Re: [PATCH v2 2/3] aarch64: Add support for aarch64-gnu (GNU/Hurd on AArch64)

[Richard Sandiford <richard.sandiford@arm.com>]

Sergey Bugaev <bugaevc@gmail.com> writes:
> Coupled with a corresponding binutils patch, this produces a toolchain that can
> sucessfully build working binaries targeting aarch64-gnu.
>
> gcc/Changelog:
>
> 	* config.gcc: Recognize aarch64*-*-gnu* targets.
> 	* config/aarch64/aarch64-gnu.h: New file.
>
> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
> ---
>  gcc/config.gcc                   |  6 +++
>  gcc/config/aarch64/aarch64-gnu.h | 68 ++++++++++++++++++++++++++++++++
>  2 files changed, 74 insertions(+)
>  create mode 100644 gcc/config/aarch64/aarch64-gnu.h

I don't know if you're waiting on me, but just in case: this and patch 3
still LGTM if Thomas is OK with them.

Thanks,
Richard

> diff --git a/gcc/config.gcc b/gcc/config.gcc
> index 87a5c92b6..9d935164c 100644
> --- a/gcc/config.gcc
> +++ b/gcc/config.gcc
> @@ -1264,6 +1264,12 @@ aarch64*-*-linux*)
>  	done
>  	TM_MULTILIB_CONFIG=`echo $TM_MULTILIB_CONFIG | sed 's/^,//'`
>  	;;
> +aarch64*-*-gnu*)
> +        tm_file="${tm_file} elfos.h gnu-user.h gnu.h glibc-stdint.h"
> +        tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-errata.h aarch64/aarch64-gnu.h"
> +        tmake_file="${tmake_file} aarch64/t-aarch64"
> +        tm_defines="${tm_defines}  TARGET_DEFAULT_ASYNC_UNWIND_TABLES=1"
> +	;;
>  aarch64*-wrs-vxworks*)
>          tm_file="${tm_file} elfos.h aarch64/aarch64-elf.h"
>          tm_file="${tm_file} vx-common.h vxworks.h aarch64/aarch64-vxworks.h"
> diff --git a/gcc/config/aarch64/aarch64-gnu.h b/gcc/config/aarch64/aarch64-gnu.h
> new file mode 100644
> index 000000000..ee5494034
> --- /dev/null
> +++ b/gcc/config/aarch64/aarch64-gnu.h
> @@ -0,0 +1,68 @@
> +/* Definitions for AArch64 running GNU/Hurd.
> +   Copyright (C) 2009-2024 Free Software Foundation, Inc.
> +
> +   This file is part of GCC.
> +
> +   GCC is free software; you can redistribute it and/or modify it
> +   under the terms of the GNU General Public License as published by
> +   the Free Software Foundation; either version 3, or (at your option)
> +   any later version.
> +
> +   GCC is distributed in the hope that it will be useful, but
> +   WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   General Public License for more details.
> +
> +   You should have received a copy of the GNU General Public License
> +   along with GCC; see the file COPYING3.  If not see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#ifndef GCC_AARCH64_GNU_H
> +#define GCC_AARCH64_GNU_H
> +
> +#define GNU_USER_DYNAMIC_LINKER "/lib/ld-aarch64%{mbig-endian:_be}%{mabi=ilp32:_ilp32}.so.1"
> +
> +#define CPP_SPEC "%{pthread:-D_REENTRANT}"
> +
> +#define GNU_TARGET_LINK_SPEC  "%{h*}		\
> +   %{static:-Bstatic}				\
> +   %{shared:-shared}				\
> +   %{symbolic:-Bsymbolic}			\
> +   %{!static:%{!static-pie:			\
> +     %{rdynamic:-export-dynamic}		\
> +     %{!shared:-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}}} \
> +   %{static-pie:-Bstatic -pie --no-dynamic-linker -z text} \
> +   -X						\
> +   %{mbig-endian:-EB} %{mlittle-endian:-EL}     \
> +   -maarch64gnu%{mabi=ilp32:32}%{mbig-endian:b}"
> +
> +
> +#define LINK_SPEC GNU_TARGET_LINK_SPEC AARCH64_ERRATA_LINK_SPEC
> +
> +#define GNU_USER_TARGET_MATHFILE_SPEC \
> +  "%{Ofast|ffast-math|funsafe-math-optimizations:%{!shared:crtfastmath.o%s}}"
> +
> +#undef ENDFILE_SPEC
> +#define ENDFILE_SPEC   \
> +  GNU_USER_TARGET_MATHFILE_SPEC " " \
> +  GNU_USER_TARGET_ENDFILE_SPEC
> +
> +#define TARGET_OS_CPP_BUILTINS()		\
> +  do						\
> +    {						\
> +	GNU_USER_TARGET_OS_CPP_BUILTINS();	\
> +    }						\
> +  while (0)
> +
> +#define TARGET_ASM_FILE_END aarch64_file_end_indicate_exec_stack
> +
> +/* Uninitialized common symbols in non-PIE executables, even with
> +   strong definitions in dependent shared libraries, will resolve
> +   to COPY relocated symbol in the executable.  See PR65780.  */
> +#undef TARGET_BINDS_LOCAL_P
> +#define TARGET_BINDS_LOCAL_P default_binds_local_p_2
> +
> +/* Define this to be nonzero if static stack checking is supported.  */
> +#define STACK_CHECK_STATIC_BUILTIN 1
> +
> +#endif  /* GCC_AARCH64_GNU_H */