[master] 6cd97d1 Introduce a `vtest-clean` make target

[Dridi Boukelmoune]

commit 6cd97d1167353a5129ee39f9524fa39eb195a9f4
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Dec 23 11:07:28 2016 +0100

    Introduce a `vtest-clean` make target
    
    When a `distcheck` fails, the $(distdir) is not removed and this is how
    we can collect test results. This directory is also left untouched by
    the `distclean` target run from `autogen.des`.
    
    So if the next commit checked by vtest fails before running inside the
    $(distdir), it will report failures from the previous run. To avoid that
    we can use $(am__remove_distdir) that deals with permissions but may not
    be stable API.

diff --git a/Makefile.am b/Makefile.am
index 0488281..f018bc8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -32,6 +32,9 @@ distcleancheck_listfiles = \
 	find . -type f -exec sh -c 'test -f $(srcdir)/$$1 || echo $$1' \
 		sh '{}' ';'
 
+vtest-clean:
+	$(am__remove_distdir)
+
 # XXX: This is a hack to ensure we have a built source tree when
 # running make dist If we had used non-recursive make we could have
 # solved it better, but we don't, so use this at least for now.
diff --git a/tools/vtest.sh b/tools/vtest.sh
index 4f732cb..a4e9fa6 100755
--- a/tools/vtest.sh
+++ b/tools/vtest.sh
@@ -76,6 +76,7 @@ autogen () (
 makedistcheck () (
 	set -e
 	cd "${BUILDDIR}"
+	nice make vtest-clean
 	nice make distcheck
 )