tests/vm: Use make's --output-sync option

Use make's --output-sync option when running tests inside VMs,
so that if we're building with parallelization the output doesn't
get scrambled.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <20180803085230.30574-6-peter.maydell@linaro.org>
Signed-off-by: NFam Zheng <famz@redhat.com>

tests/vm/freebsd

@@ -23,8 +23,8 @@ class FreeBSDVM(basevm.BaseVM):
         cd $(mktemp -d /var/tmp/qemu-test.XXXXXX);
         tar -xf /dev/vtbd1;
         ./configure {configure_opts};
-        gmake -j{jobs} {verbose};
-        gmake -j{jobs} check {verbose};
+        gmake --output-sync -j{jobs} {verbose};
+        gmake --output-sync -j{jobs} check {verbose};
     """
 
     def build_image(self, img):

tests/vm/netbsd

@@ -23,8 +23,8 @@ class NetBSDVM(basevm.BaseVM):
         cd $(mktemp -d /var/tmp/qemu-test.XXXXXX);
         tar -xf /dev/rld1a;
         ./configure --python=python2.7 {configure_opts};
-        gmake -j{jobs} {verbose};
-        gmake -j{jobs} check {verbose};
+        gmake --output-sync -j{jobs} {verbose};
+        gmake --output-sync -j{jobs} check {verbose};
     """
 
     def build_image(self, img):

tests/vm/openbsd

@@ -23,9 +23,9 @@ class OpenBSDVM(basevm.BaseVM):
         cd $(mktemp -d /var/tmp/qemu-test.XXXXXX);
         tar -xf /dev/rsd1c;
         ./configure --cc=x86_64-unknown-openbsd6.1-gcc-4.9.4 --python=python2.7 {configure_opts};
-        gmake -j{jobs} {verbose};
+        gmake --output-sync -j{jobs} {verbose};
         # XXX: "gmake check" seems to always hang or fail
-        #gmake -j{jobs} check {verbose};
+        #gmake --output-sync -j{jobs} check {verbose};
     """
 
     def build_image(self, img):

tests/vm/ubuntu.i386

@@ -25,8 +25,8 @@ class UbuntuX86VM(basevm.BaseVM):
         sudo chmod a+r /dev/vdb;
         tar -xf /dev/vdb;
         ./configure {configure_opts};
-        make -j{jobs};
-        make check -j{jobs} {verbose};
+        make --output-sync -j{jobs};
+        make --output-sync check -j{jobs} {verbose};
     """
 
     def _gen_cloud_init_iso(self):