tree 1aa2f8b8100f67ba0b14e75c13bdd07db8464ba5
parent a5139fb368d2639afc6a3ea7e444f22a3e8ed3be
author Masahiro Yamada <yamada.masahiro@socionext.com> 1566449173 +0900
committer Masahiro Yamada <yamada.masahiro@socionext.com> 1567090469 +0900

kbuild: check clean srctree even earlier

Move the outputmakefile target to the leftmost in the prerequisite list
so that this is checked first. GNU Make processes the prerequisites
left to right.

GNU Make will keep to stick to this behavior, and it seems even
POSIX standard, according to this:
https://lists.gnu.org/archive/html/bug-make/2019-08/msg00030.html

The POSIX standard of make is available here:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/make.html

Of course, when the parallel option -j given, other targets will be run
simultaneously but it is nice to show the error as early as possible.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>