[U-Boot] sandbox: Use system headers first for sandbox's os.c in a different way

Commit cbe5cdfcd changed config.mk and arch/sandbox/cpu/Makefile
to use -idirafter instead of -I and remove -nostdinc.

But
 * Sandbox-specific code dirties config.mk
 * os.c is compiled without such compiler flags as:
      -Wall -Wstrict-prototypes -Wno-format-security
      -fno-builtin -ffreestanding -fno-stack-protector
      -fstack-usage -Wno-format-nonliteral

This commit use -idirafter and remove the -nostdinc
differently and more simply.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>
---

Hello Simon

Could you check if this patch works for you?

 arch/sandbox/cpu/Makefile | 8 ++++----
 config.mk                 | 9 ++-------
 2 files changed, 6 insertions(+), 11 deletions(-)

On 26 November 2013 00:13, Masahiro Yamada <yamada.m@jp.panasonic.com> wrote:
> Commit cbe5cdfcd changed config.mk and arch/sandbox/cpu/Makefile
> to use -idirafter instead of -I and remove -nostdinc.
>
> But
>  * Sandbox-specific code dirties config.mk
>  * os.c is compiled without such compiler flags as:
>       -Wall -Wstrict-prototypes -Wno-format-security
>       -fno-builtin -ffreestanding -fno-stack-protector
>       -fstack-usage -Wno-format-nonliteral
>
> This commit use -idirafter and remove the -nostdinc
> differently and more simply.
>
> Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
> Cc: Simon Glass <sjg@chromium.org>

Acked-by: Simon Glass <sjg@chromium.org>

> ---
>
> Hello Simon
>
> Could you check if this patch works for you?
>
>  arch/sandbox/cpu/Makefile | 8 ++++----
>  config.mk                 | 9 ++-------
>  2 files changed, 6 insertions(+), 11 deletions(-)
>
> diff --git a/arch/sandbox/cpu/Makefile b/arch/sandbox/cpu/Makefile
> index 58c2537..b564294 100644
> --- a/arch/sandbox/cpu/Makefile
> +++ b/arch/sandbox/cpu/Makefile
> @@ -10,7 +10,7 @@
>  obj-y  := cpu.o os.o start.o state.o
>
>  # os.c is build in the system environment, so needs standard includes
> -$(obj)os.o: ALL_CFLAGS := $(BASE_CPPFLAGS) \
> -       $(patsubst %, -idirafter %, $(BASE_INCLUDE_DIRS))
> -$(obj).depend.os: CPPFLAGS := $(BASE_CPPFLAGS) \
> -       $(patsubst %, -idirafter %, $(BASE_INCLUDE_DIRS))
> +$(obj)os.o: CFLAGS := $(filter-out -nostdinc,\
> +       $(patsubst -I%,-idirafter%,$(CFLAGS)))
> +$(obj).depend.os: CPPFLAGS := $(filter-out -nostdinc,\
> +       $(patsubst -I%,-idirafter%,$(CPPFLAGS)))
> diff --git a/config.mk b/config.mk
> index d5b09a0..206de20 100644
> --- a/config.mk
> +++ b/config.mk
> @@ -250,16 +250,11 @@ Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
>  endif
>  endif
>
> -# Sandbox needs the base flags and includes, so keep them around
> -BASE_CPPFLAGS := $(CPPFLAGS)
> -
>  ifneq ($(OBJTREE),$(SRCTREE))
> -BASE_INCLUDE_DIRS := $(OBJTREE)/include
> +CPPFLAGS += -I$(OBJTREE)/include
>  endif
>
> -BASE_INCLUDE_DIRS += $(TOPDIR)/include $(SRCTREE)/arch/$(ARCH)/include
> -
> -CPPFLAGS += $(patsubst %, -I%, $(BASE_INCLUDE_DIRS))
> +CPPFLAGS += -I$(TOPDIR)/include -I$(SRCTREE)/arch/$(ARCH)/include
>  CPPFLAGS += -fno-builtin -ffreestanding -nostdinc      \
>         -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
>
> --
> 1.8.3.2
>

On Tue, Nov 26, 2013 at 04:13:59PM +0900, Masahiro wrote:

> Commit cbe5cdfcd changed config.mk and arch/sandbox/cpu/Makefile
> to use -idirafter instead of -I and remove -nostdinc.
> 
> But
>  * Sandbox-specific code dirties config.mk
>  * os.c is compiled without such compiler flags as:
>       -Wall -Wstrict-prototypes -Wno-format-security
>       -fno-builtin -ffreestanding -fno-stack-protector
>       -fstack-usage -Wno-format-nonliteral
> 
> This commit use -idirafter and remove the -nostdinc
> differently and more simply.
> 
> Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
> Cc: Simon Glass <sjg@chromium.org>
> Acked-by: Simon Glass <sjg@chromium.org>

Applied to u-boot/master, thanks!