kbuild: use in-kernel unifdef
Let headers_install use in-kernel unifdef
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/Makefile b/Makefile
index edfc2fd..b06b1ea 100644
--- a/Makefile
+++ b/Makefile
@@ -893,8 +893,8 @@
export INSTALL_HDR_PATH
PHONY += headers_install
-headers_install: include/linux/version.h
- $(Q)unifdef -Ux /dev/null
+headers_install: include/linux/version.h scripts_basic FORCE
+ $(Q)$(MAKE) $(build)=scripts scripts/unifdef
$(Q)rm -rf $(INSTALL_HDR_PATH)/include
$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include
diff --git a/scripts/Makefile b/scripts/Makefile
index 6f6b48f..d531a1f 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -15,6 +15,9 @@
always := $(hostprogs-y)
+# The following hostprogs-y programs are only build on demand
+hostprogs-y += unifdef
+
subdir-$(CONFIG_MODVERSIONS) += genksyms
subdir-$(CONFIG_MODULES) += mod
diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
index 12e1daf..8c02d2d 100644
--- a/scripts/Makefile.headersinst
+++ b/scripts/Makefile.headersinst
@@ -7,7 +7,7 @@
#
# ==========================================================================
-UNIFDEF := unifdef -U__KERNEL__
+UNIFDEF := scripts/unifdef -U__KERNEL__
# Eliminate the contents of (and inclusions of) compiler.h
HDRSED := sed -e "s/ inline / __inline__ /g" \