try not deleting the entire build dir every step

scripts/test_cpp.bash

@@ -20,8 +20,8 @@ source ${SUPERDIR}/scripts/bash/retry_command.bash
 source ${OPTS}
 CTEST="ctest -V --timeout ${DXT_TEST_TIMEOUT:-300} -j ${DXT_TEST_PROCS:-2}"
 
-rm -rf ${DUNE_BUILD_DIR}
-${SRC_DCTRL} ${BLD} --module=${MY_MODULE} all
+# rm -rf ${DUNE_BUILD_DIR}
+# ${SRC_DCTRL} ${BLD} --module=${MY_MODULE} all
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD}
 if [ "${TESTS_MODULE_SUBDIR}" = "None" ] ; then
   ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD} test_binaries

scripts/test_python.bash

@@ -17,8 +17,8 @@ set -x
 
 source ${SUPERDIR}/scripts/bash/retry_command.bash
 
-rm -rf ${DUNE_BUILD_DIR}
-${SRC_DCTRL} ${BLD} --module=${MY_MODULE} all
+# rm -rf ${DUNE_BUILD_DIR}
+# ${SRC_DCTRL} ${BLD} --module=${MY_MODULE} all
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD}
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD} bindings
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD} test_python