fix: resolve C++ component compilation and file operations issues

- Fix file_ops_actions.bzl to properly copy source files to workspace directory
- Resolve C++ compilation issue by using clang instead of clang++ for WebAssembly
- Add dependency library linking support for C++ components
- Both C and C++ components now build successfully with proper file operations

Fixes #21: C++ component file operations and compilation failures

Author: avrabe

.github/workflows/ci.yml

@@ -100,7 +100,6 @@ jobs:
           bazel build -- //... \
             -//examples/world_export/... \
             -//examples/multi_profile/... \
-            -//examples/cpp_component/... \
             -//examples/js_component/... \
             -//examples/wac_remote_compose/... \
             -//examples/wac_oci_composition/... \
@@ -199,7 +198,6 @@ jobs:
           bazel build -- //... \
             -//examples/world_export/... \
             -//examples/multi_profile/... \
-            -//examples/cpp_component/... \
             -//examples/js_component/... \
             -//examples/wac_remote_compose/... \
             -//examples/wac_oci_composition/... \

cpp/defs.bzl

@@ -9,7 +9,8 @@ def _cpp_component_impl(ctx):
 
     # Get C/C++ toolchain
     cpp_toolchain = ctx.toolchains["@rules_wasm_component//toolchains:cpp_component_toolchain_type"]
-    clang = cpp_toolchain.clang if ctx.attr.language == "c" else cpp_toolchain.clang_cpp
+    # Use clang for both C and C++ compilation to avoid clang++ preprocessor issues
+    clang = cpp_toolchain.clang  # if ctx.attr.language == "c" else cpp_toolchain.clang_cpp
     wit_bindgen = cpp_toolchain.wit_bindgen
     wasm_tools = cpp_toolchain.wasm_tools
     sysroot = cpp_toolchain.sysroot
@@ -130,10 +131,14 @@ def _cpp_component_impl(ctx):
     for src in sources:
         compile_args.add(work_dir.path + "/" + src.basename)
 
+    # Add dependency libraries for linking
+    for lib in dep_libraries:
+        compile_args.add(lib.path)
+
     ctx.actions.run(
         executable = clang,
         arguments = [compile_args],
-        inputs = [work_dir, sysroot],
+        inputs = [work_dir, sysroot] + dep_libraries,
         outputs = [wasm_binary],
         mnemonic = "CompileCppWasm",
         progress_message = "Compiling C/C++ to WASM for %s" % ctx.label,

tools/bazel_helpers/file_ops_actions.bzl

@@ -182,11 +182,36 @@ def prepare_workspace_action(ctx, config):
     # For now, use a simple approach: just create the directory and copy files directly
     # This avoids the complex JSON parsing issues while still providing the functionality
 
-    # Create the workspace directory
-    ctx.actions.run(
-        executable = file_ops_component,
-        arguments = ["create_directory", "--path", workspace_dir.path],
-        inputs = [],
+    # Create workspace directory and copy all files in a single action
+    # Collect all input files
+    all_inputs = []
+    commands = ["mkdir -p {}".format(workspace_dir.path)]
+    
+    # Add sources
+    for source_info in config.get("sources", []):
+        src_file = source_info["source"]
+        dest_name = source_info.get("destination") or src_file.basename
+        all_inputs.append(src_file)
+        commands.append("cp {} {}/{}".format(src_file.path, workspace_dir.path, dest_name))
+    
+    # Add headers
+    for header_info in config.get("headers", []):
+        hdr_file = header_info["source"]
+        dest_name = header_info.get("destination") or hdr_file.basename
+        all_inputs.append(hdr_file)
+        commands.append("cp {} {}/{}".format(hdr_file.path, workspace_dir.path, dest_name))
+    
+    # Add dependencies
+    for dep_info in config.get("dependencies", []):
+        dep_file = dep_info["source"]
+        dest_name = dep_info.get("destination") or dep_file.basename
+        all_inputs.append(dep_file)
+        commands.append("cp {} {}/{}".format(dep_file.path, workspace_dir.path, dest_name))
+    
+    # Execute workspace preparation in single action
+    ctx.actions.run_shell(
+        command = " && ".join(commands),
+        inputs = all_inputs,
         outputs = [workspace_dir],
         mnemonic = "PrepareWorkspace",
         progress_message = "Preparing {} workspace for {}".format(