linux-kernel - [PATCH v2] kbuild: make samples really depend on headers

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Date:   Wed,  8 Aug 2018 11:14:14 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnd Bergmann <arnd@...db.de>, linux-kbuild@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] kbuild: make samples really depend on headers_install

Kernel headers must be installed into $(objtree)/usr/include to avoid
the build failure of samples.

Commit ddea05fa148b ("kbuild: make samples depend on headers_install")
addressed this, but "samples/" is only used for the single target build.

"make samples/" properly installs kernel headers, but it does not work
for general building because a phony target "sample" (no trailing slash)
is used.

Reported-by: David Howells <dhowells@...hat.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

Changes in v2:
  - Correct commit log (backslash -> slash)
  - Fix a typo

 Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 7a3c454..1e47d13 100644
--- a/Makefile
+++ b/Makefile
@@ -1009,9 +1009,10 @@ ifdef CONFIG_GDB_SCRIPTS
 endif
 	+$(call if_changed,link-vmlinux)
 
-# Build samples along the rest of the kernel
+# Build samples along the rest of the kernel. This needs headers_install.
 ifdef CONFIG_SAMPLES
 vmlinux-dirs += samples
+samples: headers_install
 endif
 
 # The actual objects are generated when descending,
-- 
2.7.4