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Date: Sun, 29 Mar 2020 20:04:14 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Emese Revfy <re.emese@...il.com>,
Michal Marek <michal.lkml@...kovi.net>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] kbuild: add -Wall to KBUILD_HOSTCXXFLAGS
On Thu, Mar 26, 2020 at 11:06 AM Kees Cook <keescook@...omium.org> wrote:
>
> On Wed, Mar 25, 2020 at 12:14:32PM +0900, Masahiro Yamada wrote:
> > Add -Wall to catch more warnings for C++ host programs.
> >
> > When I submitted the previous version, the 0-day bot reported
> > -Wc++11-compat warnings for old GCC:
> >
> > HOSTCXX -fPIC scripts/gcc-plugins/latent_entropy_plugin.o
> > In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/tm.h:28:0,
> > from scripts/gcc-plugins/gcc-common.h:15,
> > from scripts/gcc-plugins/latent_entropy_plugin.c:78:
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/config/elfos.h:102:21: warning: C++11 requires a space between string literal and macro [-Wc++11-compat]
> > fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
> > ^
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/config/elfos.h:170:24: warning: C++11 requires a space between string literal and macro [-Wc++11-compat]
> > fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
> > ^
> > In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/tm.h:42:0,
> > from scripts/gcc-plugins/gcc-common.h:15,
> > from scripts/gcc-plugins/latent_entropy_plugin.c:78:
> > /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/defaults.h:126:24: warning: C++11 requires a space between string literal and macro [-Wc++11-compat]
> > fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
> > ^
> >
> > The source of the warnings is in the plugin headers, so we have no
> > control of it. I just suppressed them by adding -Wno-c++11-compat to
> > scripts/gcc-plugins/Makefile.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>
> Acked-by: Kees Cook <keescook@...omium.org>
>
> -Kees
Applied to linux-kbuild.
--
Best Regards
Masahiro Yamada
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