c8af19f96c..71992b8c59749f5508a3c6a1b1792910652eac57 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -15542,7 +15542,8 @@ which functions and calls should be skipped from instrumentation
 (@pxref{Function Attributes}).
 
 Currently the x86 GNU/Linux target provides an implementation based
-on Intel Control-flow Enforcement Technology (CET).
+on Intel Control-flow Enforcement Technology (CET) which works for
+i686 processor or newer.
 
 @item -fstack-protector
 @opindex fstack-protector