[ptach timestamps] Fix lwt for macos.

Author: egorpugin

src/sw/driver/functions.cpp

@@ -44,6 +44,11 @@ void writeFileSafe(const path &fn, const String &content, const path &lock_dir)
     write_file_if_different(fn, content);
 }
 
+static auto lwt_time_t(const path &fn) {
+    auto lwt = std::chrono::clock_cast<std::chrono::system_clock>(fs::last_write_time(fn));
+    return std::chrono::system_clock::to_time_t(lwt);
+}
+
 static bool should_patch(const path &fn, const path &hf, const path &hfn)
 {
     static std::map<path, bool> to_patch;
@@ -58,10 +63,8 @@ static bool should_patch(const path &fn, const path &hf, const path &hfn)
         return to_patch[fn];
     }
     auto f = read_file(tsf);
-    fs::file_time_type::clock::duration d;
-    *(uint64_t*)&d = std::stoll(f);
-    fs::file_time_type::clock::time_point tp{d};
-    if (fs::last_write_time(fn) > tp) {
+    time_t tp = std::stoll(f);
+    if (lwt_time_t(fn) > tp) {
         return to_patch[fn] = true;
     }
     return false;
@@ -92,7 +95,7 @@ void replaceInFileOnce(const path &fn, const String &from, const String &to, con
     boost::replace_all(s, from, to);
     write_file(fn, s); //// if different?
     write_file_if_different(hfn, "");
-    write_file(tsf, std::to_string(fs::last_write_time(fn).time_since_epoch().count()));
+    write_file(tsf, std::to_string(lwt_time_t(fn)));
 }
 
 void pushFrontToFileOnce(const path &fn, const String &text, const path &lock_dir)
@@ -120,7 +123,7 @@ void pushFrontToFileOnce(const path &fn, const String &text, const path &lock_di
     s = text + "\n" + s;
     write_file(fn, s);
     write_file_if_different(hfn, "");
-    write_file(tsf, std::to_string(fs::last_write_time(fn).time_since_epoch().count()));
+    write_file(tsf, std::to_string(lwt_time_t(fn)));
 }
 
 void pushBackToFileOnce(const path &fn, const String &text, const path &lock_dir)
@@ -148,7 +151,7 @@ void pushBackToFileOnce(const path &fn, const String &text, const path &lock_dir
     s = s + "\n" + text;
     write_file(fn, s);
     write_file_if_different(hfn, "");
-    write_file(tsf, std::to_string(fs::last_write_time(fn).time_since_epoch().count()));
+    write_file(tsf, std::to_string(lwt_time_t(fn)));
 }
 
 bool patch(const path &fn, const String &patch, const path &lock_dir)