[clang][driver][AIX] Set compiler-rt as default rtlib

Reviewed By: hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D88182

Author: daltenty

clang/lib/Driver/ToolChain.cpp

@@ -391,6 +391,8 @@ StringRef ToolChain::getOSLibName() const {
     return "openbsd";
   case llvm::Triple::Solaris:
     return "sunos";
+  case llvm::Triple::AIX:
+    return "aix";
   default:
     return getOS();
   }

clang/lib/Driver/ToolChains/AIX.cpp

@@ -156,6 +156,8 @@ void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
 
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
+    AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
+
     // Support POSIX threads if "-pthreads" or "-pthread" is present.
     if (Args.hasArg(options::OPT_pthreads, options::OPT_pthread))
       CmdArgs.push_back("-lpthreads");
@@ -228,6 +230,10 @@ ToolChain::CXXStdlibType AIX::GetDefaultCXXStdlibType() const {
   return ToolChain::CST_Libcxx;
 }
 
+ToolChain::RuntimeLibType AIX::GetDefaultRuntimeLibType() const {
+  return ToolChain::RLT_CompilerRT;
+}
+
 auto AIX::buildAssembler() const -> Tool * { return new aix::Assembler(*this); }
 
 auto AIX::buildLinker() const -> Tool * { return new aix::Linker(*this); }

clang/lib/Driver/ToolChains/AIX.h

@@ -72,6 +72,8 @@ class LLVM_LIBRARY_VISIBILITY AIX : public ToolChain {
 
   CXXStdlibType GetDefaultCXXStdlibType() const override;
 
+  RuntimeLibType GetDefaultRuntimeLibType() const override;
+
 protected:
   Tool *buildAssembler() const override;
   Tool *buildLinker() const override;