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Message-ID: <202004070945.D6E095F7@keescook>
Date: Tue, 7 Apr 2020 09:45:42 -0700
From: Kees Cook <keescook@...omium.org>
To: Frédéric Pierret (fepitre) <frederic.pierret@...es-os.org>
Cc: re.emese@...il.com, kernel-hardening@...ts.openwall.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gcc-common.h: 'params.h' has been dropped in GCC10
On Tue, Apr 07, 2020 at 01:32:59PM +0200, Frédéric Pierret (fepitre) wrote:
> Moreover, GCC10 complains about gimple definition. For example,
> doing a 'scripts/gcc-plugin.sh g++ g++ gcc' returns:
>
> In file included from <stdin>:1:
> ./gcc-plugins/gcc-common.h:852:13: error: redefinition of ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const ggoto*]’
> 852 | inline bool is_a_helper<const ggoto *>::test(const_gimple gs)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from ./gcc-plugins/gcc-common.h:125,
> from <stdin>:1:
> /usr/lib/gcc/x86_64-redhat-linux/10/plugin/include/gimple.h:1037:1: note: ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const ggoto*]’ previously declared here
> 1037 | is_a_helper <const ggoto *>::test (const gimple *gs)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from <stdin>:1:
> ./gcc-plugins/gcc-common.h:859:13: error: redefinition of ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const greturn*]’
> 859 | inline bool is_a_helper<const greturn *>::test(const_gimple gs)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from ./gcc-plugins/gcc-common.h:125,
> from <stdin>:1:
> /usr/lib/gcc/x86_64-redhat-linux/10/plugin/include/gimple.h:1489:1: note: ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const greturn*]’ previously declared here
> 1489 | is_a_helper <const greturn *>::test (const gimple *gs)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> A hacky way for solving this is to ignore them for GCC10.
Hi! Thanks for the patch. I don't think this is a hack: it's the right
thing to do here, yes? GCC 10 includes this helper in gimple.h, so we
can ifdef it out in gcc-common.h.
-Kees
>
> Signed-off-by: Frédéric Pierret (fepitre) <frederic.pierret@...es-os.org>
> ---
> scripts/gcc-plugins/gcc-common.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/scripts/gcc-plugins/gcc-common.h b/scripts/gcc-plugins/gcc-common.h
> index 17f06079a712..9ad76b7f3f10 100644
> --- a/scripts/gcc-plugins/gcc-common.h
> +++ b/scripts/gcc-plugins/gcc-common.h
> @@ -35,7 +35,9 @@
> #include "ggc.h"
> #include "timevar.h"
>
> +#if BUILDING_GCC_VERSION < 10000
> #include "params.h"
> +#endif
>
> #if BUILDING_GCC_VERSION <= 4009
> #include "pointer-set.h"
> @@ -847,6 +849,7 @@ static inline gimple gimple_build_assign_with_ops(enum tree_code subcode, tree l
> return gimple_build_assign(lhs, subcode, op1, op2 PASS_MEM_STAT);
> }
>
> +#if BUILDING_GCC_VERSION < 10000
> template <>
> template <>
> inline bool is_a_helper<const ggoto *>::test(const_gimple gs)
> @@ -860,6 +863,7 @@ inline bool is_a_helper<const greturn *>::test(const_gimple gs)
> {
> return gs->code == GIMPLE_RETURN;
> }
> +#endif
>
> static inline gasm *as_a_gasm(gimple stmt)
> {
> --
> 2.25.2
>
>
--
Kees Cook
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