[Buildroot] [PATCH v4] linux-headers: allow use of headers from kernel "package" selected

[Peter Korsgaard <peter@korsgaard.com>]

>>>>> "Thomas" == Thomas Petazzoni <thomas.petazzoni@free-electrons.com> writes:

Hi,

 >> So perhaps we need an option to use the linux source for our kernel
 >> headers? It does mean that people need to jump back and forth between
 >> the toolchain and linux menus.

 > Adding the option is not the problem. The problem is that from
 > package/linux-headers/linux-headers.mk, you can't use variables defined
 > from linux/linux.mk. So all you can do in
 > package/linux-headers/linux-headers.mk is duplicate the logic from
 > linux/linux.mk that will calculate LINUX_HEADERS_{VERSION,SITE,SOURCE}
 > and apply the custom patches from the BR2_LINUX_KERNEL_* Config.in
 > values.

Well, linux-headers doesn't need to do much - So with a bit of care I
think you can.

E.G. something like (completely untested):

ifeq ($(LINUX_HEADERS_FROM_KERNEL),y)
# no source
LINUX_HEADERS_SOURCE =
LINUX_HEADERS_DEPENDENCIES += linux-configure
LINUX_HEADERS_BUILD_DIR = $(LINUX_DIR)
else
..
LINUX_HEADERS_BUILD_DIR = $(@D)
endif

..
define LINUX_HEADERS_INSTALL_STAGING_CMDS
	(cd $(LINUX_HEADERS_BUILD_DIR); \
		$(TARGET_MAKE_ENV) $(MAKE) \


But it isn't very pretty / robust.

-- 
Venlig hilsen,
Peter Korsgaard