[Buildroot] using LINUX_DIR variable in BR

[Buildroot] using LINUX_DIR variable in BR

[ravi chandran]

Hi,
     I am trying to include the path of the linux kernel(source located in
output/build/linux) in one of the makefile which is located outside the
linux directory.

KERNEL_DIR := $(LINUX_DIR).

But when i try to refer the  KERNEL_DIR , it is empty.

Am i missing something here, can some one please help?

I used LINUX_DIR variable as it is mentioned in the BR doc

You may also reference (but you may *not* set!) those variables:

   - LINUX_DIR contains the path to where the Linux kernel has been
   extracted and built.
   - LINUX_VERSION contains the version string as configured by the user.
   - LINUX_VERSION_PROBED contains the real version string of the kernel,
   retrieved with running make -C $(LINUX_DIR) kernelrelease
   - KERNEL_ARCH contains the name of the current architecture, like arm,
   mips?

Thanks,
Ravi
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.busybox.net/pipermail/buildroot/attachments/20180726/83e6dd89/attachment.html>

[Buildroot] using LINUX_DIR variable in BR

[Thomas Petazzoni]

Hello,

On Thu, 26 Jul 2018 22:13:10 +0530, ravi chandran wrote:

>      I am trying to include the path of the linux kernel(source located in
> output/build/linux) in one of the makefile which is located outside the
> linux directory.
> 
> KERNEL_DIR := $(LINUX_DIR).

Use the = operator and not the := operator.

See
https://ftp.gnu.org/old-gnu/Manuals/make-3.79.1/html_chapter/make_6.html#SEC59.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com