build/rust/std/gnrt_config.toml

# Copyright 2023 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Provides per-crate and overall configuration options to gnrt.

[all]
# force-unstable-if-unmarked prevents normal crates from inadvertently using
# symbols from std-internal dependencies in the sysroot. This is normally passed
# during an x.py build, but we have to do it manually.
rustflags = ['-Zforce-unstable-if-unmarked']

# Override the GN output dir. We direct std targets to output directly to the
# sysroot we'll use later. This must stay in sync with `local_rustc_sysroot` in
# //build/rust/std/BUILD.gn
output_dir = '$root_out_dir/local_rustc_sysroot/lib/rustlib/$rust_abi_target/lib/'

# This target provides setup needed for building std.
extra_gn_deps = ['//build/rust/std:std_build_deps']

[crate.libc]
# Many flags are set by libc's build.rs based on new enough rustc but we don't
# run build scripts for std crates.
# See https://github.com/rust-lang/libc/blob/master/build.rs
cfg = ['libc_priv_mod_use', 'libc_union', 'libc_const_size_of', 'libc_align',
'libc_int128', 'libc_core_cvoid', 'libc_packedN', 'libc_cfg_target_vendor',
'libc_non_exhaustive', 'libc_long_array', 'libc_ptr_addr_of',
'libc_underscore_const_names', 'libc_const_extern_fn'
]

[crate.std]
# Requires:
# * cfg(backtrace_in_libstd) because it directly includes .rs files from the
#   backtrace code rather than including it as a dependency. backtrace's
#   implementation has special-purpose code to handle this.
# * STD_ENV_ARCH is referenced in architecture-dependent code. Note this is the
#   target arch, and as such `$rust_target_arch` is passed literally to GN. This
#   variable is set at build time in build/config/rust.gni
#
# See https://github.com/rust-lang/rust/blob/master/library/std/build.rs
cfg = ['backtrace_in_libstd']
env = ['STD_ENV_ARCH=$rust_target_arch']

[crate.test]
# Requires:
# * CFG_DISABLE_UNSTABLE_FEATURES=0 to match how it's built by x.py.
env = ['CFG_DISABLE_UNSTABLE_FEATURES=0']

# test only depends on proc_macro as an internal detail of the Rust build, so
# it's implicitly included with std/test. However, we list the std crates and
# construct the sysroot explicitly. We don't need this, and we don't even want
# it during cross-compiles (since we will only build host proc_macro crates).
exclude_deps_in_gn = ['proc_macro']

[crate.unwind]
# The unwind crate has #[link] directives to the native unwind library, but we
# either get that automatically by linking with clang++, or build and link the
# lib from //buildtools/third_party/libunsind explicitly. Disable -lfoo linker
# flags from this crate.
rustflags = ['-Zlink-directives=false']