configure: Dump build CONFIG to sourceable file

Change-Id: I33d03d1850c92673f28107d52c886df5bfb685f1
Signed-off-by: Michal Berger <michalx.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1106
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

.gitignore

@@ -31,3 +31,4 @@ mk/cc.flags.mk
 PYTHON_COMMAND
 test_completions.txt
 timing.txt
+test/common/build_config.sh

configure

@@ -804,6 +804,11 @@ rm -f $rootdir/mk/cc.flags.mk
 [ -n "$DESTDIR" ] && echo "DESTDIR?=$DESTDIR" >> $rootdir/mk/cc.flags.mk
 echo "done."
 
+# Create .sh with build config for easy sourcing|lookup during the tests.
+for conf in "${!CONFIG[@]}"; do
+	echo "CONFIG_$conf=${CONFIG[$conf]}"
+done >"$rootdir/test/common/build_config.sh"
+
 if [[ $sys_name == "FreeBSD" ]]; then
 	echo "Type 'gmake' to build."
 else