automake: set test-driver path relative to top_builddir

automake offers auxiliary tools and is capable to install and prepare the setup for those.
test-driver, a log driver used by parallel testsuite harness in ptests, is one of those tools.
By default it looks that automake prepare environment for testing relative $top_srcdir.
But in Yocto following changed:
 - build folder was separated
 - $top_srcdir is not anymore defined as relative path, now can be relative or absolute

So now in Yocto the Makefile from src/tests contains absolute path of $top_srcdir for test-driver
which is an unexisting path at runtime.

We need to have relative path for test-driver in Makefile to work on target. $top_builddir
can guarantee this path.

Originally submitted by Adrian Calianu <adrian.calianu@enea.com>

(From OE-Core rev: e9db0ae11d95f3c375b27d5c10606efd8b568fbf)

Signed-off-by: Martin Borg <martin.borg@enea.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/automake/automake/new_rt_path_for_test-driver.patch

@@ -0,0 +1,36 @@
+Set relative to top_builddir path in Makefile to access test-driver
+
+Signed-off-by: Adrian Calianu <adrian.calianu@enea.com>
+Upstream-Status: Pending
+Bug-Report: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19042
+
+--- a/bin/automake.in
++++ b/bin/automake.in
+@@ -272,6 +272,9 @@
+ # $AM_CONFIG_AUX_DIR is prefixed with $(top_srcdir), so it can be used
+ # in Makefiles.
+ my $am_config_aux_dir = '';
++# Directory used at runtime like running test-driver that should not
++# depend on $(top_srcdir)
++my $am_config_rt_aux_dir = '';
+
+ # Directory to search for AC_LIBSOURCE files, as set by AC_CONFIG_LIBOBJ_DIR
+ # in configure.ac.
+@@ -4700,7 +4703,7 @@
+     {
+       require_conf_file ("parallel-tests", FOREIGN, 'test-driver');
+       define_variable ("${pfx}LOG_DRIVER",
+-                       "\$(SHELL) $am_config_aux_dir/test-driver",
++                       "\$(SHELL) $am_config_rt_aux_dir/test-driver",
+                        INTERNAL);
+     }
+   my $driver = '$(' . $pfx . 'LOG_DRIVER)';
+@@ -7284,6 +7287,10 @@
+   $am_config_aux_dir =
+     '$(top_srcdir)' . ($config_aux_dir eq '.' ? "" : "/$config_aux_dir");
+   $am_config_aux_dir =~ s,/*$,,;
++
++  $am_config_rt_aux_dir =
++    '$(top_builddir)' . ($config_aux_dir eq '.' ? "" : "/$config_aux_dir");
++  $am_config_rt_aux_dir =~ s,/*$,,;
+ }

meta/recipes-devtools/automake/automake_1.15.bb

@@ -21,7 +21,8 @@ RDEPENDS_${PN}_class-native = "autoconf-native hostperl-runtime-native"
 SRC_URI += " file://python-libdir.patch \
             file://py-compile-compile-only-optimized-byte-code.patch \
             file://buildtest.patch \
-            file://performance.patch"
+            file://performance.patch \
+            file://new_rt_path_for_test-driver.patch"
 
 SRC_URI[md5sum] = "716946a105ca228ab545fc37a70df3a3"
 SRC_URI[sha256sum] = "7946e945a96e28152ba5a6beb0625ca715c6e32ac55f2e353ef54def0c8ed924"