The C code generated by these tools used to be included in the source tree but has now been removed.
The keyword tables for genkyms and kconfig are now linear arrays, not hash tables generated by ghash. The filenames changed accordingly.
By passing both -C and -f options to make, we can separate makefiles from the output directory without adding prefixes to all targets. We can also reduce the 'clean' commands to little more than 'rm -rf'.
Ben Hutchings