[PATCH v2] gdbserver: Check r_version < 1 for Linux debugger interface

["H.J. Lu via Libc-alpha" <libc-alpha@sourceware.org>]

Update gdbserver to check r_version < 1 instead of r_version != 1 so
that r_version can be bumped for a new field in the glibc debugger
interface to support multiple namespaces.  Since so far, the gdbserver
only reads fields defined for r_version == 1, it is compatible with
r_version >= 1.

All future glibc debugger interface changes will be backward compatible.
If there is ever the need for backward incompatible change to the glibc
debugger interface, a new DT_XXX element will be provided to access the
new incompatible interface.

	PR gdb/11839
	* linux-low.cc (linux_process_target::qxfer_libraries_svr4):
	Check r_version < 1 instead of r_version != 1.
---
 gdbserver/linux-low.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index 5c6191d941c..fc7a995351d 100644
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -6845,7 +6845,7 @@ linux_process_target::qxfer_libraries_svr4 (const char *annex,
 	  if (linux_read_memory (priv->r_debug + lmo->r_version_offset,
 				 (unsigned char *) &r_version,
 				 sizeof (r_version)) != 0
-	      || r_version != 1)
+	      || r_version < 1)
 	    {
 	      warning ("unexpected r_debug version %d", r_version);
 	    }
-- 
2.31.1