Add check-exactness target with -j support

It is still on going.

One of the issues is that for some mystic reason, the
HAVE_EXACTNESS_DATA seems not checked as the target check-exactness is
always present, no matter if the submodule exists.

Makefile.am

@@ -20,3 +20,13 @@ pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = exactness.pc
 
 ACLOCAL_AMFLAGS = -I m4
+
+if HAVE_EXACTNESS_DATA
+
+check-exactness:
+	$(eval JOBS := $(shell [[ "${MAKEFLAGS}" =~ -j([0-9]+) ]] && echo $${BASH_REMATCH[1]} || echo 1))
+	cd exactness-elm-data/default-profile; exactness -j ${JOBS} -p -b recordings tests.txt; cd -
+
+.PHONY: check-exactness
+
+endif

configure.ac

@@ -68,3 +68,7 @@ src/bin/Makefile
 src/lib/Makefile
 exactness.pc
 ])
+
+exactness_data_dir=${srcdir}/exactness-elm-data/default-profile
+AC_CHECK_FILE([$exactness_data_dir], [have_exactness_data="yes"], [have_exactness_data="no"])
+AM_CONDITIONAL([HAVE_EXACTNESS_DATA], [test "x${have_exactness_data}" = "xyes"])