automake: use subdir-objects option

Automake 1.14 introduced several non-fatal warnings that should help
projects prepare to the next major automake release (2.0).

Considering the way OpenOCD automake files are written, using
subdir-objects doesn't have any adverse effects, so enable it for the
future compatibility.

Change-Id: I3e7fd93d1b53c5a7ed00ec0f03d2d1510a07f516
Reported-by: Freddie Chopin <freddie_chopin@op.pl>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/1517
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

diff --git a/configure.ac b/configure.ac
index 18958136837a20494ec57bd6e9491567b801a04e..623e63173073be9b6a7da5af26325f7745954ee9 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@ AC_CONFIG_SRCDIR([src/openocd.c])
 
 m4_include([config_subdir.m4])dnl
 
-AM_INIT_AUTOMAKE([-Wall -Wno-portability dist-bzip2 dist-zip])
+AM_INIT_AUTOMAKE([-Wall -Wno-portability dist-bzip2 dist-zip subdir-objects])
 
 AC_CONFIG_HEADERS([config.h])
 AH_BOTTOM([