1 files changed, 15 insertions, 19 deletions

diff --git a/src/libstd/panicking.rs b/src/libstd/panicking.rs
index 28fb4024404..638ce1679b8 100644
--- a/src/libstd/panicking.rs
+++ b/src/libstd/panicking.rs
@@ -15,9 +15,11 @@ use crate::intrinsics;
 use crate::mem;
 use crate::ptr;
 use crate::raw;
+use crate::sync::atomic::{AtomicBool, Ordering};
 use crate::sys::stdio::panic_output;
 use crate::sys_common::rwlock::RWLock;
-use crate::sys_common::{thread_info, util, backtrace};
+use crate::sys_common::{thread_info, util};
+use crate::sys_common::backtrace::{self, RustBacktrace};
 use crate::thread;
 
 #[cfg(not(test))]
@@ -158,16 +160,10 @@ pub fn take_hook() -> Box<dyn Fn(&PanicInfo<'_>) + 'static + Sync + Send> {
 fn default_hook(info: &PanicInfo<'_>) {
     // If this is a double panic, make sure that we print a backtrace
     // for this panic. Otherwise only print it if logging is enabled.
-    let log_backtrace = if cfg!(feature = "backtrace") {
-        let panics = update_panic_count(0);
-
-        if panics >= 2 {
-            Some(backtrace_rs::PrintFmt::Full)
-        } else {
-            backtrace::log_enabled()
-        }
+    let backtrace_env = if update_panic_count(0) >= 2 {
+        RustBacktrace::Print(backtrace_rs::PrintFmt::Full)
     } else {
-        None
+        backtrace::rust_backtrace_env()
     };
 
     // The current implementation always returns `Some`.
@@ -187,16 +183,16 @@ fn default_hook(info: &PanicInfo<'_>) {
         let _ = writeln!(err, "thread '{}' panicked at '{}', {}",
                          name, msg, location);
 
-        if cfg!(feature = "backtrace") {
-            use crate::sync::atomic::{AtomicBool, Ordering};
-
-            static FIRST_PANIC: AtomicBool = AtomicBool::new(true);
+        static FIRST_PANIC: AtomicBool = AtomicBool::new(true);
 
-            if let Some(format) = log_backtrace {
-                let _ = backtrace::print(err, format);
-            } else if FIRST_PANIC.compare_and_swap(true, false, Ordering::SeqCst) {
-                let _ = writeln!(err, "note: run with `RUST_BACKTRACE=1` \
-                                       environment variable to display a backtrace.");
+        match backtrace_env {
+            RustBacktrace::Print(format) => drop(backtrace::print(err, format)),
+            RustBacktrace::Disabled => {}
+            RustBacktrace::RuntimeDisabled => {
+                if FIRST_PANIC.swap(false, Ordering::SeqCst) {
+                    let _ = writeln!(err, "note: run with `RUST_BACKTRACE=1` \
+                                           environment variable to display a backtrace.");
+                }
             }
         }
     };