autotools-bootstrap.bbclass: initial add

bootstrap is another magic script which is intended run before autotools. The
class created runs this script at the right time and ensures that sources of
gnulib are not cloned during configure.

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>

meta-oe/classes/autotools-bootstrap.bbclass

@@ -0,0 +1,24 @@
+# Class to inherit when you want to build with autotools after running bootstrap
+inherit autotools
+
+DEPENDS += "gnulib"
+
+do_configure_prepend() {
+    currdir=`pwd`
+    cd ${S}
+
+    # avoid bootstrap cloning gnulib on every configure
+    cat >.gitmodules <<EOF
+[submodule "gnulib"]
+	path = gnulib
+	url = git://git.sv.gnu.org/gnulib
+EOF
+    cp -rf ${STAGING_DATADIR}/gnulib ${S}
+
+    # --force to avoid errors on reconfigure e.g if recipes changed we depend on
+    # | bootstrap: running: libtoolize --quiet
+    # | libtoolize:   error: 'libltdl/COPYING.LIB' exists: use '--force' to overwrite
+    # | ...
+    ./bootstrap --force
+    cd $currdir
+}