CMake: Non-working code for auto-building the native tblgen util when
cross-compiling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58950 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/CrossCompileLLVM.cmake b/cmake/modules/CrossCompileLLVM.cmake
index 0377c05..36ae306 100644
--- a/cmake/modules/CrossCompileLLVM.cmake
+++ b/cmake/modules/CrossCompileLLVM.cmake
@@ -1,6 +1,42 @@
-# TODO: Build a native tblgen when cross-compiling, if the user
-# didn't set LLVM_TABLEGEN. Then, remove this check:
-if( CMAKE_CROSSCOMPILING AND ${LLVM_TABLEGEN} STREQUAL "tblgen" )
+
+if( ${LLVM_TABLEGEN} STREQUAL "tblgen" )
+ # TODO: remove this when autobuilding the native tblgen works.
message(FATAL_ERROR
"Set LLVM_TABLEGEN to the full route to a native tblgen executable")
+
+ message(STATUS "Configuring native TableGen...")
+ set(CX_NATIVE_TG_DIR "${CMAKE_BINARY_DIR}/native")
+
+ execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${CX_NATIVE_TG_DIR}
+ RESULT_VARIABLE CX_NATIVE_TG_RV)
+ if( NOT CX_NATIVE_TG_RV EQUAL 0 )
+ message(FATAL_ERROR "Failed to create directory ${CX_NATIVE_TG_DIR}")
+ endif()
+
+ execute_process(
+ COMMAND ${CMAKE_COMMAND} -UMAKE_TOOLCHAIN_FILE -DCMAKE_BUILD_TYPE=Release ${CMAKE_SOURCE_DIR}
+ WORKING_DIRECTORY ${CX_NATIVE_TG_DIR}
+ RESULT_VARIABLE CX_NATIVE_TG_RV
+ ERROR_VARIABLE CX_NATIVE_TG_ERROR)
+ if( NOT CX_NATIVE_TG_RV EQUAL 0 )
+ message(FATAL_ERROR
+ "Error while configuring native TableGen:\n${CX_NATIVE_TG_ERROR}")
+ endif()
+
+ message(STATUS "Native TableGen configured.")
+
+ set(LLVM_TABLEGEN "${CX_NATIVE_TG_DIR}/bin/tblgen")
+
+ add_custom_command(OUTPUT ${LLVM_TABLEGEN}
+ COMMAND ${CMAKE_BUILD_TOOL} -C ${CX_NATIVE_TG_DIR}/utils/TableGen
+ COMMENT "Building native TableGen...")
+ add_custom_target(NativeTableGen DEPENDS ${LLVM_TABLEGEN})
+ add_dependencies(tblgen NativeTableGen)
+
+ # TODO: We should clean the native build when the `clean target
+ # is invoked. This doesn't work.
+# add_custom_command(TARGET clean
+# COMMAND ${CMAKE_BUILD_TOOL} -C ${CX_NATIVE_TG_DIR}/utils/TableGen clean
+# POST_BUILD
+# COMMENT "Cleaning native TableGen...")
endif()