====== env variables ======


[[https://www.kernel.org/doc/Documentation/kbuild/kconfig.rst|kconfig doc]]

kconfig tool ''conf'' is also controlled by env variables:

Output files generation:
  * KCONFIG_CONFIG - override default ''.config''
  * KCONFIG_AUTOCONFIG - overrides default ''include/config/auto.conf''
  * KCONFIG_AUTOHEADER - overrides default ''include/generated/autoconf.h''
  * KCONFIG_RUSTCCFG -  - overrides default ''include/generated/rustc_cfg''
Other:
  * KCONFIG_ALLCONFIG
  * KCONFIG_OVERWRITECONFIG - in place overwrite of ''.config'' to work with symlinks. Tmpfile and rename is used otherwise.
  * KCONFIG_DEFCONFIG_LIST - if defconfig not specified, use list of files to combine it
  * KCONFIG_NOSILENTUPDATE
  * KCONFIG_SEED
  * KCONFIG_PROBABILITY
  * SRCTREE - when specified try to find files also in SRCTREE:
    * First trying to open exact file name: ''./<filename>''
    * Then trying to open ''${SRCTREE}/<filename>''
  * CONFIG_ - override default config prefix ''CONFIG_''
  * MENUCONFIG_MODE
  * NCONFIG_MODE
  * ZCONF_DEBUG
  * MENUCONFIG_COLOR