[PATCH 2/2] kbuild: add -I$(srctree)/$(src) automatically for hostprogs with O=

[Masahiro Yamada]

When building kernel objects with the O= option, scripts/Makefile.lib
automatically adds both -I$(srctree)/$(src) and -I$(obj) so each
Makefile does not need to add them explicitly.

In contrast, scripts/Makefile.host adds only -I$(obj) when building
host programs with the O= option. As a result, each Makefile must add
the extra option to include checkin headers from generated C files.

Let's cater to this in the build system for consistency, and drop
extra options from the kconfig, dtc, genksyms Makefiles.

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---

 scripts/Makefile.host     | 4 ++--
 scripts/dtc/Makefile      | 4 ----
 scripts/genksyms/Makefile | 4 ----
 scripts/kconfig/Makefile  | 2 --
 4 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index a115259..c41d5a1d 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -72,8 +72,8 @@ __hostcxx_flags	= $(_hostcxx_flags)
 
 ifeq ($(KBUILD_EXTMOD),)
 ifneq ($(KBUILD_SRC),)
-__hostc_flags	= -I$(obj) $(call flags,_hostc_flags)
-__hostcxx_flags	= -I$(obj) $(call flags,_hostcxx_flags)
+__hostc_flags	= -I $(srctree)/$(src) -I $(obj) $(call flags,_hostc_flags)
+__hostcxx_flags	= -I $(srctree)/$(src) -I $(obj) $(call flags,_hostcxx_flags)
 endif
 endif
 
diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 5f227d8..72d3fa4 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -22,9 +22,5 @@ dtc-objs	+= yamltree.o
 HOSTLDLIBS_dtc	:= -lyaml
 endif
 
-# Generated files need one more search path to include headers in source tree
-HOSTCFLAGS_dtc-lexer.lex.o := -I$(src)
-HOSTCFLAGS_dtc-parser.tab.o := -I$(src)
-
 # dependencies on generated files need to be listed explicitly
 $(obj)/dtc-lexer.lex.o: $(obj)/dtc-parser.tab.h
diff --git a/scripts/genksyms/Makefile b/scripts/genksyms/Makefile
index 03b7ce9..ae5953d 100644
--- a/scripts/genksyms/Makefile
+++ b/scripts/genksyms/Makefile
@@ -30,9 +30,5 @@ $(obj)/parse.tab.h: $(src)/parse.y FORCE
 
 endif
 
-# -I needed for generated C source (shipped source)
-HOSTCFLAGS_parse.tab.o := -I$(src)
-HOSTCFLAGS_lex.lex.o := -I$(src)
-
 # dependencies on generated files need to be listed explicitly
 $(obj)/lex.lex.o: $(obj)/parse.tab.h
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 1819735..12cb5eb 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -146,8 +146,6 @@ help:
 common-objs	:= confdata.o expr.o symbol.o preprocess.o zconf.lex.o zconf.tab.o
 
 $(obj)/zconf.lex.o: $(obj)/zconf.tab.h
-HOSTCFLAGS_zconf.lex.o	:= -I$(src)
-HOSTCFLAGS_zconf.tab.o	:= -I$(src)
 
 # conf: Used for defconfig, oldconfig and related targets
 hostprogs-y	+= conf
-- 
2.7.4