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    SubjectRe: [PATCH AUTOSEL 5.10 45/51] gcc-plugins: fix gcc 11 indigestion with plugins...
    This will need an additional fix, so please don't backport it yet.

    On Tue, Jan 12, 2021 at 07:55:27AM -0500, Sasha Levin wrote:
    > From: Valdis Klētnieks <valdis.kletnieks@vt.edu>
    >
    > [ Upstream commit 67a5a68013056cbcf0a647e36cb6f4622fb6a470 ]
    >
    > Fedora Rawhide has started including gcc 11,and the g++ compiler
    > throws a wobbly when it hits scripts/gcc-plugins:
    >
    > HOSTCXX scripts/gcc-plugins/latent_entropy_plugin.so
    > In file included from /usr/include/c++/11/type_traits:35,
    > from /usr/lib/gcc/x86_64-redhat-linux/11/plugin/include/system.h:244,
    > from /usr/lib/gcc/x86_64-redhat-linux/11/plugin/include/gcc-plugin.h:28,
    > from scripts/gcc-plugins/gcc-common.h:7,
    > from scripts/gcc-plugins/latent_entropy_plugin.c:78:
    > /usr/include/c++/11/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO
    > C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
    > 32 | #error This file requires compiler and library support \
    >
    > In fact, it works just fine with c++11, which has been in gcc since 4.8,
    > and we now require 4.9 as a minimum.
    >
    > Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
    > Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
    > Signed-off-by: Kees Cook <keescook@chromium.org>
    > Link: https://lore.kernel.org/r/82487.1609006918@turing-police
    > Signed-off-by: Sasha Levin <sashal@kernel.org>
    > ---
    > scripts/gcc-plugins/Makefile | 4 ++--
    > 1 file changed, 2 insertions(+), 2 deletions(-)
    >
    > diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
    > index d66949bfeba45..b5487cce69e8e 100644
    > --- a/scripts/gcc-plugins/Makefile
    > +++ b/scripts/gcc-plugins/Makefile
    > @@ -22,9 +22,9 @@ always-y += $(GCC_PLUGIN)
    > GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
    >
    > plugin_cxxflags = -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
    > - -I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++98 \
    > + -I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++11 \
    > -fno-rtti -fno-exceptions -fasynchronous-unwind-tables \
    > - -ggdb -Wno-narrowing -Wno-unused-variable -Wno-c++11-compat \
    > + -ggdb -Wno-narrowing -Wno-unused-variable \
    > -Wno-format-diag
    >
    > plugin_ldflags = -shared
    > --
    > 2.27.0
    >

    --
    Kees Cook

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