Merge branch 'bug/SDK-3848_revert-filesystem-changes-breaking-build-o…

…n-macos-10-13-x86' into 'develop'

SDK-3848: Revert std::filesystem changes breaking macOS 10.13 x86 build

Closes SDK-3848

See merge request sdk/sdk!5455

src/autocomplete.cpp

@@ -25,8 +25,12 @@
 #include <mega/megaclient.h>
 #include <cassert>
 #include <algorithm>
-#include <filesystem>
-namespace fs = std::filesystem;
+
+#if !defined(__MINGW32__) && !defined(__ANDROID__) && (!defined(__GNUC__) || (__GNUC__*100+__GNUC_MINOR__) >= 503)
+    #define HAVE_FILESYSTEM
+    #include <filesystem>
+    namespace fs = std::filesystem;
+#endif
 
 namespace mega {
 namespace autocomplete {
@@ -592,6 +596,7 @@ bool LocalFS::addCompletions(ACState& s)
 {
     if (s.atCursor())
     {
+#ifdef HAVE_FILESYSTEM
         fs::path searchPath = fs::u8path(s.word().s + (s.word().s.empty() || (s.word().s.back() == '\\'  || s.word().s.back() == '/' ) ? "*" : ""));
 #ifdef WIN32
         char sep = (!s.word().s.empty() && s.word().s.find('/') != string::npos ) ?'/':'\\';
@@ -628,6 +633,9 @@ bool LocalFS::addCompletions(ACState& s)
                 }
             }
         }
+#else
+// todo: implement local directory listing for any platforms without std::filsystem, if it turns out to be needed
+#endif
         return true;
     }
     else