[RISCV] Default enable RISCV linker relaxation

Differential Revision: https://reviews.llvm.org/D47127

llvm-svn: 354222

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
index e40911f4dbf..b5cee381e1f 100644
--- a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
@@ -364,6 +364,18 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const ArgList &Args,
     getExtensionFeatures(D, Args, Features, MArch, OtherExts);
   }
 
+  // -mrelax is default, unless -mno-relax is specified.
+  bool Relax = true;
+  if (auto *A = Args.getLastArg(options::OPT_mrelax, options::OPT_mno_relax)) {
+    if (A->getOption().matches(options::OPT_mno_relax)) {
+      Relax = false;
+      Features.push_back("-relax");
+    }
+  }
+
+  if (Relax)
+    Features.push_back("+relax");
+
   // Now add any that the user explicitly requested on the command line,
   // which may override the defaults.
   handleTargetFeaturesGroup(Args, Features, options::OPT_m_riscv_Features_Group);