kbuild: prepare for moving headers into mach-*/include/mach

In U-Boot, SoC-specific headers are placed in
arch/$(ARCH)/include/asm/arch-$(SOC) and a symbolic link to that
directory is created at the early stage of the build process.

Creating and removing a symbolic link during the build is not
preferred.  In fact, Linux Kernel did away with include/asm-$(ARCH)
directories a long time time ago.

As for ARM, now it is possible to collect SoC sources into
arch/arm/mach-$(SOC).  It is also reasonable to move SoC headers
into arch/arm/mach-$(SOC)/include/mach.

This commit prepares for that.
If the directory arch/$(ARCH)/mach-$(SOC)/include/mach exists,
a symbolic to that directory is created.  Otherwise, a symbolic link
to arch/$(ARCH)/include/asm/arch-$(SOC) or arch-$(CPU) is created.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

diff --git a/scripts/Makefile.autoconf b/scripts/Makefile.autoconf
index 8e9d71f89e8aeb55f41f802915716b7027f42179..58e1642fb93182ee543363fde0b0573595a9180c 100644 (file)
--- a/scripts/Makefile.autoconf
+++ b/scripts/Makefile.autoconf
@@ -85,15 +85,26 @@ include/config.h: scripts/Makefile.autoconf create_symlink FORCE
        $(call filechk,config_h)
 
 # symbolic links
+# If arch/$(ARCH)/mach-$(SOC)/include/mach exists,
+# make a symbolic link to that directory.
+# Otherwise, create a symbolic link to arch/$(ARCH)/include/asm/arch-$(SOC).
 PHONY += create_symlink
 create_symlink:
 ifneq ($(KBUILD_SRC),)
        $(Q)mkdir -p include/asm
-       $(Q)ln -fsn $(KBUILD_SRC)/arch/$(ARCH)/include/asm/arch-$(if $(SOC),$(SOC),$(CPU)) \
-               include/asm/arch
+       $(Q)if [ -d $(KBUILD_SRC)/arch/$(ARCH)/mach-$(SOC)/include/mach ]; then \
+               dest=arch/$(ARCH)/mach-$(SOC)/include/mach;                     \
+       else                                                                    \
+               dest=arch/$(ARCH)/include/asm/arch-$(if $(SOC),$(SOC),$(CPU));  \
+       fi;                                                                     \
+       ln -fsn $(KBUILD_SRC)/$$dest include/asm/arch
 else
-       $(Q)ln -fsn arch-$(if $(SOC),$(SOC),$(CPU)) \
-               arch/$(ARCH)/include/asm/arch
+       $(Q)if [ -d arch/$(ARCH)/mach-$(SOC)/include/mach ]; then       \
+               dest=../../mach-$(SOC)/include/mach;                    \
+       else                                                            \
+               dest=arch-$(if $(SOC),$(SOC),$(CPU));                   \
+       fi;                                                             \
+       ln -fsn $$dest arch/$(ARCH)/include/asm/arch
 endif
 
 PHONY += FORCE