KBuild: silence "'scripts/unifdef' is up to date."

While changing our build system over to use the headers_install target
as part of our klibc build, the following message started showing up in
our logs:

make[2]: `scripts/unifdef' is up to date.

It turns out that the build blindly invokes a recursive make on this
target, which causes make to emit this message when the target is
already up to date.  This isn't seen for most targets as the rest of the
build relies primarily on the default target and on PHONY targets when
invoking make recursively.

Silence the above message when building unifdef as part of
headers_install by hiding it behind a new PHONY target called
"build_unifdef" that has an empty recipe.

Signed-off-by: Mike Waychison <mikew@google.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

diff --git a/Makefile b/Makefile
index 2b1e37da2bb59e5dc7e0311fffd34ef74893cfbc..0bf29dcc66fc80862d30de294feba4abf8619bb5 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1022,7 +1022,7 @@ hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 
 PHONY += __headers
 __headers: include/linux/version.h scripts_basic FORCE
-       $(Q)$(MAKE) $(build)=scripts scripts/unifdef
+       $(Q)$(MAKE) $(build)=scripts build_unifdef
 
 PHONY += headers_install_all
 headers_install_all:

diff --git a/scripts/Makefile b/scripts/Makefile
index 2e088109fbd5238f3e4f6d293848606d0ac95a58..fcea26168bca718afb07cf4a2a71081b309e906e 100644 (file)
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -18,6 +18,11 @@ always               := $(hostprogs-y) $(hostprogs-m)
 # The following hostprogs-y programs are only build on demand
 hostprogs-y += unifdef
 
+# This target is used internally to avoid "is up to date" messages
+PHONY += build_unifdef
+build_unifdef: scripts/unifdef FORCE
+       @:
+
 subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-y                     += mod
 subdir-$(CONFIG_SECURITY_SELINUX) += selinux