arch/x86/Makefile.inc: Pass $(AS) and $(CPP) to SeaBIOS

SeaBIOS’ Makefile requires cpp (C Preprocessor) to build. Modify
the xcompile script to search for cpp program path, and pass it to
SeaBIOS’ `Makefile.inc`. Also pass the program path for as (GNU assembler).

This is needed, so the crossgcc toolchain to build the SeaBIOS payload
under Mac OSX. OSX ships a cpp program, but it works differently
from GNU CPP, so we need to override it.

Change-Id: If996ffbb76ec4bd16079b54b41f3fac07bfe25be
Signed-off-by: Andrew Wu <arw@dmp.com.tw>
Reviewed-on: http://review.coreboot.org/3896
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Jonathan A. Kollasch <jakllsch@kollasch.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index dec32e5dc2..b709d14a9d 100644
--- a/Makefile
+++ b/Makefile
@@ -126,6 +126,7 @@ ARCH-$(CONFIG_ARCH_X86)     := i386
 ifneq ($(INNER_SCANBUILD),y)
 CC := $(CC_$(ARCH-y))
 endif
+CPP := $(CPP_$(ARCH-y))
 AS := $(AS_$(ARCH-y))
 LD := $(LD_$(ARCH-y))
 NM := $(NM_$(ARCH-y))