Makefile: refactor include path settings

[karo-tx-uboot.git] / Makefile

diff --git a/Makefile b/Makefile
index 3a97483d453d1fa454e074ba02062d7507e1eb91..9c3902274bab63d868063097f3b862cc49c224cc 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -226,6 +226,15 @@ CHECK              = sparse
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
                  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
 
+# Use UBOOTINCLUDE when you must reference the include/ directory.
+# Needed to be compatible with the O= option
+UBOOTINCLUDE    :=
+ifneq ($(OBJTREE),$(SRCTREE))
+UBOOTINCLUDE   += -I$(OBJTREE)/include
+endif
+UBOOTINCLUDE   += -I$(srctree)/include \
+               -I$(srctree)/arch/$(ARCH)/include
+
 KBUILD_CPPFLAGS := -D__KERNEL__
 
 KBUILD_CFLAGS   := -Wall -Wstrict-prototypes \
@@ -238,7 +247,7 @@ export CPP AR NM LDR STRIP OBJCOPY OBJDUMP
 export MAKE AWK
 export DTC CHECK CHECKFLAGS
 
-export KBUILD_CPPFLAGS
+export KBUILD_CPPFLAGS NOSTDINC_FLAGS UBOOTINCLUDE
 export KBUILD_CFLAGS KBUILD_AFLAGS
 
 KBUILD_CFLAGS += -Os #-fomit-frame-pointer
@@ -254,6 +263,9 @@ KBUILD_CFLAGS       += -g
 # option to the assembler.
 KBUILD_AFLAGS  += -g
 
+NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+CHECKFLAGS     += $(NOSTDINC_FLAGS)
+
 # Report stack usage if supported
 KBUILD_CFLAGS += $(call cc-option,-fstack-usage)