Add test for verifying exception handling for emscripten builds

lib/Interpreter/exports.ld

@@ -2,6 +2,7 @@
 -Wl,--export=_ZN4llvm11raw_ostream16SetBufferAndModeEPcmNS0_10BufferKindE
 -Wl,--export=_ZN4llvm11raw_ostream5writeEPKcm
 -Wl,--export=_ZN4llvm11raw_ostreamD2Ev
+-Wl,--export=_ZN4llvm11raw_ostreamlsEm
 -Wl,--export=_ZN4llvm15SmallVectorBaseIjE8grow_podEPvmm
 -Wl,--export=_ZN4llvm15allocate_bufferEmm
 -Wl,--export=_ZN4llvm21logAllUnhandledErrorsENS_5ErrorERNS_11raw_ostreamENS_5TwineE

unittests/CppInterOp/CMakeLists.txt

@@ -43,6 +43,7 @@ if(EMSCRIPTEN)
   # --preload-file ${SYSROOT_PATH}/include@/include:
   # Preloads the system include directory into the Emscripten virtual filesystem to make headers accessible at runtime.
   target_link_options(CppInterOpTests
+    PUBLIC "SHELL: -fexceptions"
     PUBLIC "SHELL: -s MAIN_MODULE=1"
     PUBLIC "SHELL: -s WASM_BIGINT"
     PUBLIC "SHELL: -s ALLOW_MEMORY_GROWTH=1"

unittests/CppInterOp/InterpreterTest.cpp

@@ -104,6 +104,33 @@ TEST(InterpreterTest, Process) {
   clang_Interpreter_dispose(CXI);
 }
 
+TEST(InterpreterTest, EmscriptenExceptionHandling) {
+#ifndef EMSCRIPTEN
+  GTEST_SKIP() << "This test is intended to check exception handling for Emscripten builds.";
+#endif
+
+  std::vector<const char*> Args = {
+    "-std=c++20",
+    "-v",
+    "-fexceptions",
+    "-fcxx-exceptions",
+    "-mllvm", "-enable-emscripten-cxx-exceptions",
+    "-mllvm", "-enable-emscripten-sjlj"
+  };
+
+  Cpp::CreateInterpreter(Args);
+
+  const char* tryCatchCode = R"(
+    try {
+      throw 1;
+    } catch (...) {
+      0;
+    }
+  )";
+
+  EXPECT_TRUE(Cpp::Process(tryCatchCode) == 0);
+}
+
 TEST(InterpreterTest, CreateInterpreter) {
   auto* I = Cpp::CreateInterpreter();
   EXPECT_TRUE(I);