fix selective build validation and dtype build plumbing

examples/selective_build/test_selective_build.sh

@@ -150,7 +150,7 @@ test_cmake_select_ops_in_model() {
     # the .pte via gen_selected_max_kernel_num().
     retry cmake -DCMAKE_BUILD_TYPE="$CMAKE_BUILD_TYPE" \
             -DEXECUTORCH_SELECT_OPS_MODEL="./${model_export_name}" \
-            -DEXECUTORCH_DTYPE_SELECTIVE_BUILD=ON \
+            -DEXECUTORCH_ENABLE_DTYPE_SELECTIVE_BUILD=ON \
             -DEXECUTORCH_OPTIMIZE_SIZE=ON \
             -DCMAKE_INSTALL_PREFIX=cmake-out \
             -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
@@ -171,6 +171,58 @@ test_cmake_select_ops_in_model() {
       || { echo "ERROR: header missing expected define"; exit 1; }
     echo "Generated: $(cat ${generated_header} | tail -1)"
 
+    echo "Verifying dtype-selective variant header was generated"
+    local generated_variant_header
+    generated_variant_header=$(find "${build_dir}" -name selected_op_variants.h -print -quit)
+    if [[ -z "${generated_variant_header}" ]]; then
+      echo "ERROR: selected_op_variants.h not generated"
+      exit 1
+    fi
+
+    echo 'Running selective build test'
+    ${build_dir}/selective_build_test --model_path="./${model_export_name}"
+
+    echo "Removing ${model_export_name}"
+    rm "./${model_export_name}"
+}
+
+test_cmake_select_ops_in_model_and_list() {
+    local model_name="add_mul"
+    local model_export_name="${model_name}.pte"
+    echo "Exporting ${model_name}"
+    ${PYTHON_EXECUTABLE} -m examples.portable.scripts.export --model_name="${model_name}"
+    local example_dir=examples/selective_build/basic
+    local build_dir=cmake-out/${example_dir}_combined
+    rm -rf ${build_dir}
+    retry cmake -DCMAKE_BUILD_TYPE="$CMAKE_BUILD_TYPE" \
+            -DEXECUTORCH_SELECT_OPS_MODEL="./${model_export_name}" \
+            -DEXECUTORCH_SELECT_OPS_LIST="aten::relu.out" \
+            -DCMAKE_INSTALL_PREFIX=cmake-out \
+            -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" \
+            -B${build_dir} \
+            ${example_dir}
+
+    echo "Building ${example_dir} with model and list selectors"
+    cmake --build ${build_dir} -j9 --config $CMAKE_BUILD_TYPE
+
+    echo "Verifying merged selected_operators.yaml contains both selector inputs"
+    local selected_operators_yaml=${build_dir}/executorch/executorch_selected_kernels/selected_operators.yaml
+    if [[ ! -f "${selected_operators_yaml}" ]]; then
+      echo "ERROR: selected_operators.yaml not generated"
+      exit 1
+    fi
+    ${PYTHON_EXECUTABLE} - <<PY
+import yaml
+
+with open("${selected_operators_yaml}") as f:
+    ops = set(yaml.safe_load(f)["operators"].keys())
+
+expected = {"aten::add.out", "aten::mm.out", "aten::relu.out"}
+missing = expected - ops
+if missing:
+    raise RuntimeError(f"Missing merged ops: {sorted(missing)}")
+PY
+
     echo 'Running selective build test'
     ${build_dir}/selective_build_test --model_path="./${model_export_name}"
 
@@ -199,6 +251,7 @@ then
     test_cmake_select_ops_in_list
     test_cmake_select_ops_in_yaml
     test_cmake_select_ops_in_model
+    test_cmake_select_ops_in_model_and_list
 elif [[ $1 == "buck2" ]];
 then
     test_buck2_select_all_ops

tools/cmake/Codegen.cmake

@@ -355,6 +355,12 @@ function(gen_operators_lib)
           selected_portable_kernels PRIVATE EXECUTORCH_SELECTIVE_BUILD_DTYPE=1
         )
 
