Frontend: Add a more explicit -backend-option flag for passing backend command

line options, instead of leveraging the blanket -mllvm option.
 - This allows using the frontend itself without requiring the backend have
   those options available (i.e., if the target wasn't built).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128087 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 10 insertions, 3 deletions

diff --git a/lib/CodeGen/BackendUtil.cpp b/lib/CodeGen/BackendUtil.cpp
index 9897b1b1a0..ce64dc7888 100644
--- a/lib/CodeGen/BackendUtil.cpp
+++ b/lib/CodeGen/BackendUtil.cpp
@@ -248,6 +248,8 @@ bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
   }
   if (llvm::TimePassesIsEnabled)
     BackendArgs.push_back("-time-passes");
+  for (unsigned i = 0, e = CodeGenOpts.BackendOptions.size(); i != e; ++i)
+    BackendArgs.push_back(CodeGenOpts.BackendOptions[i].c_str());
   BackendArgs.push_back(0);
   llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,
                                     const_cast<char **>(&BackendArgs[0]));
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 6bfe82a8a6..59cdfe044f 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -440,7 +440,7 @@ void Clang::AddARMTargetArgs(const ArgList &Args,
 
   // Disable movt generation, if requested.
 #ifdef DISABLE_ARM_DARWIN_USE_MOVT
-  CmdArgs.push_back("-mllvm");
+  CmdArgs.push_back("-backend-option");
   CmdArgs.push_back("-arm-darwin-use-movt=0");
 #endif
 
@@ -607,10 +607,10 @@ void Clang::AddARMTargetArgs(const ArgList &Args,
 
   // Kernel code has more strict alignment requirements.
   if (KernelOrKext) {
-    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-backend-option");
     CmdArgs.push_back("-arm-long-calls");
 
-    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-backend-option");
     CmdArgs.push_back("-arm-strict-align");
   }
 }
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 2b5c289cbf..980c75200e 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -207,6 +207,10 @@ static void CodeGenOptsToArgs(const CodeGenOptions &Opts,
   }
   if (!Opts.VerifyModule)
     Res.push_back("-disable-llvm-verifier");
+  for (unsigned i = 0, e = Opts.BackendOptions.size(); i != e; ++i) {
+    Res.push_back("-backend-option");
+    Res.push_back(Opts.BackendOptions[i]);
+  }
 }
 
 static void DependencyOutputOptsToArgs(const DependencyOutputOptions &Opts,
@@ -927,6 +931,7 @@ static void ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.NoInfsFPMath = Opts.NoNaNsFPMath = Args.hasArg(OPT_cl_finite_math_only)||
                                           Args.hasArg(OPT_cl_fast_relaxed_math);
   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
+  Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);
   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);