Re: [PATCH Rust front-end v2 34/37] gccrs: add lang.opt

[Richard Biener <richard.guenther@gmail.com>]

On Wed, Aug 24, 2022 at 2:13 PM <herron.philip@googlemail.com> wrote:
>
> From: Philip Herron <philip.herron@embecosm.com>
>
> We have some rust specific langugage options note -fwrapv is enabled by
> default in the code. We are trying to respect options such as
> -Wunused-result which we get by porting over c++ no-discard for rust's
> must-use attribute, so we have enabled these by default directly here.

LGTM

Richard.

> ---
>  gcc/rust/lang.opt | 118 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 118 insertions(+)
>  create mode 100644 gcc/rust/lang.opt
>
> diff --git a/gcc/rust/lang.opt b/gcc/rust/lang.opt
> new file mode 100644
> index 00000000000..1f6855ede1d
> --- /dev/null
> +++ b/gcc/rust/lang.opt
> @@ -0,0 +1,118 @@
> +; Options for the Rust front end.
> +; Copyright (C) 2003-2022 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/>.
> +
> +; See the GCC internals manual for a description of this file's format.
> +
> +; Please try to keep this file in ASCII collating order.
> +
> +; Describes command-line options used by this frontend
> +
> +Language
> +Rust
> +
> +I
> +Rust Joined Separate
> +; Documented in c.opt
> +
> +L
> +Rust Joined Separate
> +; Not documented
> +
> +Wall
> +Rust
> +; Documented in c.opt
> +
> +Wunused-variable
> +Rust Var(warn_unused_variable) Init(1) Warning
> +; documented in common.opt
> +
> +Wunused-const-variable
> +Rust Warning Alias(Wunused-const-variable=, 2, 0)
> +Warn when a const variable is unused.
> +
> +Wunused-const-variable=
> +Rust Joined RejectNegative UInteger Var(warn_unused_const_variable) Init(1) Warning LangEnabledBy(Rust,Wunused-variable, 1, 0) IntegerRange(0, 2)
> +Warn when a const variable is unused.
> +
> +Wunused-result
> +Rust Var(warn_unused_result) Init(1) Warning
> +Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value.
> +
> +frust-crate=
> +Rust Joined RejectNegative
> +-frust-crate=<name>             Set the crate name for the compilation
> +
> +frust-debug
> +Rust Var(flag_rust_debug)
> +Dump various Rust front end internals.
> +
> +frust-dump-
> +Rust Joined RejectNegative
> +-frust-dump-<type>     Dump Rust frontend internal information.
> +
> +frust-max-recursion-depth=
> +Rust RejectNegative Type(int) Var(rust_max_recursion_depth) Init(64)
> +-frust-max-recursion-depth=integer
> +
> +frust-mangling=
> +Rust Joined RejectNegative Enum(frust_mangling) Var(flag_rust_mangling)
> +-frust-mangling=[legacy|v0]     Choose which version to use for name mangling
> +
> +Enum
> +Name(frust_mangling) Type(int) UnknownError(unknown rust mangling option %qs)
> +
> +EnumValue
> +Enum(frust_mangling) String(legacy) Value(0)
> +
> +EnumValue
> +Enum(frust_mangling) String(v0) Value(1)
> +
> +frust-cfg=
> +Rust Joined RejectNegative
> +-frust-cfg=<name>             Set a config expansion option
> +
> +frust-edition=
> +Rust Joined RejectNegative Enum(frust_edition) Var(flag_rust_edition)
> +-frust-edition=[2015|2018|2021]             Choose which edition to use when compiling rust code
> +
> +Enum
> +Name(frust_edition) Type(int) UnknownError(unknown rust edition %qs)
> +
> +EnumValue
> +Enum(frust_edition) String(2015) Value(0)
> +
> +EnumValue
> +Enum(frust_edition) String(2018) Value(1)
> +
> +EnumValue
> +Enum(frust_edition) String(2021) Value(2)
> +
> +frust-embed-metadata
> +Rust Var(flag_rust_embed_metadata)
> +Flag to enable embeding metadata directly into object files
> +
> +frust-metadata-output=
> +Rust Joined RejectNegative
> +-frust-metadata-output=<path.rox>  Path to output crate metadata
> +
> +o
> +Rust Joined Separate
> +; Documented in common.opt
> +
> +; This comment is to ensure we retain the blank line above.
> --
> 2.25.1
>