From 0b753a360b3e96b51e9c87f68157cb50b3200a35 Mon Sep 17 00:00:00 2001
From: Si Beaumont <beaumont@apple.com>
Date: Wed, 8 May 2024 13:24:34 +0100
Subject: [PATCH] Support compiling against Musl libc

---
 .../template/scaffolding.swift                            | 8 ++++++--
 Sources/Instrumentation/Locks.swift                       | 8 ++++++--
 Sources/Tracing/TracingTime.swift                         | 8 ++++++--
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/IntegrationTests/allocation-counter-tests-framework/template/scaffolding.swift b/IntegrationTests/allocation-counter-tests-framework/template/scaffolding.swift
index c956428..4652c37 100644
--- a/IntegrationTests/allocation-counter-tests-framework/template/scaffolding.swift
+++ b/IntegrationTests/allocation-counter-tests-framework/template/scaffolding.swift
@@ -28,10 +28,14 @@
 
 import AtomicCounter
 import Foundation
-#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
+#if canImport(Darwin)
 import Darwin
-#else
+#elseif canImport(Glibc)
 import Glibc
+#elseif canImport(Musl)
+import Musl
+#else
+#error("Unsupported runtime")
 #endif
 
 func waitForThreadsToQuiesce(shouldReachZero: Bool) {
diff --git a/Sources/Instrumentation/Locks.swift b/Sources/Instrumentation/Locks.swift
index 54f1d95..637493b 100644
--- a/Sources/Instrumentation/Locks.swift
+++ b/Sources/Instrumentation/Locks.swift
@@ -26,10 +26,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
+#if canImport(Darwin)
 import Darwin
-#else
+#elseif canImport(Glibc)
 import Glibc
+#elseif canImport(Musl)
+import Musl
+#else
+#error("Unsupported runtime")
 #endif
 
 /// A threading lock based on `libpthread` instead of `libdispatch`.
diff --git a/Sources/Tracing/TracingTime.swift b/Sources/Tracing/TracingTime.swift
index 3d118e5..4fe0c48 100644
--- a/Sources/Tracing/TracingTime.swift
+++ b/Sources/Tracing/TracingTime.swift
@@ -12,10 +12,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if os(Linux)
+#if canImport(Darwin)
+import Darwin
+#elseif canImport(Glibc)
 import Glibc
+#elseif canImport(Musl)
+import Musl
 #else
-import Darwin
+#error("Unsupported runtime")
 #endif
 
 @_exported import Instrumentation