[Buildroot] [PATCH] add pre-build script
arnout at mind.be
Thu Feb 14 22:10:04 UTC 2013
On 14/02/13 18:04, Thomas Petazzoni wrote:
> Dear Spenser Gilliland,
> On Thu, 14 Feb 2013 10:28:24 -0600, Spenser Gilliland wrote:
>> I'm not doing this with the specific implementation posted. I'm just
>> saying it would be a nice feature to have. Many device trees specify
>> processor/arch features and optimized cflags can be constructed from
>> this data.
>> I currently do this outside of buildroot and just provide
>> BR2_TARGET_OPTIMIZATION on the make command line from the buildscripts
>> for the hardware.
>> It would be nice to have buildroot completely self contained and not
>> require the software developers to download the additional hardware
> Indeed, but the pre-build script approach you posted would not allow to
> customize the CFLAGS.
Spenser didn't post it...
> The CFLAGS are part of Buildroot .config file,
> which is loaded at the time you run "make".
Ah, right, major shortcoming if the pre-build script can't update the
> So when your pre-build
> script gets executed by Buildroot, make has already loaded the value of
> You would have to make a specific script that returns custom CFLAGS,
> and add some code in Buildroot that does:
> CUSTOM_CFLAGS = $(shell ./your/custom/script)
This is a good place to do := instead of =, otherwise the script gets
re-run for every build step...
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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