r284638 - New clang option -mpie-copy-relocations to use copy relocations for PIE builds.

[Sriraman Tallam via cfe-commits]

Author: tmsriram
Date: Wed Oct 19 15:24:06 2016
New Revision: 284638

URL: http://llvm.org/viewvc/llvm-project?rev=284638&view=rev
Log:
New clang option -mpie-copy-relocations to use copy relocations for PIE builds.

Differential Revision: https://reviews.llvm.org/D19996

Modified:
    cfe/trunk/include/clang/Driver/Options.td
    cfe/trunk/include/clang/Frontend/CodeGenOptions.def
    cfe/trunk/lib/CodeGen/BackendUtil.cpp
    cfe/trunk/lib/Driver/Tools.cpp
    cfe/trunk/lib/Frontend/CompilerInvocation.cpp

Modified: cfe/trunk/include/clang/Driver/Options.td
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Driver/Options.td?rev=284638&r1=284637&r2=284638&view=diff
==============================================================================
--- cfe/trunk/include/clang/Driver/Options.td (original)
+++ cfe/trunk/include/clang/Driver/Options.td Wed Oct 19 15:24:06 2016
@@ -1691,6 +1691,10 @@ def mno_implicit_float : Flag<["-"], "mn
 def mimplicit_float : Flag<["-"], "mimplicit-float">, Group<m_Group>;
 def mrecip : Flag<["-"], "mrecip">, Group<m_Group>;
 def mrecip_EQ : CommaJoined<["-"], "mrecip=">, Group<m_Group>, Flags<[CC1Option]>;
+def mpie_copy_relocations : Flag<["-"], "mpie-copy-relocations">, Group<m_Group>,
+  Flags<[CC1Option]>,
+  HelpText<"Use copy relocations support for PIE builds">;
+def mno_pie_copy_relocations : Flag<["-"], "mno-pie-copy-relocations">, Group<m_Group>;
 def mx87 : Flag<["-"], "mx87">, Group<m_x86_Features_Group>;
 def m80387 : Flag<["-"], "m80387">, Alias<mx87>;
 def msse2 : Flag<["-"], "msse2">, Group<m_x86_Features_Group>;

Modified: cfe/trunk/include/clang/Frontend/CodeGenOptions.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Frontend/CodeGenOptions.def?rev=284638&r1=284637&r2=284638&view=diff
==============================================================================
--- cfe/trunk/include/clang/Frontend/CodeGenOptions.def (original)
+++ cfe/trunk/include/clang/Frontend/CodeGenOptions.def Wed Oct 19 15:24:06 2016
@@ -252,6 +252,9 @@ VALUE_CODEGENOPT(EmitCheckPathComponents
 /// Whether to report the hotness of the code region for optimization remarks.
 CODEGENOPT(DiagnosticsWithHotness, 1, 0)
 
+/// Whether copy relocations support is available when building as PIE.
+CODEGENOPT(PIECopyRelocations, 1, 0)
+
 #undef CODEGENOPT
 #undef ENUM_CODEGENOPT
 #undef VALUE_CODEGENOPT

Modified: cfe/trunk/lib/CodeGen/BackendUtil.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/BackendUtil.cpp?rev=284638&r1=284637&r2=284638&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/BackendUtil.cpp (original)
+++ cfe/trunk/lib/CodeGen/BackendUtil.cpp Wed Oct 19 15:24:06 2016
@@ -595,6 +595,8 @@ void EmitAssemblyHelper::CreateTargetMac
   Options.MCOptions.MCNoExecStack = CodeGenOpts.NoExecStack;
   Options.MCOptions.MCIncrementalLinkerCompatible =
       CodeGenOpts.IncrementalLinkerCompatible;
+  Options.MCOptions.MCPIECopyRelocations =
+      CodeGenOpts.PIECopyRelocations;
   Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
   Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
   Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=284638&r1=284637&r2=284638&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Wed Oct 19 15:24:06 2016
@@ -4499,6 +4499,12 @@ void Clang::ConstructJob(Compilation &C,
     CmdArgs.push_back("-mms-bitfields");
   }
 
+  if (Args.hasFlag(options::OPT_mpie_copy_relocations,
+                   options::OPT_mno_pie_copy_relocations,
+                   false)) {
+    CmdArgs.push_back("-mpie-copy-relocations");
+  }
+
   // This is a coarse approximation of what llvm-gcc actually does, both
   // -fasynchronous-unwind-tables and -fnon-call-exceptions interact in more
   // complicated ways.

Modified: cfe/trunk/lib/Frontend/CompilerInvocation.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Frontend/CompilerInvocation.cpp?rev=284638&r1=284637&r2=284638&view=diff
==============================================================================
--- cfe/trunk/lib/Frontend/CompilerInvocation.cpp (original)
+++ cfe/trunk/lib/Frontend/CompilerInvocation.cpp Wed Oct 19 15:24:06 2016
@@ -586,6 +586,8 @@ static bool ParseCodeGenArgs(CodeGenOpti
   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
   Opts.IncrementalLinkerCompatible =
       Args.hasArg(OPT_mincremental_linker_compatible);
+  Opts.PIECopyRelocations =
+      Args.hasArg(OPT_mpie_copy_relocations);
   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);