[PATCH 1/3] Don't compile x86 debug register support on OpenBSD.

[John Baldwin <jhb@FreeBSD.org>]

- Change x86bsd_nat_target to only inherit from x86_nat_target if
  PT_GETDBREGS is supported.

- Don't include x86-nat.o and nat/x86-dregs.o for OpenBSD/amd64.  They
  were already omitted for OpenBSD/i386.
---
 gdb/configure.nat | 5 ++---
 gdb/x86-bsd-nat.h | 9 +++++++--
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/gdb/configure.nat b/gdb/configure.nat
index e34cccffd9..655c75dd1a 100644
--- a/gdb/configure.nat
+++ b/gdb/configure.nat
@@ -451,9 +451,8 @@ case ${gdb_host} in
 	case ${gdb_host_cpu} in
 	    i386)
 		# Host: OpenBSD/amd64
-		NATDEPFILES="${NATDEPFILES} obsd-nat.o amd64-nat.o x86-nat.o \
-		x86-bsd-nat.o amd64-bsd-nat.o amd64-obsd-nat.o bsd-kvm.o \
-		nat/x86-dregs.o"
+		NATDEPFILES="${NATDEPFILES} obsd-nat.o amd64-nat.o \
+		x86-bsd-nat.o amd64-bsd-nat.o amd64-obsd-nat.o bsd-kvm.o"
 		LOADLIBES='-lkvm'
 		;;
 	    mips)
diff --git a/gdb/x86-bsd-nat.h b/gdb/x86-bsd-nat.h
index 02d61c20b0..caf62e38df 100644
--- a/gdb/x86-bsd-nat.h
+++ b/gdb/x86-bsd-nat.h
@@ -27,18 +27,23 @@ extern size_t x86bsd_xsave_len;
 
 /* A prototype *BSD/x86 target.  */
 
+#ifdef HAVE_PT_GETDBREGS
 template<typename BaseTarget>
 class x86bsd_nat_target : public x86_nat_target<BaseTarget>
 {
   using base_class = x86_nat_target<BaseTarget>;
 public:
-#ifdef HAVE_PT_GETDBREGS
   void mourn_inferior () override
   {
     x86_cleanup_dregs ();
     base_class::mourn_inferior ();
   }
+};
+#else /* !HAVE_PT_GETDBREGS */
+template<typename BaseTarget>
+class x86bsd_nat_target : public BaseTarget
+{
+};
 #endif /* HAVE_PT_GETDBREGS */
-};
 
 #endif /* x86-bsd-nat.h */
-- 
2.31.1