linux-kernel - [PATCH 0/2] kbuild: use relative path from $(srctree) instead of __FILE_

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Date:   Thu, 12 Oct 2017 18:56:02 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Joe Perches <joe@...ches.com>, Tom Rini <trini@...sulko.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Arnd Bergmann <arnd@...db.de>, James Hogan <jhogan@...nel.org>,
        linux-kernel@...r.kernel.org,
        Jan-Simon Möller <dl9pf@....de>,
        Michal Marek <michal.lkml@...kovi.net>,
        Douglas Anderson <dianders@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Charlebois <charlebm@...il.com>
Subject: [PATCH 0/2] kbuild: use relative path from $(srctree) instead of __FILE__

Kbuild works in objtree, not in srctree.  So, __FILE__ is prefixed
with $(srctree)/ for out-of-tree build.

For example, WARN_ON() will look as follows if you built your kernel
out of source tree:

WARNING: CPU: 1 PID: 1 at /path/to/build/directory/arch/arm64/kernel/foo.c:...

With this series, it will always look like follows regardless of O= option.

WARNING: CPU: 1 PID: 1 at arch/arm64/kernel/foo.c:...

If GCC does not support -Wno-builtin-macro-redefined (i.e. gcc version < 4.4),
the output is prefixed with absolute path.

Masahiro Yamada (2):
  kbuild: add stringify helper to quote a string passed to C files
  kbuild: redefine __FILE__ as relative path from $(srctree) if possible

 Makefile               | 9 +++++++++
 scripts/Kbuild.include | 4 ++++
 scripts/Makefile.lib   | 2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)

-- 
2.7.4