commit a478b0a199f4928041390d1f35dd5e226936b42c
Author: Ryan Prichard <rprichard@google.com>
Date:   Tue Mar 9 14:20:45 2021 -0800

    [Android] Default to --rtlib=compiler-rt
    
    By default, the driver uses the compiler-rt builtins and links with
    -l:libunwind.a.
    
    Restore the previous behavior by passing --rtlib=libgcc.
    
    Reviewed By: danalbert
    
    Differential Revision: https://reviews.llvm.org/D96404

diff --git a/llvm-project/clang/lib/Driver/ToolChains/Linux.cpp b/llvm-project/clang/lib/Driver/ToolChains/Linux.cpp
index 93a56be6a7a4..ad98013dd4f0 100644
--- a/llvm-project/clang/lib/Driver/ToolChains/Linux.cpp
+++ b/llvm-project/clang/lib/Driver/ToolChains/Linux.cpp
@@ -363,6 +363,12 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
   }
 }
 
+ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const {
+  if (getTriple().isAndroid())
+    return ToolChain::RLT_CompilerRT;
+  return Generic_ELF::GetDefaultRuntimeLibType();
+}
+
 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const {
   if (getTriple().isAndroid())
     return ToolChain::CST_Libcxx;
diff --git a/llvm-project/clang/lib/Driver/ToolChains/Linux.h b/llvm-project/clang/lib/Driver/ToolChains/Linux.h
index a45236bc10d3..05e01a208456 100644
--- a/llvm-project/clang/lib/Driver/ToolChains/Linux.h
+++ b/llvm-project/clang/lib/Driver/ToolChains/Linux.h
@@ -35,6 +35,7 @@ public:
                          llvm::opt::ArgStringList &CC1Args) const override;
   void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
+  RuntimeLibType GetDefaultRuntimeLibType() const override;
   CXXStdlibType GetDefaultCXXStdlibType() const override;
   bool isPIEDefault() const override;
   bool isNoExecStackDefault() const override;