Adding some temporary logging to see why Linux might be failing

Author: grynspan

Sources/Testing/ExitTests/SpawnProcess.swift

@@ -57,10 +57,15 @@ private let _posix_spawn_file_actions_addclosefrom_np = symbol(named: "posix_spa
 /// consistently available across all platforms that implement the
 /// `posix_spawn()` API.
 private let _posix_spawn_file_actions_addchdir = symbol(named: "posix_spawn_file_actions_addchdir").map {
-  castCFunction(at: $0, to: (@convention(c) (UnsafeMutablePointer<P<posix_spawn_file_actions_t>>, UnsafePointer<CChar>) -> CInt).self)
+  print("!!FOUND posix_spawn_file_actions_addchdir")
+  return castCFunction(at: $0, to: (@convention(c) (UnsafeMutablePointer<P<posix_spawn_file_actions_t>>, UnsafePointer<CChar>) -> CInt).self)
 } ?? symbol(named: "posix_spawn_file_actions_addchdir_np").map {
-  castCFunction(at: $0, to: (@convention(c) (UnsafeMutablePointer<P<posix_spawn_file_actions_t>>, UnsafePointer<CChar>) -> CInt).self)
-}
+  print("!!FOUND posix_spawn_file_actions_addchdir_np")
+  return castCFunction(at: $0, to: (@convention(c) (UnsafeMutablePointer<P<posix_spawn_file_actions_t>>, UnsafePointer<CChar>) -> CInt).self)
+} ?? {
+  print("!!DID NOT FIND posix_spawn_file_actions_addchdir[_np]")
+  return nil
+}()
 #endif
 #endif
 
@@ -158,6 +163,7 @@ func spawnExecutable(
           // posix_spawn(), so set it here in the parent process and hope
           // another thread does not stomp on the change (as Foundation does.)
           // Platforms known to take this path: Amazon Linux 2, OpenBSD, QNX
+          print("!!CALLING chdir")
           guard 0 == chdir(currentDirectoryPath) else {
             throw CError(rawValue: swt_errno())
           }