linux-kernel - Re: [PATCH] kbuild: avoid conflict between -ffunction-sections and -pg on gcc-4.7

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Message-ID: <CAK7LNAR5nc=jsG+6Q59uHfu_W-qV4q2k5fx=AdduUV283OkY3g@mail.gmail.com>
Date:   Sun, 23 Apr 2017 15:53:44 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: avoid conflict between -ffunction-sections and
 -pg on gcc-4.7

2017-04-14 15:17 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> Arnd Bergmann reported:
>   "When ftrace is enabled and we build with gcc-4.7 or older, we
>   get a warning for each file on architectures that select
>   CONFIG_LD_DEAD_CODE_DATA_ELIMINATION:
>
>   warning: -ffunction-sections disabled; it makes profiling impossible [enabled by default]
>   "
>
> Since commit c3f0d0bc5b01 ("kbuild, LLVMLinux: Add -Werror to
> cc-option to support clang"), warnings are treated as errors in
> cc-option checks.  CC_FLAGS_FTRACE is blindly added to KBUILD_CFLAGS,
> so $(call cc-option,-ffunction-sections,) should be moved below it
> in order to detect the conflict between the two options.
>
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>


Applied to linux-kbuild/kbuild.


-- 
Best Regards
Masahiro Yamada