kbuild: check arch/$(SRCARCH)/include/generated before out-of-tree build
After cross-compiling the kernel, "make mrproper" should be executed
with the proper ARCH= option. Otherwise, stale objects will remain
under arch/$(SRCARCH)/.
One bad scenario is like this:
$ make ARCH=arm defconfig all # cross-compile the kernel for arm
$ make mrproper # mrproper for host-arch (i.e. x86)
$ make ARCH=arm O=build_dir defconfig all
If you miss ARCH= for mrproper and cross-compile the kernel with O=
and ARCH= options, Kbuild will happily start to build, but may fail
due to stale objects in the srctree.
If $(srctree)/arch/$(SRCARCH)/include/generated/ exists, let's stop
the out-of-tree build. To detect this, mrproper should clean only
arch/$(SRCARCH)/include/generated/.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
1 file changed