何时在 Rust 发布版本中使用符号剥离？

Question

删除发布配置文件中的调试信息将我的板条箱的二进制大小减少了三分之一（从 1.9 MB 到 1.3 MB）。这是我添加的：

[profile.release]
strip = true
# or strip = "symbols"

为什么在发布配置文件中默认禁用剥离？

我阅读了有关带状货物选项的部分，但我仍然对其内部结构有点不确定。

始终在发布配置文件中使用它是否有任何缺点 - 也许只会增加编译时间？

Answer 1

调试信息是对调试有用的信息。特别是，二进制文件的某些部分以帮助您调试二进制文件的方式映射到源代码--release。

例如，给定以下代码：

fn main() {
  foo();
}

#[inline(never)]
fn foo() {
  panic!("hello");
}

包含调试信息的堆栈跟踪如下所示（正在运行RUST_BACKTRACE=full cargo run --release）：

...

  12:     0x563a420d5c5c - std::sys_common::backtrace::__rust_end_short_backtrace::h356ecf2a7ec67271
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/std/src/sys_common/backtrace.rs:138:18
  13:     0x563a420d7162 - rust_begin_unwind
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/std/src/panicking.rs:584:5
  14:     0x563a420c0833 - core::panicking::panic_fmt::h9555dfef52eae25e
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/core/src/panicking.rs:142:14
  15:     0x563a420c0b59 - playground::foo::h556d88610d3b7d1f
  16:     0x563a420c0b06 - playground::main::h2eebec7531673915
  17:     0x563a420c0af3 - std::sys_common::backtrace::__rust_begin_short_backtrace::haa748201e9438a0f
  18:     0x563a420c0b99 - std::rt::lang_start::{{closure}}::h605b074d393b11eb
  19:     0x563a420d19bf - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hed7373fa9659f259
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/core/src/ops/function.rs:280:13
  20:     0x563a420d19bf - std::panicking::try::do_call::h60869ea5a827d812
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/std/src/panicking.rs:492:40
  21:     0x563a420d19bf - std::panicking::try::he306a2f2634a9efa
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/std/src/panicking.rs:456:19
  22:     0x563a420d19bf - std::panic::catch_unwind::hd1d792c621528cfe
                               at /rustc/060e47f74a91b28c3db28d80a6a9d6841ca51026/library/std/src/panic.rs:137:14

...

如果没有调试信息，它看起来像这样：

   0:     0x55d165a94750 - <unknown>
   1:     0x55d165aaf00e - <unknown>
   2:     0x55d165a92575 - <unknown>
   3:     0x55d165a95ea3 - <unknown>
   4:     0x55d165a95b8f - <unknown>
   5:     0x55d165a9654a - <unknown>
   6:     0x55d165a96401 - <unknown>
   7:     0x55d165a94c5c - <unknown>
   8:     0x55d165a96162 - <unknown>
   9:     0x55d165a7f833 - <unknown>
  10:     0x55d165a7fb49 - <unknown>
  11:     0x55d165a7faf6 - <unknown>
  12:     0x55d165a7fb83 - <unknown>
  13:     0x55d165a7fb99 - <unknown>
  14:     0x55d165a909bf - <unknown>
  15:     0x55d165a7fb72 - <unknown>
  16:     0x7fddc5a16237 - __libc_start_call_main
  17:     0x7fddc5a162f5 - __libc_start_main_impl
  18:     0x55d165a7fa21 - <unknown>
  19:                0x0 - <unknown>

根据经验，我将其保留（即我不删除调试信息），除非我真的很关心二进制大小。