+        install(
+          TARGETS selected_kernels_util_all_deps selected_portable_kernels
+          EXPORT ExecuTorchTargets
+          DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        )
+
         target_link_libraries(${GEN_LIB_NAME} PUBLIC selected_portable_kernels)
       else()
         message(

tools/cmake/common/preset.cmake

@@ -117,12 +117,75 @@ macro(load_build_preset)
 endmacro()
 
 # Check if the required options are set.
+function(is_option_enabled NAME OUT_VAR)
+  if(NOT DEFINED ${NAME} AND NOT DEFINED CACHE{${NAME}})
+    set(${OUT_VAR}
+        FALSE
+        PARENT_SCOPE
+    )
+    return()
+  endif()
+
+  get_property(
+    _option_type_set
+    CACHE ${NAME}
+    PROPERTY TYPE
+    SET
+  )
+  if(_option_type_set)
+    get_property(
+      _option_type
+      CACHE ${NAME}
+      PROPERTY TYPE
+    )
+    if("${_option_type}" STREQUAL "BOOL")
+      if(${NAME})
+        set(${OUT_VAR}
+            TRUE
+            PARENT_SCOPE
+        )
+      else()
+        set(${OUT_VAR}
+            FALSE
+            PARENT_SCOPE
+        )
+      endif()
+    else()
+      if(NOT "${${NAME}}" STREQUAL "")
+        set(${OUT_VAR}
+            TRUE
+            PARENT_SCOPE
+        )
+      else()
+        set(${OUT_VAR}
+            FALSE
+            PARENT_SCOPE
+        )
+      endif()
+    endif()
+  else()
+    if("${${NAME}}")
+      set(${OUT_VAR}
+          TRUE
+          PARENT_SCOPE
+      )
+    else()
+      set(${OUT_VAR}
+          FALSE
+          PARENT_SCOPE
+      )
+    endif()
+  endif()
+endfunction()
+
 function(check_required_options_on)
   cmake_parse_arguments(ARG "" "IF_ON" "REQUIRES" ${ARGN})
 
-  if(${${ARG_IF_ON}})
+  is_option_enabled(${ARG_IF_ON} _if_on)
+  if(_if_on)
     foreach(required ${ARG_REQUIRES})
-      if(NOT ${${required}})
+      is_option_enabled(${required} _required_on)
+      if(NOT _required_on)
         message(FATAL_ERROR "Use of '${ARG_IF_ON}' requires '${required}'")
       endif()
     endforeach()
@@ -133,9 +196,11 @@ endfunction()
 function(check_conflicting_options_on)
   cmake_parse_arguments(ARG "" "IF_ON" "CONFLICTS_WITH" ${ARGN})
 
-  if(${${ARG_IF_ON}})
+  is_option_enabled(${ARG_IF_ON} _if_on)
+  if(_if_on)
     foreach(conflict ${ARG_CONFLICTS_WITH})
-      if(${${conflict}})
+      is_option_enabled(${conflict} _conflict_on)
+      if(_conflict_on)
         message(FATAL_ERROR "Both '${ARG_IF_ON}' and '${conflict}' can't be ON")
       endif()
     endforeach()

tools/cmake/preset/default.cmake

@@ -423,15 +423,9 @@ check_conflicting_options_on(
   EXECUTORCH_BUILD_PTHREADPOOL EXECUTORCH_BUILD_CPUINFO
 )
 
-# Selective build specifiers are mutually exclusive.
-check_conflicting_options_on(
-  IF_ON EXECUTORCH_SELECT_OPS_YAML CONFLICTS_WITH EXECUTORCH_SELECT_OPS_LIST
-  EXECUTORCH_SELECT_OPS_MODEL
-)
-
-check_conflicting_options_on(
-  IF_ON EXECUTORCH_SELECT_OPS_LIST CONFLICTS_WITH EXECUTORCH_SELECT_OPS_MODEL
-)
+# Legacy selective build selectors are intentionally allowed to compose.
+# This matches gen_oplist.py, which merges list, YAML, and model inputs into
+# one selected_operators.yaml file.
 
 check_required_options_on(
   IF_ON EXECUTORCH_BUILD_WASM REQUIRES EXECUTORCH_BUILD_EXTENSION_MODULE