[Buildroot] using a variable within a buildroot menuconfig

[Buildroot] using a variable within a buildroot menuconfig

[Jan Pohanka]

Hi all,

I have another /weird/ question.

I would like to know if it is possible to create an item in 
configuration which will for example contain some (absolute) path on my 
filesystem. Then I would like to use this variable for example in 
--extra-cflags configure option for applications like ffmpeg etc.

I know that it is not very nice way, but I need to integrate buildroot 
with Texas Instruments SDK, which is not very GNU build tools friendy.

best regards
Jan
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[Buildroot] using a variable within a buildroot menuconfig

[Arnout Vandecappelle]

On 25/06/13 09:58, Jan Pohanka wrote:
> Hi all,
>
> I have another /weird/ question.
>
> I would like to know if it is possible to create an item in configuration
> which will for example contain some (absolute) path on my filesystem.
> Then I would like to use this variable for example in --extra-cflags
> configure option for applications like ffmpeg etc.

  I'm afraid that I don't understand your question. string type 
configuration variables can contain any kind of string, including paths 
of files. This is used for instance in BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE.

  Specifically for ffmpeg, however, there is already the 
BR2_PACKAGE_FFMPEG_EXTRACONF option. You can just set that to
--extra-cflags '-fPIC -DMY_DEFINE' (note the funky quoting, which I'm not 
100% sure will work correctly).

> I know that it is not very nice way, but I need to integrate buildroot
> with Texas Instruments SDK, which is not very GNU build tools friendy.

  I wonder what you mean with the TI SDK. You probably mean you have to 
use _some packages_ that are in the 700MB self-extractor, right? Because 
the SDK itself is in fact a replacement for buildroot (or buildroot is a 
replacement for the SDK, depending on how you want to look at it :-).

  Getting that stuff to work is absolute horror, I can testify. I did 
that a year and a half ago for the DM365 multimedia codecs, but I never 
found a reasonable solution to extract and build individual packages.


  Regards,
  Arnout


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
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[Buildroot] using a variable within a buildroot menuconfig

[Peter Korsgaard]

>>>>> "Arnout" == Arnout Vandecappelle <arnout@mind.be> writes:

Hi,

 >> I know that it is not very nice way, but I need to integrate buildroot
 >> with Texas Instruments SDK, which is not very GNU build tools friendy.

 Arnout>  I wonder what you mean with the TI SDK. You probably mean you have to
 Arnout> use _some packages_ that are in the 700MB self-extractor, right?
 Arnout> Because the SDK itself is in fact a replacement for buildroot (or
 Arnout> buildroot is a replacement for the SDK, depending on how you want to
 Arnout> look at it :-).

 Arnout>  Getting that stuff to work is absolute horror, I can testify. I did
 Arnout> that a year and a half ago for the DM365 multimedia codecs, but I
 Arnout> never found a reasonable solution to extract and build individual
 Arnout> packages.

FYI, I'm currently looking at more-or-less the same horror, E.G. the
1.6G ezsdk blob for ti81xx.

-- 
Bye, Peter Korsgaard

[Buildroot] using a variable within a buildroot menuconfig

[Danomi Manchego]

On Thu, Jun 27, 2013 at 8:25 AM, Peter Korsgaard <jacmet@uclibc.org> wrote:

> FYI, I'm currently looking at more-or-less the same horror, E.G. the
> 1.6G ezsdk blob for ti81xx.


I too am a victim of the ti81xx EZSDK horror.  I've been compiling the
EZSDK on its own, doing a "make install EXEC_DIR=/some/place", and then
using a script to selectively pull stuff out of the created install tree
into something like a target skeleton overlay that gets installed into
staging as well.  It works, but stinks for source control.  (Check in the
whole 1.6G, most of which is worthless and takes a long time to compile, or
check in the resulting overlay, which feels hacky?)
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[Buildroot] using a variable within a buildroot menuconfig

[Peter Korsgaard]

>>>>> "Danomi" == Danomi Manchego <danomimanchego123@gmail.com> writes:

 Danomi> On Thu, Jun 27, 2013 at 8:25 AM, Peter Korsgaard?<jacmet@uclibc.org>?wrote:
 Danomi>     FYI, I'm currently looking at more-or-less the same horror, E.G. the
 Danomi>     1.6G ezsdk blob for ti81xx.

 Danomi> I too am a victim of the ti81xx EZSDK horror. ?I've been
 Danomi> compiling the EZSDK on its own, doing a "make install
 Danomi> EXEC_DIR=/some/place", and then using a script to selectively
 Danomi> pull stuff out of the created install tree into something like
 Danomi> a target skeleton overlay that gets installed into staging as
 Danomi> well. ?It works, but stinks for source control. ?(Check in the
 Danomi> whole 1.6G, most of which is worthless and takes a long time to
 Danomi> compile, or check in the resulting overlay, which feels hacky?)

Yeah, I would like to be able to clean it up enough to get it added to
mainline Buildroot, but I've only now started looking..
-- 
Bye, Peter Korsgaard

[Buildroot] using a variable within a buildroot menuconfig

[Thomas Petazzoni]

Dear Jan Pohanka,

On Tue, 25 Jun 2013 09:58:00 +0200, Jan Pohanka wrote:

> I have another /weird/ question.
> 
> I would like to know if it is possible to create an item in 
> configuration which will for example contain some (absolute) path on my 
> filesystem. Then I would like to use this variable for example in 
> --extra-cflags configure option for applications like ffmpeg etc.
> 
> I know that it is not very nice way, but I need to integrate buildroot 
> with Texas Instruments SDK, which is not very GNU build tools friendy.

I'm not sure to really understand what you want to do here. You can
always create string options:

config BR2_SOME_PATH
	string
	default "/path/to/somewhere/"

and then in some .mk file, you can use:

	$(BR2_SOME_PATH)

to refer to still variable, or:

	$(call qstrip,$(BR2_SOME_PATH))

if you want to get rid of the quotes around the variable value.

Does this answer your questions?

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com