From 2f9e8c0570ffcab5da832fc3b6bbbdbc31c3d763 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sat, 5 Sep 2015 01:17:49 +0000
Subject: [PATCH] WinCOFFObjectWriter.cpp: Roll back TimeDateStamp along
 ENABLE_TIMESTAMPS.

We want a deterministic output. GNU AS leaves it zero.

FIXME: It may be optional by its user, like llc and clang.
llvm-svn: 246905
---
 llvm/lib/MC/WinCOFFObjectWriter.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/llvm/lib/MC/WinCOFFObjectWriter.cpp b/llvm/lib/MC/WinCOFFObjectWriter.cpp
index 9058edf33254..6c696738b48b 100644
--- a/llvm/lib/MC/WinCOFFObjectWriter.cpp
+++ b/llvm/lib/MC/WinCOFFObjectWriter.cpp
@@ -1013,12 +1013,17 @@ void WinCOFFObjectWriter::writeObject(MCAssembler &Asm,
 
   Header.PointerToSymbolTable = offset;
 
+#if (ENABLE_TIMESTAMPS == 1)
   // MS LINK expects to be able to use this timestamp to implement their
   // /INCREMENTAL feature.
   std::time_t Now = time(nullptr);
   if (Now < 0 || !isUInt<32>(Now))
     Now = UINT32_MAX;
   Header.TimeDateStamp = Now;
+#else
+  // We want a deterministic output. It looks like GNU as also writes 0 in here.
+  Header.TimeDateStamp = 0;
+#endif
 
   // Write it all to disk...
   WriteFileHeader(Header);