Fix debug logging for Linux.

Author: mluisbrown

Sources/ComposableArchitecture/Internal/RuntimeWarnings.swift

@@ -1,26 +1,39 @@
-#if DEBUG && canImport(os) 
-  import os
+#if DEBUG
+  #if canImport(os)
+    import os
 
-  // NB: Xcode runtime warnings offer a much better experience than traditional assertions and
-  //     breakpoints, but Apple provides no means of creating custom runtime warnings ourselves.
-  //     To work around this, we hook into SwiftUI's runtime issue delivery mechanism, instead.
-  //
-  // Feedback filed: https://gist.github.com/stephencelis/a8d06383ed6ccde3e5ef5d1b3ad52bbc
-  let rw = (
-    dso: { () -> UnsafeMutableRawPointer in
-      let count = _dyld_image_count()
-      for i in 0..<count {
-        if let name = _dyld_get_image_name(i) {
-          let swiftString = String(cString: name)
-          if swiftString.hasSuffix("/SwiftUI") {
-            if let header = _dyld_get_image_header(i) {
-              return UnsafeMutableRawPointer(mutating: UnsafeRawPointer(header))
+    // NB: Xcode runtime warnings offer a much better experience than traditional assertions and
+    //     breakpoints, but Apple provides no means of creating custom runtime warnings ourselves.
+    //     To work around this, we hook into SwiftUI's runtime issue delivery mechanism, instead.
+    //
+    // Feedback filed: https://gist.github.com/stephencelis/a8d06383ed6ccde3e5ef5d1b3ad52bbc
+    let rw = (
+      dso: { () -> UnsafeMutableRawPointer in
+        let count = _dyld_image_count()
+        for i in 0..<count {
+          if let name = _dyld_get_image_name(i) {
+            let swiftString = String(cString: name)
+            if swiftString.hasSuffix("/SwiftUI") {
+              if let header = _dyld_get_image_header(i) {
+                return UnsafeMutableRawPointer(mutating: UnsafeRawPointer(header))
+              }
             }
           }
         }
-      }
-      return UnsafeMutableRawPointer(mutating: #dsohandle)
-    }(),
-    log: OSLog(subsystem: "com.apple.runtime-issues", category: "ComposableArchitecture")
-  )
+        return UnsafeMutableRawPointer(mutating: #dsohandle)
+      }(),
+      log: OSLog(subsystem: "com.apple.runtime-issues", category: "ComposableArchitecture")
+    )
+
+  #else
+    let rw = (dso: (), log: ())
+
+    enum OSLogType {
+      case fault
+    }
+
+    func os_log(_ type: OSLogType, dso: Void, log: Void, _ message: String, _ args: CVarArg...) {
+      print(String(format: message, arguments: args))
+    }
+  #endif
 #endif

Sources/ComposableArchitecture/Reducer.swift

@@ -1,7 +1,7 @@
 import CasePaths
 import Foundation
 
-#if DEBUG
+#if DEBUG && canImport(os)
   import os
 #endif
 

Sources/ComposableArchitecture/Store.swift

@@ -1,7 +1,7 @@
 import Foundation
 import ReactiveSwift
 
-#if DEBUG
+#if DEBUG && canImport(os)
   import os
 #endif
 

Sources/ComposableArchitecture/SwiftUI/SwitchStore.swift

@@ -1,7 +1,7 @@
 #if canImport(SwiftUI)
 import SwiftUI
 
-#if DEBUG
+#if DEBUG && canImport(os)
   import os
 #endif