r339720 - SafeStack: Disable Darwin support

[Vlad Tsyrklevich via cfe-commits]

Author: vlad.tsyrklevich
Date: Tue Aug 14 12:50:41 2018
New Revision: 339720

URL: http://llvm.org/viewvc/llvm-project?rev=339720&view=rev
Log:
SafeStack: Disable Darwin support

Summary:
Darwin support does not appear to be used as evidenced by the fact that
the runtime has never supported non-trivial programs.

Reviewers: pcc, kubamracek

Reviewed By: pcc

Subscribers: cfe-commits, kcc

Differential Revision: https://reviews.llvm.org/D50724

Modified:
    cfe/trunk/lib/Driver/ToolChains/Darwin.cpp

Modified: cfe/trunk/lib/Driver/ToolChains/Darwin.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/Darwin.cpp?rev=339720&r1=339719&r2=339720&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/Darwin.cpp (original)
+++ cfe/trunk/lib/Driver/ToolChains/Darwin.cpp Tue Aug 14 12:50:41 2018
@@ -509,15 +509,6 @@ void darwin::Linker::ConstructJob(Compil
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
     getMachOToolChain().addStartObjectFileArgs(Args, CmdArgs);
 
-  // SafeStack requires its own runtime libraries
-  // These libraries should be linked first, to make sure the
-  // __safestack_init constructor executes before everything else
-  if (getToolChain().getSanitizerArgs().needsSafeStackRt()) {
-    getMachOToolChain().AddLinkRuntimeLib(Args, CmdArgs,
-                                          "libclang_rt.safestack_osx.a",
-                                          toolchains::Darwin::RLO_AlwaysLink);
-  }
-
   Args.AddAllArgs(CmdArgs, options::OPT_L);
 
   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
@@ -2297,7 +2288,6 @@ SanitizerMask Darwin::getSupportedSaniti
   if (isTargetMacOS()) {
     if (!isMacosxVersionLT(10, 9))
       Res |= SanitizerKind::Vptr;
-    Res |= SanitizerKind::SafeStack;
     if (IsX86_64)
       Res |= SanitizerKind::Thread;
   } else if (isTargetIOSSimulator() || isTargetTvOSSimulator()) {