[U-Boot] [PATCH] Makefile: Include vendor common library in include search path

[Nishanth Menon <nm@ti.com>]

On 11/10/2015 08:55 AM, Nishanth Menon wrote:
> On 12:25-20151110, Masahiro Yamada wrote:
>> 2015-11-10 5:24 GMT+09:00 Simon Glass <sjg@chromium.org>:
>>>>> I am unhappy because I was hoping
>>>>> we could stop creating symbolic links during building
>>>>> in a long run.
>>>
>>> But how? I don't see that it is possible if we want to have a sensible
>>> prefix for each include.
>>
>>
>> [step 1] move SoC-specific headers to  arch/<arch>/mach-<soc>/include/mach
>>
>> [step 2] change  #include <asm/arch/foo.h> to #include <mach/foo.h>
>>
>> [step 3] Drop CONFIG_CREATE_ARCH_SYMLINK
>>
>>
>> For example, mach-uniphier finished [1] and [2],
>> so it does not require the symbolic link.
>> (several ARM SoCs finished [1])
>>
>>
>> I think this is the way ARM should do, at least.
>>
>> The topic of debate is PowerPC.  Should we introduce mach-<soc>
>> directories or not?
>>
> 
> OK: Option 4:
> 
> How about this guys? include/board-common is an actual directory
> and instead of headers being located in board/$(VENDOR)/common or
> board/$(VENDOR)/common/include, we move the common headers to
> include/board/$(VENDOR)/ Directory. This will make the usage as follows:
> 
> #include <$(VENDOR)/xyz.h>
> 
> I know this does not exactly meet Simon's suggestion here of being
> identifiably board-common/xyz.h -> but at least knowing the prefix as
> vendor name implies a board common header.
> 
> diff --git a/Makefile b/Makefile
> index 3c21f8ddf9e9..2bd684199512 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -620,6 +620,7 @@ c_flags := $(KBUILD_CFLAGS) $(cpp_flags)
>  # U-Boot objects....order is important (i.e. start must be first)
>  
>  HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(srctree)/board/$(VENDOR)/common/Makefile),y,n)
> +UBOOTINCLUDE += $(if $(HAVE_VENDOR_COMMON_LIB:y=1), -I$(srctree)/include/board-common)
>  
>  libs-y += lib/
>  libs-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/
> 
> How does this sound?
> 
Spin off from option 4 is option 5 -> where we dont have the Makefile
change. the board includes are located in
include/board-common/$(VENDOR)/ directory.


Usage will be:

#include <board-common/$(VENDOR)/xyz.h>


Almost meets Simon's needs(identifiable as board common header) and I
think matches what Masahiro-san wants as well(no symlinks).


OK, i am out of ideas at least for now... Any other suggestions / opinions?
-- 
Regards,
Nishanth Menon