Run selective build CI test with more restrictions

Revert reason for #14487 was that internal tests were running with "-Werror,-Wunused-variable" option but not OSS tests

Author: mergennachin

codegen/tools/CMakeLists.txt

@@ -24,8 +24,17 @@ target_include_directories(
 
 # Compile options
 target_compile_options(
-  selective_build PUBLIC -Wno-deprecated-declarations -fPIC -frtti -fexceptions
+  selective_build
+  PUBLIC -Wno-deprecated-declarations
+         -fPIC
+         -frtti
+         -fexceptions
+         -Werror
+         -Wunused-variable
+         -Wno-unknown-argument
 )
+# We suppress -Wno-unknown-argument because our build system passes -fPIC for
+# Unix builds, but we also build on Windows where it's ignored
 
 # Link against required libraries
 target_link_libraries(selective_build PRIVATE executorch_core program_schema)

examples/selective_build/test_selective_build.sh

@@ -183,6 +183,15 @@ fi
 if [[ $1 == "cmake" ]];
 then
     cmake_install_executorch_lib $CMAKE_BUILD_TYPE
+
+    # Build selective_build module for model-based selection
+    echo "Building selective_build Python module..."
+    cmake -DEXECUTORCH_BUILD_PYBIND=ON \
+        -DCMAKE_BUILD_TYPE=$CMAKE_BUILD_TYPE \
+        -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
+        -Bcmake-out .
+    cmake --build cmake-out --target selective_build -j9
+
     test_cmake_select_ops_in_list
     test_cmake_select_ops_in_yaml
     test_cmake_select_ops_in_model