Disable the MLIR ExecutionEngine library when the native target is not configured

The execution engine would not be functional anyway, we're already
disabling the tests, this also disable the rest of the code.

Anecdotally this reduces the number of static library built when the
builtin target is disabled goes from 236 to 218.

Here is the complete list of LLVM targets built when running
`ninja check-mlir`:

libLLVMAggressiveInstCombine.a
libLLVMAnalysis.a
libLLVMAsmParser.a
libLLVMBinaryFormat.a
libLLVMBitReader.a
libLLVMBitstreamReader.a
libLLVMBitWriter.a
libLLVMCore.a
libLLVMDebugInfoCodeView.a
libLLVMDebugInfoDWARF.a
libLLVMDemangle.a
libLLVMFileCheck.a
libLLVMFrontendOpenMP.a
libLLVMInstCombine.a
libLLVMIRReader.a
libLLVMMC.a
libLLVMMCParser.a
libLLVMObject.a
libLLVMProfileData.a
libLLVMRemarks.a
libLLVMScalarOpts.a
libLLVMSupport.a
libLLVMTableGen.a
libLLVMTableGenGlobalISel.a
libLLVMTextAPI.a
libLLVMTransformUtils.a

Differential Revision: https://reviews.llvm.org/D117287

Author: joker-eph

mlir/lib/CAPI/CMakeLists.txt

@@ -10,12 +10,16 @@ endfunction()
 add_subdirectory(Debug)
 add_subdirectory(Dialect)
 add_subdirectory(Conversion)
-add_subdirectory(ExecutionEngine)
 add_subdirectory(Interfaces)
 add_subdirectory(IR)
 add_subdirectory(Registration)
 add_subdirectory(Transforms)
 
+# Only enable the ExecutionEngine if the native target is configured in.
+if(TARGET ${LLVM_NATIVE_ARCH})
+  add_subdirectory(ExecutionEngine)
+endif()
+
 # Build the optional CAPI dylib.
 if(MLIR_BUILD_MLIR_C_DYLIB)
   message(STATUS "Building MLIR-C dylib")
@@ -33,3 +37,4 @@ if(MLIR_BUILD_MLIR_C_DYLIB)
     endif()
   endif()
 endif()
+

mlir/lib/CMakeLists.txt

@@ -4,7 +4,6 @@ add_flag_if_supported("-Werror=global-constructors" WERROR_GLOBAL_CONSTRUCTOR)
 add_subdirectory(Analysis)
 add_subdirectory(Conversion)
 add_subdirectory(Dialect)
-add_subdirectory(ExecutionEngine)
 add_subdirectory(IR)
 add_subdirectory(Interfaces)
 add_subdirectory(Parser)
@@ -17,3 +16,8 @@ add_subdirectory(Target)
 add_subdirectory(Tools)
 add_subdirectory(Transforms)
 add_subdirectory(Translation)
+
+# Only enable the ExecutionEngine if the native target is configured in.
+if(TARGET ${LLVM_NATIVE_ARCH})
+  add_subdirectory(ExecutionEngine)
+endif()

mlir/python/CMakeLists.txt

@@ -292,17 +292,20 @@ declare_mlir_python_extension(MLIRPythonExtension.Conversions
   MLIRCAPIConversion
 )
 
-declare_mlir_python_extension(MLIRPythonExtension.ExecutionEngine
-  MODULE_NAME _mlirExecutionEngine
-  ADD_TO_PARENT MLIRPythonSources.ExecutionEngine
-  ROOT_DIR "${PYTHON_SOURCE_DIR}"
-  SOURCES
-    ExecutionEngineModule.cpp
-  PRIVATE_LINK_LIBS
-    LLVMSupport
-  EMBED_CAPI_LINK_LIBS
-    MLIRCAPIExecutionEngine
-)
+# Only enable the ExecutionEngine if the native target is configured in.
+if(TARGET ${LLVM_NATIVE_ARCH})
+  declare_mlir_python_extension(MLIRPythonExtension.ExecutionEngine
+    MODULE_NAME _mlirExecutionEngine
+    ADD_TO_PARENT MLIRPythonSources.ExecutionEngine
+    ROOT_DIR "${PYTHON_SOURCE_DIR}"
+    SOURCES
+      ExecutionEngineModule.cpp
+    PRIVATE_LINK_LIBS
+      LLVMSupport
+    EMBED_CAPI_LINK_LIBS
+      MLIRCAPIExecutionEngine
+  )
+endif()
 
 declare_mlir_python_extension(MLIRPythonExtension.GPUDialectPasses
   MODULE_NAME _mlirGPUPasses

mlir/test/CAPI/CMakeLists.txt

@@ -19,13 +19,16 @@ function(_add_capi_test_executable name)
   endif()
 endfunction(_add_capi_test_executable)
 
-_add_capi_test_executable(mlir-capi-execution-engine-test
-  execution_engine.c
-LINK_LIBS PRIVATE
-  MLIRCAPIConversion
-  MLIRCAPIExecutionEngine
-  MLIRCAPIRegistration
-)
+# Only enable the ExecutionEngine if the native target is configured in.
+if(TARGET ${LLVM_NATIVE_ARCH})
+  _add_capi_test_executable(mlir-capi-execution-engine-test
+    execution_engine.c
+  LINK_LIBS PRIVATE
+    MLIRCAPIConversion
+    MLIRCAPIExecutionEngine
+    MLIRCAPIRegistration
+  )
+endif()
 
 _add_capi_test_executable(mlir-capi-ir-test
   ir.c

mlir/test/CMakeLists.txt

@@ -75,7 +75,6 @@ configure_lit_site_cfg(
 
 set(MLIR_TEST_DEPENDS
   FileCheck count not split-file
-  mlir-capi-execution-engine-test
   mlir-capi-ir-test
   mlir-capi-llvm-test
   mlir-capi-pass-test
@@ -89,9 +88,6 @@ set(MLIR_TEST_DEPENDS
   mlir-reduce
   mlir-tblgen
   mlir-translate
-  mlir_runner_utils
-  mlir_c_runner_utils
-  mlir_async_runtime
   )
 
 # The native target may not be enabled, in this case we won't
@@ -101,6 +97,10 @@ if(TARGET ${LLVM_NATIVE_ARCH})
   list(APPEND MLIR_TEST_DEPENDS
     mlir-cpu-runner
     llc
+    mlir_async_runtime
+    mlir-capi-execution-engine-test
+    mlir_c_runner_utils
+    mlir_runner_utils
   )
 endif()