On Thu, Nov 29, 2018 at 8:31 PM Steffen Trumtrar
<s.trumtrar@xxxxxxxxxxxxxx> wrote:
>
> The barebox Makefiles do not use KBUILD_CPPFLAGS but CPPFLAGS as variable name.
>
> Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
> ---
This might be a step backward.
In old days, Linux also used well-known CPPFLAGS.
Then Linux renamed CPPFLAGS -> KBUILD_CFLAGS
See the following commit:
commit 06c5040cdb13d27adad118f2fbfae905a1911b37
Author: Sam Ravnborg <sam@neptun.(none)>
Date: Mon Oct 15 22:17:25 2007 +0200
kbuild: enable 'make CPPFLAGS=...' to add additional options to CPP
Barebox forked from U-Boot around 2007,
so maybe Barebox is based on older Makefiles.
> scripts/Kbuild.include | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> index e62bd35692d0..0cb3a70a6a42 100644
> --- a/scripts/Kbuild.include
> +++ b/scripts/Kbuild.include
> @@ -111,12 +111,12 @@ as-instr = $(call try-run,\
> # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
>
> cc-option = $(call try-run,\
> - $(CC) $(KBUILD_CPPFLAGS) $(CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
> + $(CC) $(CPPFLAGS) $(CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
>
> # cc-option-yn
> # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
> cc-option-yn = $(call try-run,\
> - $(CC) $(KBUILD_CPPFLAGS) $(CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
> + $(CC) $(CPPFLAGS) $(CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
>
> # cc-option-align
> # Prefix align with either -falign or -malign
> @@ -126,7 +126,7 @@ cc-option-align = $(subst -functions=0,,\
> # cc-disable-warning
> # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
> cc-disable-warning = $(call try-run,\
> - $(CC) $(KBUILD_CPPFLAGS) $(CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1)))
> + $(CC) $(CPPFLAGS) $(CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1)))
>
> # cc-version
> # Usage gcc-ver := $(call cc-version)
> --
> 2.19.2
>
>
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--
Best Regards
Masahiro Yamada
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