tree 8d727e69ee73d264c626599c794718d47b228599
parent 6796e80409b9031458e33dc39a3ac8aa3b93855b
author Masahiro Yamada <masahiroy@kernel.org> 1628836205 +0900
committer Masahiro Yamada <masahiroy@kernel.org> 1630624639 +0900

kbuild: warn if FORCE is missing for if_changed(_dep,_rule) and filechk

if_changed, if_changed_dep, and if_changed_rule must have FORCE as a
prerequisite so the command line change is detected.

Documentation/kbuild/makefiles.rst clearly explains it:

  Note: It is a typical mistake to forget the FORCE prerequisite.

However, not all people follow the document.

This mistake occurred again and again, so a compelling force is needed.

Show a warning if FORCE is missing in the prerequisite of if_changed
and friends. Same for filechk.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nicolas Schier <n.schier@avm.de>