From 004049afd50ef60860ea0d0da6f5742d66f0ac30 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 23 Nov 2018 15:45:58 +0200
Subject: More backwards modification time experimentation

---
 build2/depdb.cxx | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'build2')

diff --git a/build2/depdb.cxx b/build2/depdb.cxx
index aec2562..6f906c2 100644
--- a/build2/depdb.cxx
+++ b/build2/depdb.cxx
@@ -286,6 +286,7 @@ namespace build2
       start_ = system_clock::now ();
 #endif
 
+      /*
 #ifdef _WIN32
       //
       // On Windows there are two times, the precise time (which is what we
@@ -300,6 +301,7 @@ namespace build2
       wtime_ = mt; // Save for check below.
 #endif
 #endif
+      */
 
       fs_.put ('\0'); // The "end marker".
     }
@@ -310,6 +312,19 @@ namespace build2
     if (state_ == state::write)
     {
 #ifdef _WIN32
+      //
+      // On Windows there are two times, the precise time (which is what we
+      // get with system_clock::now()) and what we will call "filesystem time"
+      // which can lag the precise time by as much as couple of milliseconds.
+      //
+      FILETIME ft;
+      GetSystemTimeAsFileTime (&ft);
+      mt = to_timestamp (ft);
+
+#ifdef BUILD2_MTIME_CHECK
+      wtime_ = mt; // Save for check below.
+#endif
+
       auto file_mtime_h = [&to_timestamp] (const path_type& p) -> timestamp
       {
         HANDLE h (CreateFile (p.string ().c_str (),
-- 
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