Require readline 7 or newer

[external/binutils.git] / gdb / doc / gdb.texinfo

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 89b1eda..523e3d0 100644 (file)
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -24390,6 +24390,14 @@ but the lengths of the @code{z} and @code{p} registers will not change.  This
 is a known limitation of @value{GDBN} and does not affect the execution of the
 target process.
 
+@subsubsection AArch64 Pointer Authentication.
+@cindex AArch64 Pointer Authentication.
+
+When @value{GDBN} is debugging the AArch64 architecture, and the program is
+using the v8.3-A feature Pointer Authentication (PAC), then whenever the link
+register @code{$lr} is pointing to an PAC function its value will be masked.
+When GDB prints a backtrace, any addresses that required unmasking will be
+postfixed with the marker [PAC].
 
 @node i386
 @subsection x86 Architecture-specific Issues
@@ -36897,7 +36905,8 @@ details.
 
 @item --with-system-readline
 Use the readline library installed on the host, rather than the
-library supplied as part of @value{GDBN}.
+library supplied as part of @value{GDBN}.  Readline 7 or newer is
+required; this is enforced by the build system.
 
 @item --with-system-zlib
 Use the zlib library installed on the host, rather than the library