Add patch for enabling exception handling in xeus-cpp-lite

Author: anutosh491

recipes/recipes_emscripten/llvm/patches/enable_exception_handling.patch

@@ -0,0 +1,67 @@
+diff --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
+index f91563dd0378..37cf3b62e6ec 100644
+--- a/clang/lib/Interpreter/Interpreter.cpp
++++ b/clang/lib/Interpreter/Interpreter.cpp
+@@ -142,6 +142,48 @@ CreateCI(const llvm::opt::ArgStringList &Argv) {
+   return std::move(Clang);
+ }
+ 
++static llvm::Error HandleFrontendOptions(const CompilerInstance &CI) {
++  const auto &FrontendOpts = CI.getFrontendOpts();
++
++  if (FrontendOpts.ShowHelp) {
++    driver::getDriverOptTable().printHelp(
++        llvm::outs(), "clang -cc1 [options] file...",
++        "LLVM 'Clang' Compiler: http://clang.llvm.org",
++        /*ShowHidden=*/false, /*ShowAllAliases=*/false,
++        llvm::opt::Visibility(driver::options::CC1Option));
++    return llvm::createStringError(llvm::errc::not_supported, "Help displayed");
++  }
++
++  if (FrontendOpts.ShowVersion) {
++    llvm::cl::PrintVersionMessage();
++    return llvm::createStringError(llvm::errc::not_supported,
++                                   "Version displayed");
++  }
++
++  if (!FrontendOpts.LLVMArgs.empty()) {
++    unsigned NumArgs = FrontendOpts.LLVMArgs.size();
++    auto Args = std::make_unique<const char *[]>(NumArgs + 2);
++    Args[0] = "clang-repl (LLVM option parsing)";
++    for (unsigned i = 0; i != NumArgs; ++i) {
++      Args[i + 1] = FrontendOpts.LLVMArgs[i].c_str();
++      // remove the leading '-' from the option name
++      if (Args[i + 1][0] == '-') {
++        auto *option = static_cast<llvm::cl::opt<bool> *>(
++            llvm::cl::getRegisteredOptions()[Args[i + 1] + 1]);
++        if (option) {
++          option->setInitialValue(true);
++        } else {
++          llvm::errs() << "Unknown LLVM option: " << Args[i + 1] << "\n";
++        }
++      }
++    }
++    Args[NumArgs + 1] = nullptr;
++    llvm::cl::ParseCommandLineOptions(NumArgs + 1, Args.get());
++  }
++
++  return llvm::Error::success();
++}
++
+ } // anonymous namespace
+ 
+ namespace clang {
+@@ -452,7 +494,12 @@ const char *const Runtimes = R"(
+ 
+ llvm::Expected<std::unique_ptr<Interpreter>>
+ Interpreter::create(std::unique_ptr<CompilerInstance> CI) {
+-  llvm::Error Err = llvm::Error::success();
++
++  llvm::Error Err = HandleFrontendOptions(*CI);
++  if (Err) {
++    return std::move(Err);
++  }
++
+   auto Interp =
+       std::unique_ptr<Interpreter>(new Interpreter(std::move(CI), Err));
+   if (Err)

recipes/recipes_emscripten/llvm/recipe.yaml

@@ -13,6 +13,7 @@ source:
   - patches/cross_compile.patch
   - patches/shift_temporary_files_to_tmp_dir.patch
   - patches/wasm-ld.patch
+  - patches/enable_exception_handling.patch
 
 build:
   number: 0