[WebAssembly] Include libclang_rt.builtins in the standard way

[sbc100]

• fix tests

[sbc100]

• remove debugging

[dschuff]

lib/Driver/ToolChain.cpp

318

Is this logic intended to replace what was removed from CommonArgs.cpp? Should there be an assert here too?

[sbc100]

lib/Driver/ToolChain.cpp

318

Just didn't see the point of that assert. Can you see what the intention might be? I don't see why AddRunTimeLibs() should be callable for any/all triples, do you? I would have had to add llvm::Triple::Unknown to the list of supported OSs, which seemed strange.

[dschuff]

lib/Driver/ToolChain.cpp

318

I assume it was just because different OSes have different conventions for the rtlib, and if the OS is unknown and/or there's no particular support, then there might be a bug. But OTOH it doesn't seem bad to have some reasonable default either. For that matter it also seems a little weird that now we are letting the binary format be the determining thing for the Compiler-RT path. But I guess the real issue is that none of the OS, arch, or binary format is really the determining thing; it's really the toolchain/SDK or distribution of the compiler that determines what the path should be, and that can be affected by a lot of other things (e.g. is it the "system" compiler or not, is it a cross compiler, etc). So... yeah I think having this as a default makes as much sense as asserting, and when someone needs to add support for their distribution, then I suppose it's on them to refactor as needed and keep the tests working.

[sbc100]

• remove debugging
• git squash commit for startup_libs.
• update test expectations

lib/Driver/ToolChain.cpp

static StringRef getArchNameForCompilerRTLib(const ToolChain &TC,
   if (TC.getArch() == llvm::Triple::x86 && Triple.isAndroid())
     return "i686";
 
   return llvm::Triple::getArchTypeName(TC.getArch());
 }
 
 std::string ToolChain::getCompilerRTPath() const {
   SmallString<128> Path(getDriver().ResourceDir);
-  StringRef OSLibName = Triple.isOSFreeBSD() ? "freebsd" : getOS();
+  StringRef OSLibName;
+  if (Triple.isOSFreeBSD())
+    OSLibName = "freebsd";
+  else if (Triple.isOSBinFormatWasm())
+    OSLibName = "wasm";
+  else
+    OSLibName = getOS();
   llvm::sys::path::append(Path, "lib", OSLibName);
   return Path.str();
 }
 
 std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
                                      bool Shared) const {
   const llvm::Triple &TT = getTriple();
   const char *Env = TT.isAndroid() ? "-android" : "";

lib/Driver/ToolChains/CommonArgs.cpp

if (isAndroid && !StaticLibgcc)
     CmdArgs.push_back("-ldl");
 }
 
 void tools::AddRunTimeLibs(const ToolChain &TC, const Driver &D,
                            ArgStringList &CmdArgs, const ArgList &Args) {
   // Make use of compiler-rt if --rtlib option is used
   ToolChain::RuntimeLibType RLT = TC.GetRuntimeLibType(Args);
 
+  printf("%d\n", TC.getTriple().getOS());
   switch (RLT) {
   case ToolChain::RLT_CompilerRT:
-    switch (TC.getTriple().getOS()) {
-    default:
-      llvm_unreachable("unsupported OS");
-    case llvm::Triple::Win32:
-    case llvm::Triple::Linux:
-    case llvm::Triple::Fuchsia:
-      CmdArgs.push_back(TC.getCompilerRTArgString(Args, "builtins"));
-      break;
-    }
-    break;
   case ToolChain::RLT_Libgcc:
     // Make sure libgcc is not used under MSVC environment by default
     if (TC.getTriple().isKnownWindowsMSVCEnvironment()) {
       // Issue error diagnostic if libgcc is explicitly specified
       // through command line as --rtlib option argument.
       if (Args.hasArg(options::OPT_rtlib_EQ)) {
         TC.getDriver().Diag(diag::err_drv_unsupported_rtlib_for_platform)
             << Args.getLastArg(options::OPT_rtlib_EQ)->getValue() << "MSVC";

lib/Driver/ToolChains/WebAssembly.cpp

if (ToolChain.ShouldLinkCXXStdlib(Args))
       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
 
     if (Args.hasArg(options::OPT_pthread))
       CmdArgs.push_back("-lpthread");
 
     CmdArgs.push_back("-allow-undefined-file");
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("wasm.syms")));
     CmdArgs.push_back("-lc");
-    CmdArgs.push_back("-lcompiler_rt");
+    AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
   }
 
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());
 
   C.addCommand(llvm::make_unique<Command>(JA, *this, Linker, CmdArgs, Inputs));
 }