Rollup merge of #64444 - RalfJung:no-backtrace, r=alexcrichton

fix building libstd without backtrace feature

Fixes https://github.com/rust-lang/rust/issues/64410

r? @alexcrichton

1 files changed, 5 insertions, 4 deletions

diff --git a/src/libstd/sys_common/backtrace.rs b/src/libstd/sys_common/backtrace.rs
index 1a78abf5086..01711d415d8 100644
--- a/src/libstd/sys_common/backtrace.rs
+++ b/src/libstd/sys_common/backtrace.rs
@@ -7,10 +7,9 @@ use crate::io;
 use crate::borrow::Cow;
 use crate::io::prelude::*;
 use crate::path::{self, Path, PathBuf};
-use crate::sync::atomic::{self, Ordering};
 use crate::sys::mutex::Mutex;
 
-use backtrace::{BacktraceFmt, BytesOrWideString, PrintFmt};
+use backtrace_rs::{BacktraceFmt, BytesOrWideString, PrintFmt};
 
 /// Max number of frames to print.
 const MAX_NB_FRAMES: usize = 100;
@@ -74,14 +73,14 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
     bt_fmt.add_context()?;
     let mut idx = 0;
     let mut res = Ok(());
-    backtrace::trace_unsynchronized(|frame| {
+    backtrace_rs::trace_unsynchronized(|frame| {
         if print_fmt == PrintFmt::Short && idx > MAX_NB_FRAMES {
             return false;
         }
 
         let mut hit = false;
         let mut stop = false;
-        backtrace::resolve_frame_unsynchronized(frame, |symbol| {
+        backtrace_rs::resolve_frame_unsynchronized(frame, |symbol| {
             hit = true;
             if print_fmt == PrintFmt::Short {
                 if let Some(sym) = symbol.name().and_then(|s| s.as_str()) {
@@ -130,6 +129,8 @@ where
 // For now logging is turned off by default, and this function checks to see
 // whether the magical environment variable is present to see if it's turned on.
 pub fn log_enabled() -> Option<PrintFmt> {
+    use crate::sync::atomic::{self, Ordering};
+
     // Setting environment variables for Fuchsia components isn't a standard
     // or easily supported workflow. For now, always display backtraces.
     if cfg!(target_os = "fuchsia") {