d2ed8cf661
This feature is intended to provide expensive but thorough help for developers who have an unexpected `TypeId` value and need to determine what type it actually is. It causes `impl Debug for TypeId` to print the type name in addition to the opaque ID hash, and in order to do so, adds a name field to `TypeId`. The cost of this is the increased size of `TypeId` and the need to store type names in the binary; therefore, it is an optional feature. It may be enabled via `cargo -Zbuild-std -Zbuild-std-features=debug_typeid`. (Note that `-Zbuild-std-features` disables default features which you may wish to reenable in addition; see <https://doc.rust-lang.org/cargo/reference/unstable.html#build-std-features>.) Example usage and output: ``` fn main() { use std::any::{Any, TypeId}; dbg!(TypeId::of::<usize>(), drop::<usize>.type_id()); } ``` ``` TypeId::of::<usize>() = TypeId(0x763d199bccd319899208909ed1a860c6 = usize) drop::<usize>.type_id() = TypeId(0xe6a34bd13f8c92dd47806da07b8cca9a = core::mem::drop<usize>) ``` Also added feature declarations for the existing `debug_refcell` feature so it is usable from the `rust.std-features` option of `config.toml`.
33 lines
1.3 KiB
TOML
33 lines
1.3 KiB
TOML
[package]
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name = "sysroot"
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version = "0.0.0"
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edition = "2021"
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# this is a dummy crate to ensure that all required crates appear in the sysroot
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[dependencies]
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proc_macro = { path = "../proc_macro" }
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profiler_builtins = { path = "../profiler_builtins", optional = true }
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std = { path = "../std" }
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test = { path = "../test" }
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# Forward features to the `std` crate as necessary
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[features]
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default = ["std_detect_file_io", "std_detect_dlsym_getauxval", "panic-unwind"]
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backtrace = ["std/backtrace"]
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compiler-builtins-c = ["std/compiler-builtins-c"]
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compiler-builtins-mem = ["std/compiler-builtins-mem"]
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compiler-builtins-no-asm = ["std/compiler-builtins-no-asm"]
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compiler-builtins-no-f16-f128 = ["std/compiler-builtins-no-f16-f128"]
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compiler-builtins-mangled-names = ["std/compiler-builtins-mangled-names"]
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debug_refcell = ["std/debug_refcell"]
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debug_typeid = ["std/debug_typeid"]
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llvm-libunwind = ["std/llvm-libunwind"]
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system-llvm-libunwind = ["std/system-llvm-libunwind"]
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optimize_for_size = ["std/optimize_for_size"]
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panic-unwind = ["std/panic_unwind"]
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panic_immediate_abort = ["std/panic_immediate_abort"]
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profiler = ["dep:profiler_builtins"]
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std_detect_file_io = ["std/std_detect_file_io"]
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std_detect_dlsym_getauxval = ["std/std_detect_dlsym_getauxval"]
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std_detect_env_override = ["std/std_detect_env_override"]
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windows_raw_dylib = ["std/windows_raw_dylib"]
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