; Options for the Rust front end. ; Copyright (C) 2003-2025 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) 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) Warning LangEnabledBy(Rust,Wunused-variable, 1, 0) IntegerRange(0, 2) Warn when a const variable is unused. Wunused-result Rust Var(warn_unused_result) Warning Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value. Winfinite-recursion Rust Var(warn_infinite_recursion) Warning Warn for infinitely recursive calls. frust-crate= Rust Joined RejectNegative -frust-crate=<name> Set the crate name for the compilation frust-extern= Rust RejectNegative Joined -frust-extern= Specify where an external library is located 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-incomplete-and-experimental-compiler-do-not-use Rust Var(flag_rust_experimental) Enable experimental compilation of Rust files at your own risk frust-max-recursion-depth= Rust RejectNegative Type(int) Var(rust_max_recursion_depth) Init(64) -frust-max-recursion-depth=<integer> frust-crate-type= Rust Joined RejectNegative Enum(frust_crate_type) Var(flag_rust_crate_type) -frust-crate-type=[bin|lib|rlib|dylib|cdylib|staticlib|proc-macro] Crate type to emit Enum Name(frust_crate_type) Type(int) UnknownError(unknown crate type: '%qs') EnumValue Enum(frust_crate_type) String(bin) Value(0) EnumValue Enum(frust_crate_type) String(lib) Value(1) EnumValue Enum(frust_crate_type) String(rlib) Value(2) EnumValue Enum(frust_crate_type) String(dylib) Value(3) EnumValue Enum(frust_crate_type) String(cdylib) Value(4) EnumValue Enum(frust_crate_type) String(staticlib) Value(5) EnumValue Enum(frust_crate_type) String(proc-macro) Value(6) frust-mangling= Rust Joined RejectNegative Enum(frust_mangling) Var(flag_rust_mangling) -frust-mangling=[legacy|v0] 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] 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) Enable embedding 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 frust-compile-until= Rust Joined RejectNegative Enum(frust_compile_until) Var(flag_rust_compile_until) -frust-compile-until=[ast|attributecheck|expansion|astvalidation|featuregating|nameresolution|lowering|typecheck|privacy|unsafety|const|borrowcheck|compilation|end] The pipeline will run up until this stage when compiling Rust code Enum Name(frust_compile_until) Type(int) UnknownError(unknown rust compile-until %qs) EnumValue Enum(frust_compile_until) String(ast) Value(0) EnumValue Enum(frust_compile_until) String(attributecheck) Value(1) EnumValue Enum(frust_compile_until) String(expansion) Value(2) EnumValue Enum(frust_compile_until) String(astvalidation) Value(3) EnumValue Enum(frust_compile_until) String(featuregating) Value(4) EnumValue Enum(frust_compile_until) String(nameresolution) Value(5) EnumValue Enum(frust_compile_until) String(lowering) Value(6) EnumValue Enum(frust_compile_until) String(typecheck) Value(7) EnumValue Enum(frust_compile_until) String(privacy) Value(8) EnumValue Enum(frust_compile_until) String(unsafety) Value(9) EnumValue Enum(frust_compile_until) String(const) Value(10) EnumValue Enum(frust_compile_until) String(borrowcheck) Value(11) EnumValue Enum(frust_compile_until) String(compilation) Value(12) EnumValue Enum(frust_compile_until) String(end) Value(13) frust-name-resolution-2.0 Rust Var(flag_name_resolution_2_0) Use the temporary and experimental name resolution pipeline instead of the stable one frust-borrowcheck Rust Var(flag_borrowcheck) Use the WIP borrow checker. frust-panic= Rust Joined RejectNegative Enum(frust_panic) Var(flag_rust_panic) -frust-edition=[unwind|abort] Panic strategy to compile crate with Enum Name(frust_panic) Type(int) UnknownError(unknown panic strategy %qs) EnumValue Enum(frust_panic) String(unwind) Value(0) EnumValue Enum(frust_panic) String(abort) Value(1) frust-overflow-checks Rust Var(flag_overflow_checks) Init(1) Enable the overflow checks in code generation ; This comment is to ensure we retain the blank line above.