Why both `make clean` and `make mrproper` are used?
Cleaning is done on three levels, as described in a comment in the Linux kernel Makefile:
### # Cleaning is done on three levels. # make clean Delete most generated files # Leave enough to build external modules # make mrproper Delete the current configuration, and all generated files # make distclean Remove editor backup files, patch leftover files and the like
According to the Makefile, the
mrproper target depends on the
clean target (see line 1421). Additionally, the
distclean target depends on
make mrproper will therefore be enough as it would also remove the same things as what the
clean target would do (and more).
mrproper target was added in 1993 (Linux 0.97.7) and has always depended on the
clean target. This means that it was never necessary to use both targets as in
make clean && make mrproper.
Historic reference: https://archive.org/details/git-history-of-linux
clean is a prerequisite for
mrproper target in Makefile, so executing
make clean separately is redundant.