[U-Boot] [PATCH/next v3] allow boards to customize compiler options on a per-file/dir basis

[Jean-Christophe PLAGNIOL-VILLARD]

On 09:33 Sun 14 Jun     , Mike Frysinger wrote:
> With our Blackfin boards, we like to build the compression routines with
> -O2 as our tests show a pretty good size/speed tradeoff.  For the rest of
> U-Boot though, we want to stick with the default -Os as that is mostly
> control code.  So in our case, we would add a line like so to the board
> specific config.mk file:
> 	CFLAGS_lib_generic += -O2
> 
> Now all files under lib_generic/ will have -O2 appended to their build.
> 
> Signed-off-by: Mike Frysinger <vapier at gentoo.org>
> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
> v3
> 	- updated to apply to next after Jean's changes
> 
>  config.mk |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/config.mk b/config.mk
> index 8d47a8e..f5b9c28 100644
> --- a/config.mk
> +++ b/config.mk
> @@ -206,11 +206,13 @@ export	TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
>  
>  #########################################################################
>  
> +# Allow boards to use custom optimize flags on a per dir/file basis
> +BCURDIR := $(notdir $(CURDIR))
>  $(obj)%.s:	%.S
> -	$(CPP) $(AFLAGS) -o $@ $<
> +	$(CPP) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $<
we can drop this one as there is no obj %.s

Best Regards,
J.