From: Richard Sandiford <richard.sandiford@arm.com>
To: FX via Gcc <gcc@gcc.gnu.org>
Cc: FX <fxcoudert@gmail.com>, Iain Sandoe <iain@sandoe.co.uk>
Subject: Re: C++11 code in the gcc 10 branch
Date: Mon, 21 Dec 2020 14:49:24 +0000 [thread overview]
Message-ID: <mpty2hrmcy3.fsf@arm.com> (raw)
In-Reply-To: <B9A871FA-94CB-46BF-886A-7EFAC11F32EC@gmail.com> (FX via Gcc's message of "Mon, 21 Dec 2020 15:34:51 +0100")
FX via Gcc <gcc@gcc.gnu.org> writes:
> I’m trying to bootstrap a GCC 10 compiler on macOS with clang, and I am getting errors in stage 1, because there is C++11 code that is rejected by clang (because the bootstrap involves compiling stage 1 with -std=gnu++98, online on master (see top-level configure.ac). These errors are not seen, I believe, when GCC is the bootstrap compiler, because GCC will issue a warning instead of an error (as clang does).
>
> One place with such issue is in aarch64-builtins.c, which contains a C++11 constructor. I can fix it with this:
>
> diff --git a/gcc/config/aarch64/aarch64-builtins.c b/gcc/config/aarch64/aarch64-builtins.c
> index cba596765..184e9095d 100644
> --- a/gcc/config/aarch64/aarch64-builtins.c
> +++ b/gcc/config/aarch64/aarch64-builtins.c
> @@ -1225,8 +1225,9 @@ aarch64_init_memtag_builtins (void)
> = aarch64_general_add_builtin ("__builtin_aarch64_memtag_"#N, \
> T, AARCH64_MEMTAG_BUILTIN_##F); \
> aarch64_memtag_builtin_data[AARCH64_MEMTAG_BUILTIN_##F - \
> - AARCH64_MEMTAG_BUILTIN_START - 1] = \
> - {T, CODE_FOR_##I};
> + AARCH64_MEMTAG_BUILTIN_START - 1].ftype = T; \
> + aarch64_memtag_builtin_data[AARCH64_MEMTAG_BUILTIN_##F - \
> + AARCH64_MEMTAG_BUILTIN_START - 1].icode = CODE_FOR_##I;
>
> fntype = build_function_type_list (ptr_type_node, ptr_type_node,
> uint64_type_node, NULL);
>
> […stuff that Iain has already answered…]
>
> I would welcome:
>
> 1. confirmation that the C++11 code in aarch64-builtins.c is indeed a bug, and that a patch for it would be welcome
Yeah, it's definitely a bug, thanks for catching it. The patch above
is OK.
Thanks,
Richard
next prev parent reply other threads:[~2020-12-21 14:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-21 14:34 FX
2020-12-21 14:39 ` Iain Sandoe
2020-12-21 14:49 ` Richard Sandiford [this message]
2020-12-31 16:52 ` Gerald Pfeifer
2020-12-31 17:47 ` FX
2020-12-31 17:54 ` Iain Sandoe
2020-12-31 18:45 ` FX
2021-01-01 10:21 ` Iain Sandoe
2020-12-31 17:55 ` Richard Sandiford
2021-01-01 10:28 ` Andreas Schwab
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