Work around a design defect in Ninja whereby a zero mtime is used to
denote missing files (we happen to produce files that have a zero mtime
and yet really do exist.)

--- ninja-1.5.3/src/disk_interface.cc	2014-11-24 18:37:47.000000000 +0100
+++ ninja-1.5.3/src/disk_interface.cc	2015-07-18 23:20:38.572290139 +0200
@@ -194,6 +194,12 @@ TimeStamp RealDiskInterface::Stat(const
     }
     return -1;
   }
+
+  if (st.st_mtime == 0)
+    // All the code assumes that mtime == 0 means "file missing".  Here we
+    // know the file is not missing, so tweak the mtime.
+    st.st_mtime = 1;
+
   return st.st_mtime;
 #endif
 }
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<div class='path'>path: <a href='/guix/log/?id=faf8ba9b43323dc61988a368690b20008611fc87'>root</a>/<a href='/guix/log/nix?id=faf8ba9b43323dc61988a368690b20008611fc87'>nix</a>/<a href='/guix/log/nix/boost?id=faf8ba9b43323dc61988a368690b20008611fc87'>boost</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/nix/boost?id=faf8ba9b43323dc61988a368690b20008611fc87&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-06-24 19:55:22 +0100'>2020-06-24</span></td><td><a href='/guix/commit/nix/boost?id=cd43b55da7ab51c996a7a3449c78f2a493616106'>nix: Tweak .gitignore files.</a><span class='msg-avail'>...<span class='msg-tooltip'>Remove .gitignore entries where they match source files that are tracked in
Git.  This is relevant to me at least, as some code searching tools use
.gitignore files and will ignore matched files.
</span></span></td><td>Christopher Baines</td></tr>