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The c++tools makefile doesn't remove progressively more files in each of mostlyclean, clean, and distclean. Instead, each removes a different set of files (and some files are not removed by any target). Use prerequisites so that everything is removed. Also, building in the $objdir/c++tools directory doesn't work, because the INSTALL variable is never set. It works when building from the top-level because INSTALL is set in the environment when recursively invoking make for sub-directories. c++tools/ChangeLog: PR bootstrap/101834 * Makefile.in (INSTALL): Set variable. (mostlyclean): Mark as a phony target. (clean): Add mostlyclean as a prerequisite. (distclean): Add clean as a prerequisite and remove more files. (maintainer-clean): Add distclean as a prerequisite.
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