[m-dev.] realclean in test_mercury

[Ian MacLarty]

Does anyone know what the point of the realclean in the following block
of commands from the test_mercury script is?

autoconf || { false; exit 1; }
rm -f config.cache
./configure --prefix=$INSTALL_DIR $CONFIG_OPTS || { false; exit 1; }
mmake $target_opts depend $PARALLEL || { false; exit 1; }
mmake $target_opts realclean MMAKEFLAGS=$PARALLEL || { false; exit 1; }
./configure --prefix=$INSTALL_DIR $CONFIG_OPTS || { false; exit 1; }
mmake $target_opts depend $PARALLEL || { false; exit 1; }
version=`mmake $target_opts version` || { false; exit 1; }
fullarch=`mmake $target_opts fullarch` || { false; exit 1; }
tools/bootcheck $use_cp_opt $target_opts \
	--keep-objs --copy-runtime --copy-profilers \
	--no-test-suite $PARALLEL || $install_anyway || { false; exit 1; }

Ian.

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