Build llvm with -fexceptions flag

recipes/recipes_emscripten/llvm/build.sh

@@ -15,18 +15,21 @@ emcmake cmake ${CMAKE_ARGS} -S ../llvm -B .         \
     -DLLVM_HOST_TRIPLE=wasm32-unknown-emscripten    \
     -DLLVM_TARGETS_TO_BUILD="WebAssembly"           \
     -DLLVM_ENABLE_ASSERTIONS=ON                     \
+    -DLLVM_ENABLE_EH=ON                             \
+    -DLLVM_ENABLE_RTTI=ON                           \
     -DLLVM_INCLUDE_BENCHMARKS=OFF                   \
     -DLLVM_INCLUDE_EXAMPLES=OFF                     \
     -DLLVM_INCLUDE_TESTS=OFF                        \
     -DLLVM_ENABLE_LIBEDIT=OFF                       \
     -DLLVM_ENABLE_PROJECTS="clang;lld"              \
+    -DCMAKE_VERBOSE_MAKEFILE=ON                     \
     -DLLVM_ENABLE_THREADS=OFF                       \
     -DLLVM_ENABLE_ZSTD=OFF                          \
     -DLLVM_ENABLE_LIBXML2=OFF                       \
     -DCLANG_ENABLE_STATIC_ANALYZER=OFF              \
     -DCLANG_ENABLE_ARCMT=OFF                        \
     -DCLANG_ENABLE_BOOTSTRAP=OFF                    \
-    -DCMAKE_CXX_FLAGS="-Dwait4=__syscall_wait4"
+    -DCMAKE_CXX_FLAGS="-Dwait4=__syscall_wait4 -fexceptions"
 
 # Build step
 emmake make -j4
@@ -35,4 +38,4 @@ emmake make -j4
 emmake make install
 
 # Copy all files with ".wasm" extension to $PREFIX/bin
-cp $SRC_DIR/build/bin/*.wasm $PREFIX/bin
+cp $SRC_DIR/build/bin/*.wasm $PREFIX/bin

recipes/recipes_emscripten/llvm/patches/shift_temporary_files_to_tmp_dir.patch

@@ -1,5 +1,5 @@
 diff --git a/clang/lib/Interpreter/Wasm.cpp b/clang/lib/Interpreter/Wasm.cpp
-index aa10b160ccf8..184867e2b55f 100644
+index aa10b160ccf8..55c3323e31f5 100644
 --- a/clang/lib/Interpreter/Wasm.cpp
 +++ b/clang/lib/Interpreter/Wasm.cpp
 @@ -76,8 +76,8 @@ llvm::Error WasmIncrementalExecutor::addModule(PartialTranslationUnit &PTU) {
@@ -13,3 +13,19 @@ index aa10b160ccf8..184867e2b55f 100644
 
    std::error_code Error;
    llvm::raw_fd_ostream ObjectFileOutput(llvm::StringRef(ObjectFileName), Error);
+@@ -99,10 +99,15 @@ llvm::Error WasmIncrementalExecutor::addModule(PartialTranslationUnit &PTU) {
+
+   std::vector<const char *> LinkerArgs = {"wasm-ld",
+                                           "-shared",
++                                          "--allow-multiple-definition",
+                                           "--import-memory",
+                                           "--experimental-pic",
+                                           "--stack-first",
+                                           "--allow-undefined",
++                                          "--demangle",
++                                          "--no-gc-sections",
++                                          "--export-all",
++                                          "--export-dynamic",
+                                           ObjectFileName.c_str(),
+                                           "-o",
+                                           BinaryFileName.c_str()};

recipes/recipes_emscripten/llvm/recipe.yaml

@@ -14,7 +14,7 @@ source:
   - patches/shift_temporary_files_to_tmp_dir.patch
 
 build:
-  number: 0
+  number: 1
 
 requirements:
   build: