Author: Pino Toscano <toscano.pino@tiscali.it>
Description: Avoid unconditional PATH_MAX usage
 Use a "safe" size in case PATH_MAX is not defined; in the end, this should not
 be used, as a allocating realpath() will be used instead.
Forwarded: no
Last-Update: 2020-04-19

--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -689,7 +689,11 @@ QFileSystemEntry QFileSystemEngine::cano
     Q_UNUSED(data);
     return QFileSystemEntry(slowCanonicalized(absoluteName(entry).filePath()));
 #else
+#ifdef PATH_MAX
     char stack_result[PATH_MAX+1];
+#else
+    char stack_result[4096+1];
+#endif
     char *resolved_name = nullptr;
 # if defined(Q_OS_DARWIN) || defined(Q_OS_ANDROID)
     // On some Android and macOS versions, realpath() will return a path even if