From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Sat, 5 Sep 2015 01:17:49 +0000 (+0000)
Subject: WinCOFFObjectWriter.cpp: Roll back TimeDateStamp along ENABLE_TIMESTAMPS.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=455c3d818a238de95bbc72cbd24d6642fae61311

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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246905 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/MC/WinCOFFObjectWriter.cpp b/lib/MC/WinCOFFObjectWriter.cpp
index 9058edf3325..6c696738b48 100644
--- a/lib/MC/WinCOFFObjectWriter.cpp
+++ b/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);