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Subject[PATCH 07/15] kbuild: build all prerequisite of headers_install simultaneously
Date
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>
---

Makefile | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index e998c40c94b4..f9c206eb3583 100644
--- a/Makefile
+++ b/Makefile
@@ -1181,8 +1181,7 @@ export INSTALL_HDR_PATH = $(objtree)/usr
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 @@ ifdef CONFIG_HEADERS_CHECK
all: headers_check
endif

+PHONY += scripts_unifdef
+scripts_unifdef: scripts_basic
+ $(Q)$(MAKE) $(build)=scripts scripts/unifdef
+
# ---------------------------------------------------------------------------
# Kernel selftest

--
2.17.1
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