From 98a17ece013cb94cd602496b9efb92b8816b3953 Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Sun, 28 Oct 2018 20:14:24 +0100
Subject: [PATCH] GDB: Only build for "unix:" connections if AF_LOCAL is
 supported.

Commit f19c7ff839d7a32ebb48482ae7d318fb46ca823d added a new member to the
prefixes array which included a use of the symbol AF_LOCAL.   Unfortunately,
not all systems declare this symbol.    This change only compiles the "unix:"
member if the system knows about AF_LOCAL.

gdb/ChangeLog:

* configure.ac: New test HAVE_AF_LOCAL
* common/netstuff.c (parse_connection_spec) [prefixes]: Only compile "unix:"
   if HAVE_AF_LOCAL is true.
* configure: regenerate.
* config.in: regenerate.
---
 gdb/ChangeLog         |  8 ++++++++
 gdb/common/netstuff.c |  2 ++
 gdb/config.in         |  3 +++
 gdb/configure         | 21 +++++++++++++++++++++
 gdb/configure.ac      | 10 ++++++++++
 5 files changed, 44 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6742fad014..2d89f83111 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2018-10-29   John Darrington <john@darrington.wattle.id.au>
+
+	* configure.ac: New test HAVE_AF_LOCAL
+	* common/netstuff.c (parse_connection_spec) [prefixes]: Only compile "unix:"
+	if HAVE_AF_LOCAL is true.
+	* configure: regenerate.
+	* config.in: regenerate.
+
 2018-10-28  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* riscv-linux-nat.c (riscv_linux_nat_target::fetch_registers):
diff --git a/gdb/common/netstuff.c b/gdb/common/netstuff.c
index 11182c1e87..56bcdfca72 100644
--- a/gdb/common/netstuff.c
+++ b/gdb/common/netstuff.c
@@ -145,7 +145,9 @@ parse_connection_spec (const char *spec, struct addrinfo *hint)
       { "tcp4:", AF_INET,   SOCK_STREAM },
       { "udp6:", AF_INET6,  SOCK_DGRAM },
       { "tcp6:", AF_INET6,  SOCK_STREAM },
+#if HAVE_AF_LOCAL
       { "unix:", AF_LOCAL,  SOCK_STREAM },
+#endif
     };
 
   for (const host_prefix prefix : prefixes)
diff --git a/gdb/config.in b/gdb/config.in
index f0d1414352..a9d7edc209 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -68,6 +68,9 @@
 /* Define if self-testing features should be enabled */
 #undef GDB_SELF_TEST
 
+/* Define to 1 if AF_LOCAL is defined or declared by sys/socket.h. */
+#undef HAVE_AF_LOCAL
+
 /* Define to 1 if you have `alloca', as a function or macro. */
 #undef HAVE_ALLOCA
 
diff --git a/gdb/configure b/gdb/configure
index 3652455322..a2e7f026f3 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -13997,6 +13997,27 @@ _ACEOF
 fi
 
 
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#include <sys/socket.h>
+
+int
+main ()
+{
+int x = AF_LOCAL
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+$as_echo "#define HAVE_AF_LOCAL 1" >>confdefs.h
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
 if test "$cross_compiling" = no; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether setpgrp takes no argument" >&5
 $as_echo_n "checking whether setpgrp takes no argument... " >&6; }
diff --git a/gdb/configure.ac b/gdb/configure.ac
index b2343a90e5..7d5e027ada 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -1366,6 +1366,16 @@ GDB_AC_COMMON
 # Check the return and argument types of ptrace.
 GDB_AC_PTRACE
 
+dnl Check to see if sys/socket.h knows about AF_LOCAL
+AC_COMPILE_IFELSE(
+     [AC_LANG_PROGRAM([[
+#include <sys/socket.h>
+]],
+	 [[int x = AF_LOCAL]])],
+[AC_DEFINE([HAVE_AF_LOCAL], [1],
+     [Define to 1 if AF_LOCAL is defined or declared by sys/socket.h.])])
+
+
 dnl AC_FUNC_SETPGRP does not work when cross compiling
 dnl Instead, assume we will have a prototype for setpgrp if cross compiling.
 if test "$cross_compiling" = no; then
-- 
2.34.1