From b585df804fed5b2070669e3110561adc4a403923 Mon Sep 17 00:00:00 2001
From: Aaron Hill <aa1ronham@gmail.com>
Date: Mon, 9 Mar 2020 13:16:59 -0400
Subject: [PATCH] Disable `mmap` on macOS

See https://github.com/rust-lang/rust/pull/45866 for more details
---
 crates/backtrace-sys/build.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crates/backtrace-sys/build.rs b/crates/backtrace-sys/build.rs
index 564f23a91..6c500536d 100644
--- a/crates/backtrace-sys/build.rs
+++ b/crates/backtrace-sys/build.rs
@@ -36,7 +36,9 @@ fn main() {
 
     // `mmap` does not exist on Windows, so we use
     // the less efficient `read`-based code.
-    if target.contains("windows") {
+    // Using `mmap` on macOS causes weird isseus - see
+    // https://github.com/rust-lang/rust/pull/45866
+    if target.contains("windows") || target.contains("macos") {
         build.file("src/libbacktrace/read.c");
     } else {
         build.file("src/libbacktrace/mmapio.c");