gnu: ninja: Do not report files with mtime = 0 as missing.

This is a followup to 47f315a.

* gnu/packages/patches/ninja-zero-mtime.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/ninja.scm (ninja)[source]: Reinstate 'patches' field and add
  this patch.
  [arguments]: Remove 'apply-ninja-tests.patch' phase.

1 files changed, 19 insertions, 0 deletions

diff --git a/gnu/packages/patches/ninja-zero-mtime.patch b/gnu/packages/patches/ninja-zero-mtime.patch
new file mode 100644
index 0000000000..c9b9e8d798
--- /dev/null
+++ b/gnu/packages/patches/ninja-zero-mtime.patch
@@ -0,0 +1,19 @@
+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
+ }