kbuild: build all prerequisites of headers_install simultaneously
Currently, scripts/unifdef is compiled after scripts_basic,
uapi-asm-generic, archheaders, and archscripts.
The proper dependency is just scripts_basic. There is no problem
to compile scripts/unifdef and other headers at the same time.
Split scripts_unifdef out in order to allow more parallel building.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/Makefile b/Makefile
index 6abcacf..39ee585 100644
--- a/Makefile
+++ b/Makefile
@@ -1181,8 +1181,7 @@
PHONY += archheaders archscripts
PHONY += __headers
-__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
- $(Q)$(MAKE) $(build)=scripts scripts/unifdef
+__headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
PHONY += headers_install
headers_install: __headers
@@ -1204,6 +1203,10 @@
all: headers_check
endif
+PHONY += scripts_unifdef
+scripts_unifdef: scripts_basic
+ $(Q)$(MAKE) $(build)=scripts scripts/unifdef
+
# ---------------------------------------------------------------------------
# Kernel selftest