Index: lib/Driver/ToolChains/Clang.cpp
===================================================================
--- lib/Driver/ToolChains/Clang.cpp
+++ lib/Driver/ToolChains/Clang.cpp
@@ -21,6 +21,7 @@
 #include "MSP430.h"
 #include "InputInfo.h"
 #include "PS4CPU.h"
+#include "RISCVToolchain.h"
 #include "clang/Basic/CharInfo.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/ObjCRuntime.h"
@@ -1799,6 +1800,13 @@
 
   CmdArgs.push_back("-target-abi");
   CmdArgs.push_back(ABIName);
+
+  // Passing small data section limitaion.
+  StringRef G = toolchains::RISCVToolChain::getSmallDataThreshold(Args, Triple);
+  if (!G.empty()) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back(Args.MakeArgString("-riscv-ssection-threshold=" + G));
+  }
 }
 
 void Clang::AddSparcTargetArgs(const ArgList &Args,
Index: lib/Driver/ToolChains/RISCVToolchain.h
===================================================================
--- lib/Driver/ToolChains/RISCVToolchain.h
+++ lib/Driver/ToolChains/RISCVToolchain.h
@@ -32,7 +32,11 @@
   addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
 
+  static StringRef getSmallDataThreshold(const llvm::opt::ArgList &Args,
+                                         const llvm::Triple &Triple);
+
 protected:
+  bool HasNativeLLVMSupport() const override { return true; }
   Tool *buildLinker() const override;
 
 private:
Index: lib/Driver/ToolChains/RISCVToolchain.cpp
===================================================================
--- lib/Driver/ToolChains/RISCVToolchain.cpp
+++ lib/Driver/ToolChains/RISCVToolchain.cpp
@@ -86,6 +86,24 @@
   return SysRootDir;
 }
 
+StringRef RISCVToolChain::getSmallDataThreshold(const ArgList &Args,
+                                                const llvm::Triple &Triple) {
+  StringRef Gn = "";
+  if (Arg *A = Args.getLastArg(options::OPT_G)) {
+    Gn = A->getValue();
+  // Not support linker relaxation for PIC.
+  } else if (Args.getLastArg(options::OPT_shared, options::OPT_fpic,
+                             options::OPT_fPIC)) {
+    Gn = "0";
+  // Not support linker relaxation for RV64 with large code model.
+  } else if (Args.getLastArgValue(options::OPT_mcmodel_EQ).equals_lower("large") &&
+             (Triple.getArch() == llvm::Triple::riscv64)) {
+    Gn = "0";
+  }
+
+  return Gn;
+}
+
 void RISCV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                  const InputInfo &Output,
                                  const InputInfoList &Inputs,
@@ -114,6 +132,22 @@
                   {options::OPT_T_Group, options::OPT_e, options::OPT_s,
                    options::OPT_t, options::OPT_Z_Flag, options::OPT_r});
 
+  if (D.isUsingLTO()) {
+    assert(!Inputs.empty() && "Must have at least one input.");
+    AddGoldPlugin(ToolChain, Args, CmdArgs, Output, Inputs[0],
+                  D.getLTOMode() == LTOK_Thin);
+
+    // Passing small data section limitaion.
+    StringRef G = toolchains::RISCVToolChain::getSmallDataThreshold(Args, ToolChain.getTriple());
+    if (!G.empty()) {
+      if (Args.getLastArgValue(options::OPT_fuse_ld_EQ).equals_lower("lld")) {
+        CmdArgs.push_back("-mllvm");
+        CmdArgs.push_back(Args.MakeArgString("-riscv-ssection-threshold=" + G));
+      } else
+        CmdArgs.push_back(Args.MakeArgString("-plugin-opt=-riscv-ssection-threshold=" + G));
+    }
+  }
+
   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
 
   // TODO: add C++ includes and libs if compiling C++.
Index: test/Driver/riscv-features.c
===================================================================
--- test/Driver/riscv-features.c
+++ test/Driver/riscv-features.c
@@ -11,3 +11,37 @@
 // NO-RELAX: "-target-feature" "-relax"
 // DEFAULT-NOT: "-target-feature" "+relax"
 // DEFAULT-NOT: "-target-feature" "-relax"
+
+/// Small data section limitaion setting.
+// RUN: %clang -target riscv32 -### -S %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV32 %s
+// CHECK-RV32-NOT: "-mllvm" "-riscv-ssection-threshold"
+// RUN: %clang -target riscv64 -### -S %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV64 %s
+// CHECK-RV64-NOT: "-mllvm" "-riscv-ssection-threshold"
+// RUN: %clang -target riscv32 -flto -### %s \
+// RUN:     -G 16 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV32-G16-LTO %s
+// CHECK-RV32-G16-LTO: "-plugin-opt=-riscv-ssection-threshold=16"
+// RUN: %clang -target riscv32 -### %s \
+// RUN:     -G 0 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV32-G0 %s
+// CHECK-RV32-G0: "-mllvm" "-riscv-ssection-threshold=0"
+// RUN: %clang -target riscv64 -mcmodel=large -### -S %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV64-LARGE %s
+// CHECK-RV64-LARGE: "-mllvm" "-riscv-ssection-threshold=0"
+// RUN: %clang -target riscv32 -fpic -### -S %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV32-PIC %s
+// CHECK-RV32-PIC: "-mllvm" "-riscv-ssection-threshold=0"
+// RUN: %clang -target riscv64 -fpic -### -S %s \
+// RUN:     -G 16 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV64-PIC-G16 %s
+// CHECK-RV64-PIC-G16: "-mllvm" "-riscv-ssection-threshold=16"
+// RUN: %clang -target riscv32 -### -S %s \
+// RUN:     -G 16 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV32-G16 %s
+// CHECK-RV32-G16: "-mllvm" "-riscv-ssection-threshold=16"
+// RUN: %clang -target riscv64 -mcmodel=large -### -S %s \
+// RUN:     -G 16 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV64-LARGE-G16 %s
+// CHECK-RV64-LARGE-G16: "-mllvm" "-riscv-ssection-threshold=16"